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9 Buffalo WIld WIngs 04-34 904 University Dr E
DRAINAGE COMPUTATIONS For Buffalo Wild Wings Bryan, Braws County, Texas Prepared tor Charles Stone c/o C-J STONE, INC. P.O . Box 628/ 717 Ave.B Somerville, TX 77879 Tel : (979) 255-5180 Fax: (979) 596-1285 Prepared bv: Garrett Engineering 4444 Carter Creek Parkway -Suite 108 Bryan , Texas 77802 Telephone: (979) 846-2688 *MAY, 2004 * Garrett Engineering · 4444 carter Creel< Parl<way Suite 108 · Bryan, Texas 77802 • Telephone: (979) 846-2688 · Fax: (979) 846·3094 · Page I SUBJECT PROPERTY DRAINAGE SUMMARY for Buffalo Wild Wings College Station, Brazos County, Texas *May, 2004 * SUMMARY The subject property is located at 903 University Drive East, Replat University Park- Phase II, Block V, Lots 3CR, College Station, Texas and contains 1.38 acres. Project Overview Currently the land is vacant with an access drive 21 feet wide and 236 feet long. See Survey. The developer is proposing a 6000 sq.ft restuarnt facility -Buffalo Wild Wings. This facility will require at least 93 parking spaces and will encompase the entire 1.38 acre lot. Two storm water detention facilities were designed to accept run-off from the 1.38 acre tract. Tributary A includes the two rear parking areas, a portion of the middle parking area (parking area to the east), and the building for 0.70 acres. Tributary B includes the front and side parking areas and greenspace at the front of the property. The storm water detention facility for Tributary A is contained in the rear parking lot behind the building and "metered" thru a raised curb acting as a trapazodial weir. The storm water detention facility for Tributary Bis contained in the green space at the front of the propery. See Exhibit A. Detention Pond A The total tributary A consists of 0.70 acres of which 0.05 acres are impervious cover in the pre-development stage. In the post development state 0.62 acres are impervious area and 0.08 acres are pervious. The 0.70 acre development site has 0.086 acres that are allowed to "free flow". Detention Pond A collects water flowing from 0.617 acres of the development of which 0.591 acres are impervious. See Exhibit B. Computations presented on Page 2 present the estimated pre-development peak discharge rates generated by the 2, 5, 10, 25, 50 and 100-year storm events. The pre-development run-off coefficient was assumed to be 0.50. The post development weighted run-off coefficient was assumed to be 0.91 for the 0.70 acre tributary. Post- development hydrographs calculated on page 2 assume no detention to facilitate direct comparison in the pre-and post-development conditions. Page 3 calculates peak discharge rates for "free-flow" from the project site. The anticipated "free-flow" is 0.086 acres and having a weighted run-off coefficient of 0.66. Page 4 computes peak discharge rates for the storm water that is directed to the proposed detention pond. Pages 5-12 present tabulations for the predevelopment, post-development with no detention, "free-flow" and flow to detention pond hydrographs respectively. Pages 13-15 are hydrographs for the pre-development, post- development with no detention, "free-flow" and flow to detention pond hydrographs respectively. A minimum time of concentration (T/c) of 10 minutes is taken because it is greater than the actual T / c computed as 1.45 minutes. The calculations for t/ c are on Page 1. Having derived the Preliminary volume requirements as presented on page 2 and "allowable peak" discharge rate as present on page 1 it is now possible to design the final detention facility and outlet control structure. Page 16 presents a tabulation and depth verses volume graph for the detention facility as proposed. The top of curb is the maximum elevation for the detention pond and is at elevation 314.25. In the 100-year strom event the elevation in the pond is 314.25 and at 99% capacity, not leaving room for "free-board". Page 17 presents a tabulation and rating curve for the proposed outlet control structure. A trapazodial weir was chosen due to the discharge ratio characteristics associated with the anticipated headwater depth. An ultimate storage depth of 9 inches or 0.75 feet is available due to the physical geometry of the pond. The flows from the trapezoidal weir were determined from the following equation, Q=Cw*(L+0.8*H*tan(0/2)]*Hb. Where "Q" is the design discharge rate in cubic feet per second. "Cw" is the weir coefficient (2.9 for trapezoidal weir. "L" crest length in feet(L=l 1-1/2"or 0.96 feet). "H" is the headwater depth in feet on the weir to the crest which ranges from 0.00 ft. to a maximum of 0.75 ft. "0" is the internal angle in radians. And "b" is a constant at 1.5. Page 18 presents a tabulation of the relationship between discharge from the detention and the dimensionless quantity 2S/t-0. Also included is the Storage Indication Curve for the proposed detention facility based on the aforementioned physical characteristics of the detention pond, storage volume, inflow hydrographs, and rating curve for the outlet structure. The storage indication curve as shown on page presented as follows: 18 is a graphical solution to the equation 2s1 (II+ 12) + (-- - - - - - - - - - dt 2s2 -0 1) = (-- --- --- - -- dt Pages 20-22, 23-25, 26-28, 29-31, 32-34, and 35-37 present simulations for the 2, 5, 10, 25, 50 and 100-year storm events. The first and second pages of each storm frequency simulation represent the tabulated data for the storm event. The third page of each storm simulation represents the pre-development hydrograph, the post-development hydrograph (with no detention), and the post development "free-flow" hydrograph for each storm event. Pages 37 -42 provide total inflow/outflow hydrographs for the 2, 5, 10, 25, 50 and 100-year pre-development and post-development storm events. It can be determined from these same hydrographs that the post-development peak discharge rates have been significantly reduced from those peak pre-development discharge rates due to the incorporation of the proposed detention facility. Page 43 is a graph that summates the depths, volumes, and percent of "utilized" storage volumes for the 2, 5, 10, 25, 50 and 100-year storm events. 2 Detention Pond B The total tributary A consists of 0.674 acres of which 0.076 acres are impetvious cover in the pre-development stage. In the post development state 0.584 acres are impetvious area and 0.128 acres are petvious. The 0.674 acre development site has 0.109 acres that are allowed to "free flow". Detention Pond B collects water flowing from 0.565 acres of the development of which 0.44 7 acres are impetvious. See Exhibit C. Computations presented on Page 2 present the estimated pre-development peak discharge rates generated by the 2, 5, 10, 25, 50 and 100-year storm events. The pre-development run-off coefficient was assumed to be 0.53. The post development weighted run-off coefficient was assumed to be 0.88 for the 0.674 acre tributary. Post- development hydrographs calculated on page 2 assume no detention to facilitate direct comparison in the pre-and post-development conditions. Page 3 calculates peak discharge rates for "free-flow" from the project site. The anticipated "free-flow" is 0.109 acres and having a weighted run-off coefficient of 0.93. Page 4 computes peak discharge rates for the storm water that is directed to the proposed detention pond. Pages 5-12 present tabulations for the predevelopment, post-development with no detention, "free-flow" and flow to detention pond hydrographs respectively. Pages 13-15 are hydrographs for the pre-development, post- development with no detention, "free-flow" and flow to detention pond hydrographs respectively. A minimum time of concentration (T/c) of 10 minutes is taken because it is greater than the actual T / c computed as 3.4 7 minutes. The calculations for t/ c are on Page 1. Having derived the Preliminary volume requirements as presented on page 2 and "allowable peak" discharge rate as present on page 1 it is now possible to design the final detention facility and outlet control structure. Page 16 presents a tabulation and depth verses volume graph for the detention facility as proposed. The top of Berm is at elevation 314.25. In the 100-year strom event the elevation in the pond is 313.85 leaving 0.4 feet or about 4.8 inches of "free-board". Page 17 presents a tabulation and rating curve for the proposed outlet control structure. A circular pipe culvert was chosen due to the discharge ratio characteristics associated with the anticipated headwater depth. An ultimate storage depth of 2.75 is available due to the physical geometry of the pond. The pipe diameter of 8 inches was selected. This value was determined from the following equation for headwater depth (in feet), H=[[ (2.5204 (1 +K) )/04] (466.18n2L (1 +K) ) /D 16/3]] x (D/ 10) 2. "K" is the entrance loss coefficient (K=0.50 for this case). "D" is the diameter of the pipe in feet. "L" is the length of culvert in feet. "Q" is the design discharge rate in cubic feet per second. "n" is Manning's roughness coefficient (n=0.013 for RCP pipe), and "H" is the headwater depth in feet which ranges from 0.00 ft. to a maximum of 2. 75 ft. Page 18 presents a tabulation of the relationship between discharge from the detention and the dimensionless quantity 2S/t-O. Also included is the Storage Indication Curve for the proposed detention facility based on the aforementioned physical characteristics of the detention pond, storage volume, inflow hydrographs, and rating curve for the outlet structure. 3 Page 18 presents a tabulation of the relationship between discharge from the detention and the dimensionless quantity 28/t-0. Also included is the Storage Indication Curve for the proposed detention facility based on the aforementioned physical characteristics of the detention pond, storage volume, inflow hydrographs, and rating curve for the outlet structure. The storage indication curve as shown on page presented as follows: 18 is a graphical solution to the equation 2s1 (II+ 12) + (-- - - - - - - - - - dt 2s2 -0 1) = (-- - - - - - - - - - dt Pages 20-22, 23-25, 26-28, 29-31, 32-34, and 35-37 present simulations for the 2, 5, 10, 25, 50 and 100-year storm events. The first and second pages of each storm frequency simulation represent the tabulated data for the storm event. The third page of each storm simulation represents the pre-development hydrograph, the post-development hydrograph (with no detention), and the post development "free-flow" hydrograph for each storm event. Pages 37 -42 provide total inflow/outflow hydrographs for the 2, 5, 10, 25, 50 and 100-year pre-development and post-development storm events. It can be determined from these same hydrographs that the post-development peak discharge rates have been significantly reduced from those peak pre-development discharge rates due to the incorporation of the proposed detention facility. Page 43 is a graph that summates the depths, volumes, and percent of "utilized" storage volumes for the 2, 5, 10, 25, 50 and 100-year storm events. Findings: The construction of the proposed detention facilities will minimize the effects of this development on the downstream property owners and will decrease the peak discharge rates for the range of storm events of interest within this report. 4 Determine Total Pre-Development Peak Storm Water Discharge Rates Tributary Area ("A"): 0 .674 Pervious Area: Impervious Area: Run-Off Coefficient ("Cwt"): Time Of Concentration ("T /c"): Woodlands: Pastures: Pavements: Hourly Intensity Rates ("I"): Peak Discharge Rate ("Q"): Acres 0.598 0.076 Acres Acres 0.53 10.00 Low Elevation: High Elevation: Distance (Feet): Slope(% Grade): Velocity ("Vw"): Time: Low Elevation: High Elevation: Distance (Feet): Slope (% Grade): Velocity ("Vp"): Time: Low Elevation: High Elevation: Distance (Feet): Slope (% Grade): Velocity ("Vpave"): Time: TotalTravel Time: Use Min. Travel Time: 2-Year: 6.33 5-Year: 7.69 IO-Year: 8.63 25-Year: 9.86 50 -Year: 11.15 100-Year: 11.64 2-Year: 2.25 5-Year: 2.73 IO-Year: 3.06 25-Year: 3.50 50-Year: 3.96 100-Year: 4.13 C= 0.47 c = 0.97 313.00 319.00 250.00 2.40 1.20 Feet I Second 3.47 Minutes 0.00 0.00 0.00 0.00 0.00 Feet I Second 0.00 Minutes 0.00 0.00 0.00 0.00 0.00 Feet I Second 0.00 Minutes 3.47 10.00 Minutes Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Gam>tt Engineering · 4444 Carter Creek Parl<way Suite 108 . Bryan. Texas 77802 . Telephone : (979) 846-2688 . Fax: (979) 846-3094 . Page 1 Determine Post-development Peak Storm Water Discharge (No Detention) Tributary Area ("A"): 0.674 Pervious Area: Impervious Area: Run-Off Coefficient ("Cwt"): Acres 0.88 0.128 0.548 Acres Acres Time Of Concentration ("T /c"): 10.00 Minutes Hourly Intensity Rates ("I"): 2-Year: 5-Year: 10-Year: 25-Year: 50-Year: 100-Year: Peak Discharge Rate ("Q"): 2-Year: 5-Year: 10-Year: 25-Year: 50-Year: 100-Year: Comparison Of Predevelopment And Post-development Peak Discharge Rates 6.33 7.69 8.63 9.86 11.15 11.64 3.74 4.55 5 .10 5.83 6.59 6.88 C= 0.46 c = 0.97 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Predevelopment Post-Development Increase 2-Year: 5-Year: 10-Year: 25-Year: 50-Year: 100-Year: 2.25 Ft3/sec 2. 73 Ft3/sec 3.06 Ft3/sec 3.50 Ft3/sec 3.96 Ft3/sec 4.13 Ft3/sec Preliminary Determination Of Detention Pond Volume 2-Year: 1.49 Ft3/sec x (30 Min. 5-Year: 1.81 Ft3/sec x (30 Min. 10-Year: 2.04 Ft3/sec x (30 Min. 25-Year: 2.33 Ft3/sec x (30 Min. 50-Year: 2.63 Ft3/sec x (30 Min. 100-Year: 2 .75 Ft3/sec x (30 Min. x 60 Sec. x 60 Sec. x 60 Sec. x 60 Sec. x 60 Sec. x 60 Sec. 3.74 Ft3/sec 4.55 Ft3/sec 5.10 Ft3/sec 5.83 Ft3/sec 6.59 Ft3/sec 6.88 Ft3/sec I 2 )= I 2 )= I 2 )= I 2 )= I 2 )= I 2 )= Time Base (Tb)= 3.00 x T le And Time Of Concentration (T /c) Of 10 Minutes. 1.49 Ft3/sec 1.81 Ft3/sec 2.04 Ft3/sec 2.33 Ft3/sec 2.63 Ft3/sec 2.75 Ft3/sec 1,343 Cubic 1,633 Cubic 1,833 Cubic 2,094 Cubic 2,367 Cubic 2,471 Cubic Garrett Engineenrw · 4444 Carter Creek Par1<way Suite 108 • Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 2 Feet Feet Feet Feet Feet Feet Determine Post-Development "Free-Flow" Peak Storm Water Discharge Tributary Area ("A"): 0.109 Pervious Area: Impervious Area: Run-Off Coefficient ("Cwt"): Acres 0.93 0.008 0.101 Acres Acres Time Of Concentration ("T /c"): 10.00 Minutes (Min .) Hourly Intensity Rates ("J"): 2-Year: 6.33 5-Year: 7 .69 10-Year: 8 .63 25-Year: 9.86 50-Year: 11.15 100-Year: 11.64 Peak Discharge Rate ("Q"): 2-Year: 0 .64 5-Year: 0 .78 10-Year: 0.88 25-Year: 1.00 50-Year: 1.13 100-Year: 1.18 c = 0.47 c = 0.97 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Garrett~~· 4444 carter Creek Parkway Suite 108 • Bryan, Texas 77802 -Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Page 3 Determine Post-Development Flow Into Detention Pond Tributary Area ("A"): 0.565 Pervious Area: Impervious Area: Acres 0.118 0.447 Acres Acres Run-Off Coefficient ("Cwt"): 0 .87 Time Of Concentration ("T /c"): 10.00 Minutes Hourly Intensity Rates ("I"): 2-Year: 6.33 5-Year: 7 .69 10-Year: 8 .63 25 -Year: 9.86 50-Year: 11.15 100-Year: 11.64 Peak Discharge Rate ("Q"): 2 -Year: 3 .10 5-Year: 3.76 10-Year: 4 .22 25-Year : 4.83 50-Year: 5.45 100-Year: 5 .70 C= 0.47 C= 0.97 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Ga rrett Er@ineering · 4444 carter Creek Park#ay Suite 108 · Brya n, Texas 77802. Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 4 Pre-Development Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year ~Minutes2 Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.22 0.27 0.31 0.35 0.40 0.41 2 0.45 0.55 0.61 0.70 0.79 0.83 3 0.67 0.82 0.92 1.05 1.19 1.24 4 0.90 1.09 1.23 1.40 1.58 1.65 5 1.12 1.37 1.53 1.75 1.98 2.07 6 1.35 1.64 1.84 2.10 2.37 2.48 7 1.57 1.91 2.15 2.45 2.77 2.89 8 1.80 2.18 2.45 2.80 3.17 3.30 9 2.02 2.46 2.76 3.15 3.56 3.72 11 2.13 2.59 2.91 3.32 3.76 3.92 12 2.02 2.46 2.76 3.15 3.56 3.72 13 1.91 2.32 2.60 2.97 3.36 3.51 14 1.80 2.18 2.45 2.80 3.17 3.30 15 1.68 2.05 2.30 2.62 2.97 3.10 16 1.57 1.91 2.15 2.45 2.77 2.89 17 1.46 1.77 1.99 2.27 2.57 2.69 18 1.35 1.64 1.84 2.10 2.37 2.48 19 1.23 1.50 1.69 1.92 2.18 2.27 20 1.12 1.37 1.53 1.75 1.98 2.07 21 1.01 1.23 1.38 1.57 1.78 1.86 22 0.90 1.09 1.23 1.40 1.58 1.65 23 0.79 0.96 1.07 1.22 1.38 1.45 24 0.67 0.82 0.92 1.05 1.19 1.24 25 0.56 0.68 0.77 0.87 0.99 1.03 26 0.45 0.55 0.61 0.70 0.79 0.83 27 0.34 0.41 0.46 0.52 0.59 0.62 28 0.22 0.27 0.31 0.35 0.40 0.41 29 0.11 0.14 0.15 0.17 0.20 0.21 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering· 4444 Carter Creek Pa!1<way Suite 108 · Bryan, T"""s 77802 ·Telephone: (979) 846-2688 · Fax: (979) 846-3094 . Page 5 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Gamrtt E~neenna · 4444 carter Creek Parl<way Su~e 108 · Bryan. Texas 77802 · Telephone: (979) 84Q.2688 · Fax: (979) 84Q.~ · Paae 6 Post-Development Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.37 0.45 0.51 0.58 0.66 0.69 2 0.75 0.91 1.02 1.17 1.32 1.38 3 1.12 1.36 1.53 1.75 1.98 2.06 4 1.50 1.82 2.04 2.33 2.63 2.75 5 1.87 2.27 2.55 2.91 3.29 3.44 6 2.24 2.73 3.06 3.50 3.95 4.13 7 2.62 3.18 3.57 4.08 4.61 4.81 8 2.99 3.64 4.08 4.66 5.27 5.50 9 3.36 4.09 4.59 5.24 5.93 6.19 11 3.55 4.32 4.85 5.54 6.26 6.53 12 3.36 4.09 4.59 5.24 5.93 6.19 13 3.18 3.86 4.34 4.95 5.60 5.85 14 2.99 3.64 4.08 4.66 5.27 5.50 15 2.80 3.41 3.83 4.37 4.94 5.16 16 2.62 3.18 3.57 4.08 4.61 4.81 17 2.43 2.95 3.32 3.79 4.28 4.47 18 2.24 2.73 3.06 3.50 3.95 4.13 19 2.06 2.50 2.81 3.20 3.62 3.78 20 1.87 2.27 2.55 2.91 3.29 3.44 21 1.68 2.05 2.30 2.62 2.96 3.09 22 1.50 1.82 2.04 2.33 2.63 2.75 23 1.31 1.59 1.79 2.04 2.31 2.41 24 1.12 1.36 1.53 1.75 1.98 2.06 25 0.93 1.14 1.28 1.46 1.65 1.72 26 0.75 0.91 1.02 1.17 1.32 1.38 27 0.56 0.68 0.77 0.87 0.99 1.03 28 0.37 0.45 0.51 0.58 0.66 0.69 29 0.19 0.23 0.26 0.29 0.33 0.34 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 GarTett E1"41ineering · 4444 Corter Crttk Pamray Suite 108 · Bryan. Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 7 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett E~nMnng. -Carter Cfeelc P•rl<way Suite 108. Bryan, TOXH 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 8 Post-Development "Free-Flow" Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year IO-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.06 0.08 0.09 0.10 0.11 0.12 2 0.13 0.16 0.18 0.20 0.23 0.24 3 0.19 0.23 0.26 0.30 0.34 0.36 4 0.26 0.31 0.35 0.40 0.45 0.47 5 0.32 0.39 0.44 0.50 0.57 0.59 6 0.39 0.47 0.53 0.60 0.68 0.71 7 0.45 0.55 0.62 0.70 0.79 0.83 8 0.52 0.63 0.70 0.80 0.91 0.95 9 0.58 0.70 0.79 0.90 1.02 1.07 11 0.61 0.74 0.83 0.95 1.08 1.13 12 0.58 0.70 0.79 0.90 1.02 1.07 13 0.55 0.67 0.75 0.85 0.96 1.01 14 0.52 0.63 0.70 0.80 0.91 0.95 15 0.48 0.59 0.66 0.75 0.85 0.89 16 0.45 0.55 0.62 0.70 0.79 0.83 17 0.42 0.51 0.57 0.65 0.74 0.77 18 0.39 0.47 0.53 0.60 0.68 0.71 19 0.35 0.43 0.48 0.55 0.62 0.65 20 0.32 0.39 0.44 0.50 0.57 0.59 21 0.29 0.35 0.40 0.45 0.51 0.53 22 0.26 0.31 0.35 0.40 0.45 0.47 23 0.23 0.27 0.31 0.35 0.40 0.41 24 0.19 0.23 0.26 0.30 0.34 0.36 25 0.16 0.20 0.22 0.25 0.28 0.30 26 0.13 0.16 0.18 0.20 0.23 0.24 27 0.10 0.12 0.13 0.15 0.17 0.18 28 0.06 0.08 0.09 0.10 0.11 0.12 29 0.03 0.04 0.04 0.05 0.06 0.06 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Ergineen111 · 4444 Corter Creek Par1<way Suite 108 · 8ryan, Texas n002 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 -Page 9 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Gamrtt E~ineeri1"41 • 4444 carter Cleek Parl<way Suite 108 · Biyan, Texas 778C2 . Telephone: (979) 846-2688 • Fax: (979) 846-3094 • Page 10 Post-Development Flow Routed Through Detention Pond Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year IO-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.31 0.38 0.42 0.48 0.55 0.57 2 0.62 0.75 0.84 0.97 1.09 1.14 3 0.93 1.13 1.27 1.45 1.64 1.71 4 1.24 1.51 1.69 1.93 2.18 2.28 5 1.55 1.88 2.11 2.41 2.73 2.85 6 1.86 2.26 2.53 2.90 3.27 3.42 7 2.17 2.63 2.96 3.38 3.82 3.99 8 2.48 3.01 3.38 3.86 4.36 4.56 9 2.79 3.39 3.80 4.34 4.91 5.13 11 2.94 3.58 4.01 4.58 5.18 5.41 12 2.79 3.39 3.80 4.34 4.91 5.13 13 2.63 3.20 3.59 4.10 4.64 4.84 14 2.48 3.01 3.38 3.86 4.36 4.56 15 2.32 2.82 3.17 3.62 4.09 4.27 16 2.17 2.63 2.96 3.38 3.82 3.99 17 2.01 2.45 2.75 3.14 3.55 3.70 18 1.86 2.26 2.53 2.90 3.27 3.42 19 1.70 2.07 2.32 2.65 3.00 3.13 20 1.55 1.88 2.11 2.41 2.73 2.85 21 1.39 1.69 1.90 2.17 2.45 2.56 22 1.24 1.51 1.69 1.93 2.18 2.28 23 1.08 1.32 1.48 1.69 1.91 1.99 24 0.93 1.13 1.27 1.45 1.64 1.71 25 0.77 0.94 1.06 1.21 1.36 1.42 26 0.62 0.75 0.84 0.97 1.09 1.14 27 0.46 0.56 0.63 0.72 0.82 0.85 28 0.31 0.38 0.42 0.48 0.55 0.57 29 0.15 0.19 0.21 0.24 0.27 0.28 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 Garrett E1"4!ineering • 4444 carter Creek Parl<way Surte 108 · Bryan, Teus 77&12 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 -Page 11 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Ellflineenna · 4444 carter Cnoek Parl<way Surte 108 ·Bryan, Texas 77802 ·Telephone: (979) 846-2688 ·Fax: (979) 846-3094 . Page 12 Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 2-Year Storm Event 4.00 -'t:J c 3.50 0 u cu en ... 3 .00 cu ll. 2.50 -cu cu ..... 2 .00 u .c :s 1.50 (.) -cu ~ 1.00 IQ .c u 0.50 Ill 0 0.00 0 10 2 0 30 40 50 60 Ti me (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 5 -Year Storm Event -5.00 't:J § 4 .50 u ~ 4.00 ... :. 3 .50 Q; 3.00 cu ..... u 2 .50 :.0 :s 2.00 (.) ';;' 1.50 b.o ~ 1.00 .c ~ 0 .50 0 0 .00 I '\. I " I " I I ....... '\. I I ............... ' \.. I I ............... " I I ,, '\. II ~'\. I' ~ 0 10 20 30 40 50 60 Time (Minutes) --Pre.Development Hydrograph -Post.Develop ment Outflow Hydrograph Without Detention Garrett ~neeri1"41 • 4444 Carter C....k Parkway Suite 108 • Bryan, Texa• 77802 . Telephone : (979) 846-2688 . Fax: (979) 846-31194 • Page 13 70 70 -"C -"C c 0 u QI (/) ... QI 0.. -QI QI ..... u .Q :J Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 10-Year Storm Event 6.00 5 .00 4 .00 3 .00 ~ 2.00 ~ ... ~ i.00---~~~-+~~~~--+-_,,,..---'~-+~~~~--+-~~~-+~~~~-+-~~~--1 Ill Q 0.00+-------+--------1-------~-------t--------t--------+--------t 0 10 20 30 40 50 60 Time (Minutes) --Pre-Development Hydrograph -Post·Devel op ment Outflow Hydrograph Wi t hou t Dete nti on Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 25-Year Storm Event 70 s 6.oo--~~~~t--~~~-+~~~~-t-~~~~+-~~~-+~~~~--+-~~~---J u QI (/) ... 5.00--~~~-1-+----~~--+~~~~-+-~~~~+-~~~--1~~~~--+-~~~---1 QI 0.. -~ 4.00--~~--1--~+-~~----+~~~~-+-~~~~+-~~~--1~~~~--+-~~~~ ..... u ~ 3.00'1"-~--1~---r--t-~~~~~~~~-+-~~~~+-~~~---j~~~~-t-~~~~ u -~ 2.001"-----;r---or-~t-~~~"-f-~~~~-+-~~~~+-~~~---j~~~~-t-~~~~ ... nJ .c ~ l.00'1"--1-T~~~t-~~~---t~-"<~.--+-~~~~+-~~~---j~~~~-t-~~~~ Q O.OO"f-"-------+--------+--------.--------+--------+-------+------~ 0 10 20 30 40 50 60 70 Time (Minutes) --Pre · Developme nt Hydrograph -Post-Develop ment Outflow Hydrograph Wi t ho ut Detention Garrett Ervi.-rl,. · 4444 Carter Creel< Parl<way Su~e 108 . Bryan . Texos 77802 -Telephone: (979) 846-2688 . Fox: (979) 846-3094 . Page 14 Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 50-Year Storm Event _ 7.oo--~~~-.~~~~-.-~~~-.~~~~---.--~~~--,~~~~---.--~~~-. ~ c 8 6 .00--~~~-1-+~~~~-t-~~~--t~~~~-;-~~~--1~~~~-;-~~~--t Cl) (/) ~ 5.00--~~-1---t~-----"i.----~-t-~~~--t~~~~-;-~~~--1~~~~-;-~~~--t Cl. -~ 4.oo--~~1-------!,~~~----+-~~~-+~~~~-t-~~~--t~~~~-t-~~~--t ..... u ~ 3.oo~~--1--~----1-~-"..-~~~~~-+~~~~-+-~~~-+~~~~-+-~~~-+ :I (.) -Cl) 2.00---1--r-~--t~~~~"'!<-~,-~--t~~~~-;-~~~--1~~~~-;-~~~--t DD ... co ~ 1.00--.r-+-~~----1-~~~~-+-~-----+~~~~-+-~~~-+~~~~-+-~~~-+ Cll Q o.oo .... -------+--------+------...... --------1--------+--------+-------""1 0 10 20 30 40 50 60 Ti me (Minutes) --Pre -Dev elopment Hydrograph -Post-Develop ment Outflow Hydrograph Without Detention Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 100-Year Storm Event 70 ,;-s .oo--~~~--,~~~~-.-~~~~.-~~~----.~~~~-.-~~~--,~~~~~ c 8 7 .00--~~~--1~~~~-+-~~~~+-~~~-+~~~~-+-~~~--1~~~~~ Cl) (/) ... 6.00--~~~-11-i~~-~~-+-~~~~+-~~~-+~~~~-+-~~~--1~~~~~ Cl) Cl. ~ 5.00--~~_,_--1~~-----~-+-~~~~+-~~~-+~~~~-+-~~~--1~~~~~ Cl) ..... u 4 .oo--~--.~------~~-----+-~~~--+-~~~~t--~~~-+-~~~--1~~~----< ~ a 3 .00--~-1--r--+~~-"'oc-~~--~~~+--~~~-t-~~~~-t-~~~-+~~~~~ -~ 2.00---1---~-+~~~~_,..,.~---~~+--~~~-t-~~~~-t-~~~-+~~~~~ ... co ~ 1.00 _,_,_~~~r-~~~--;-~-----"~..--+-~~~---f~~~~-+-~~~~+-~~~----" Cll Q o.oo~-------t--------1--------..--------+--------t------~i--------1 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Devel opm ent Hy d rog rap h -Post-Develo pment Outflow Hyd rograph Wi t hou t Detenti on Garrett Er«i,_rtr« · 4444 carter Creek Pa rkway Su ite 108 · Bryan. Texas 77802 · Tele phone: (979) 846-2668 . Fax: (979) 846-3094 . Page 15 I Detention Pond Depth Vs. Volume --QI QI ..... Elevation 311.50 312.00 312.50 313.00 314.00 314.25 Depth (Feet) 0 .00 0 .50 1.00 1.50 2.50 2.75 Detention Pond Depth Vs. Volume Volume (Ft3) 0 79 497 1117 2657 3067 :;;-1.50--~~~--+-~~~~+----c.r--~~--+-~~~--t~~~~-t-~~~--+-~~~----< -Q, QI c O .OO+-~~~-+~~~~t-~~~-+-~~~--t~~~~+-~~~-+~~~--1 0 500 1000 1500 2000 2500 3000 3500 Detention Pond Volume (Cubic Feet) Garrett Ercineeri111! · 4444 Carter Creek Parkway Suite 108 · Bryan, Texas 7781J2 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 16 Rating Cune For Outlet Control Structure De th Vs. Volume Elevation 311.50 312.00 312.50 313.00 314.00 314.25 Depth (Feet) 0 .00 0 .50 1.00 1.50 2.50 2.75 Pi pe Dia . 8 .00 (in .) 10 .50 (Length In Feet) Discharge Ft3/Sec 0 .00 0.46 1.32 1.81 2 .52 2.66 ~ating Curve For Outlet Control Structure Depth Vs. Volume --Cl) Cl) ..... ~ l.50--~~~~--+-~~~~-+~~~~--11--~---,#-~+-~~~~--+-~~~~-1 -c. Cl) Q O .O O .P-~~~~+-~~~~+-~~~~-+-~~~~-+-~~~~-+-~~~~-1 0.00 0.50 1.00 1.50 2 .00 2 .50 3 .00 Discharge (Cubic Feet Per Second) Garrett E~neertng -4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 • Telephone : (979) 846-2688 . F;oc (979) 846-3094 . Page 17 !Storage Indication Curve Depth Storage Discharge 2s/t 2s/t+O (Feet) (Ft3) (Ft3/Sec) (Ft3/Sec) (Ft3/Sec) 0 .00 0 0.00 0 .00 0.00 0.50 79 0.46 2.63 3.09 1.00 497 1.32 16.57 17.89 1.50 1,117 1.81 37.23 39.04 2.50 2,657 2.52 88.57 91.09 2.75 3,067 2.66 102.23 104.89 St orage Indication Curve -"C c 2.00 0 u GI (/) ... GI fl.. -GI GI ..... 1.50 u .c :::i (.) -GI tlO ... (IJ .c u 1.00 UI 0 0 .00+-~~~~ ...... ~~~~-+~~~~-+~~~~---41--~~~~+-~~~--1 0.00 20.00 40.00 60.00 80.00 100.00 120.00 2s/t+O (Cubic Feet Per Second ) Garrett Er@ineering -4444 Carter Creek Par1<way Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 -Page 18 Inflow I Outflow Simulation 2-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.31 0.31 0.22 0.31 0.05 0.05 311.55 2 0.62 0.93 0.81 1.15 0.17 0.19 311.69 3 0.93 1.55 1.65 2.35 0.35 0.38 311.88 4 1.24 2.17 2.82 3.82 0.50 0.52 312.02 5 1.55 2.79 4.39 5.60 0.61 0.58 312.08 6 1.86 3.41 6.33 7.80 0.73 0.66 312.16 7 2.17 4.02 8.59 10.35 0.88 0.75 312.25 8 2.48 4.64 11.13 13.23 1.05 0.84 312.34 9 2.79 5.26 13.93 16.40 1.23 0.95 312.45 10 3.10 5.88 17.08 19.81 1.36 1.05 312.55 11 2.94 6.04 20.24 23.12 1.44 1.12 312.62 12 2.79 5.73 22.95 25.96 1.51 1.19 312.69 13 2.63 5.42 25.24 28.37 1.56 1.25 312.75 14 2.48 5.11 27.13 30.35 1.61 1.29 312.79 15 2.32 4.80 28.64 31.93 1.65 1.33 312.83 16 2.17 4.49 29.78 33.13 1.67 1.36 312.86 17 2.01 4.18 30.58 33.96 1.69 1.38 312.88 18 1.86 3.87 31.04 34.45 1.70 1.39 312.89 19 1.70 3.56 31.18 34.60 1.71 1.39 312.89 20 1.55 3.25 31.03 34.43 1.70 1.39 312.89 21 1.39 2.94 30.58 33.97 1.69 1.38 312.88 22 1.24 2.63 29.87 33.22 1.68 1.36 312.86 23 1.08 2.32 28.88 32.19 1.65 1.34 312.84 24 0.93 2.01 27.65 30.90 1.62 1.31 312.81 25 0.77 1.70 26.19 29.36 1.59 1.27 312.77 26 0.62 1.39 24.49 27.58 1.54 1.23 312.73 27 0.46 1.08 22.58 25.57 1.50 1.18 312.68 28 0.31 0.77 20.46 23.35 1.45 1.13 312.63 29 0.15 0.46 18.14 20.92 1.39 1.07 312.57 30 0.00 0.15 15.64 18.30 1.33 1.01 312.51 31 0.00 0.00 13.26 15.64 1.19 0.92 312.42 32 0.00 0.00 11.16 13.26 1.05 0.84 312.34 33 0.00 0.00 9.30 11.16 0.93 0.77 312.27 34 0.00 0.00 7.66 9.30 0.82 0.71 312.21 35 0.00 0.00 6.21 7.66 0.73 0.65 312.15 36 0.00 0.00 4.93 6.21 0.64 0.61 312.11 37 0.00 0.00 3.79 4.93 0.57 0.56 312.06 38 0.00 0.00 2.79 3.79 0.50 0.52 312.02 39 0.00 0.00 1.96 2.79 0.42 0.45 311.95 40 0.00 0.00 1.38 1.96 0.29 0.32 311.82 41 0.00 0.00 0.97 1.38 0.20 0.22 311.72 42 0.00 0.00 0.68 0.97 0.14 0.16 311.66 43 0.00 0.00 0.48 0.68 0.10 0.11 311.61 44 0.00 0.00 0.34 0.48 0.07 0.08 311.58 45 0.00 0.00 0.24 0.34 0.05 0.05 311.55 Garrett Engineering· 4444 Corter Creek Parkway Surte 108 ·Bryan, Texas 77802 ·Telephone: (979) 846-2688 ·Fox: (979) 846-3094 · Page 19 46 0.00 0.00 0.17 0.24 0.04 0.04 311.54 47 0.00 0.00 0.12 0.17 0.02 0.03 311.53 48 0.00 0.00 0.08 0.12 0.02 0.02 311.52 49 0.00 0.00 0.06 0.08 0.01 0.01 311.51 50 0.00 0.00 0.04 0.06 0.01 0.01 311.51 51 0.00 0.00 0.03 0.04 0.01 0.01 311.51 52 0.00 0.00 0.02 0.03 0.00 0.00 311.50 53 0.00 0.00 0.01 0.02 0.00 0.00 311.50 54 0.00 0.00 0.01 0.01 0.00 0.00 311.50 55 0.00 0.00 0.01 0.01 0.00 0.00 311.50 56 0.00 0.00 0.00 0.01 0.00 0.00 311.50 57 0.00 0.00 0.00 0.00 0.00 0.00 311.50 58 0.00 0.00 0.00 0.00 0.00 0.00 311.50 59 0.00 0.00 0.00 0.00 0.00 0.00 311.50 60 0.00 0.00 0.00 0.00 0.00 0.00 311.50 Garrett E~-.ing · 4444 Corter Creek Parkway Suite 108 · Bryan, Texas 7781:12 • Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Paae 20 Inflow/Outflow Simulation 2-Yea r Storm Event ' I 3 .50 I \ I \ I \ 3.00 \ I \ -I "'O 2 .50 c: 0 \ u Cl) (/) ... \ Cl) 0. -Cl) Cl) 2 .00 ~ u .0 ::I (.) -~ 0 :;:: -1.50 ::I 0 0 10 20 30 40 50 60 70 Time (Minutes) ---Pre-Development Hydrograp h • • • Post -Deve lopment Outflow Hydrograph Without Detention - - - -Post -Develo pm ent 'Free -Flow' ---Post-Develo pm ent Outfl ow With Detention Garrett Engineering · 4444 carter Creek Parkway Suite 108 • Bryan, Texa s 77802 · Telephone : (979) 846-2688 · Fax: (979) 846-3094 · Page 21 Inflow I Outflow Simulation 5-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.38 0.38 0.26 0.38 0.06 0.06 311.56 2 0.75 1.13 0.98 1.39 0.21 0.23 311.73 3 1.13 1.88 2.01 2.86 0.43 0.46 311.96 4 1.51 2.63 3.54 4.65 0.55 0.55 312.05 5 1.88 3.39 5.57 6.93 0.68 0.63 312.13 6 2.26 4.14 8.02 9.71 0.84 0.72 312.22 7 2.63 4.89 10.85 12.91 1.03 0.83 312.33 8 3.01 5.65 14.02 16.50 1.24 0.95 312.45 9 3.39 6.40 17.66 20.42 1.38 1.06 312.56 10 3.76 7.15 21.85 24.81 1.48 1.16 312.66 11 3.58 7.34 26.03 29.19 1.58 1.27 312.77 12 3.39 6.96 29.65 32.99 1.67 1.36 312.86 13 3.20 6.59 32.75 36.24 1.75 1.43 312.93 14 3.01 6.21 35.34 38.96 1.81 1.50 313.00 15 2.82 5.83 37.50 41.18 1.84 1.54 313.04 16 2.63 5.46 39.23 42.96 1.86 1.58 313.08 17 2.45 5.08 40.55 44.31 1.88 1.60 313.10 18 2.26 4.71 41.46 45.25 1.89 1.62 313.12 19 2.07 4.33 41.99 45.79 1.90 1.63 313.13 20 1.88 3.95 42.13 45.94 1.90 1.63 313.13 21 1.69 3.58 41.91 45.71 1.90 1.63 313.13 22 1.51 3.20 41.32 45.11 1.89 1.62 313.12 23 1.32 2.82 40.39 44.14 1.88 1.60 313.10 24 1.13 2.45 39.11 42.83 1.86 1.57 313.07 25 0.94 2.07 37.50 41.18 1.84 1.54 313.04 26 0.75 1.69 35.57 39.19 1.81 1.50 313.00 27 0.56 1.32 33.37 36.89 1.76 1.45 312.95 28 0.38 0.94 30.91 34.31 1.70 1.39 312.89 29 0.19 0.56 28.20 31.47 1.63 1.32 312.82 30 0.00 0.19 25.26 28.39 1.56 1.25 312.75 31 0.00 0.00 22.28 25.26 1.49 1.17 312.67 32 0.00 0.00 19.44 22.28 1.42 1.10 312.60 33 0.00 0.00 16.73 19.44 1.36 1.04 312.54 34 0.00 0.00 14.22 16.73 1.25 0.96 312.46 35 0.00 0.00 12.01 14.22 1.11 0.88 312.38 36 0.00 0.00 10.05 12.01 0.98 0.80 312.30 37 0.00 0.00 8.32 10.05 0.86 0.74 312.24 38 0.00 0.00 6.79 8.32 0.76 0.68 312.18 39 0.00 0.00 5.44 6.79 0.68 0.63 312.13 40 0.00 0.00 4.25 5.44 0.60 0.58 312.08 41 0.00 0.00 3.20 4.25 0.53 0.54 312.04 42 0.00 0.00 2.26 3.20 0.47 0.50 312.00 43 0.00 0.00 1.59 2.26 0.34 0.37 311.87 44 0.00 0.00 1.12 1.59 0.24 0.26 311.76 45 0.00 0.00 0.79 1.12 0.17 0.18 311.68 Garmt Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77002 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 22 46 0.00 0.00 0.55 0.79 0.12 0.13 311.63 47 0.00 0.00 0.39 0.55 0.08 0.09 311.59 48 0.00 0.00 0.27 0.39 0.06 0.06 311.56 49 0.00 0.00 0.19 0.27 0.04 0.04 311.54 50 0.00 0.00 0.13 0.19 0.03 0.03 311.53 51 0.00 0.00 0.09 0.13 0.02 0.02 311.52 52 0.00 0.00 0.07 0.09 0.01 0.02 311.52 53 0.00 0.00 0.05 0.07 0.01 0.01 311.51 54 0.00 0.00 0.03 0.05 0.01 0.01 311.51 55 0.00 0.00 0.02 0.03 0.00 0.01 311.51 56 0.00 0.00 0.02 0.02 0.00 0.00 311.50 57 0.00 0.00 0.01 0.02 0.00 0.00 311.50 58 0.00 0.00 0.01 0.01 0.00 0.00 311.50 59 0.00 0.00 0.01 0.01 0.00 0.00 311.50 60 0.00 0.00 0.00 0.01 0.00 0.00 311.50 Ga.mt Ercineerill! · 4444 carter Creek Par1<way Suite 108 ·Bryan, Texas n802 ·Telephone: (979) 846-2688 ·Fax: (979) 846-3094 · Page 23 Inflow/Outflow Simulation 5-Year Storm Event 4 .50 I \ ' I \ 4.00 \ ' I \ 3 .50 \ -I \ "C c 0 u 3 .00 Cl> \ (/) ... Cl> \ 0.. -Cl> Cl> 2 .50 .... • !::! .c :l 0 -~ 0 2.00 ::: -:l 0 1.50 0 10 20 30 40 50 60 70 Time (Minu tes) ---Pre -Develo p ment Hydrograph - - -Post -Dev elop ment Outflow Hydrograp h Without Detention • • • • • ·Post-Deve lopment 'Free -Flow' ---Post -Deve lopment Outfl ow With Detention Garrett Efllineeri'1f · 4444 carter Creek Parkway Suite 108 ·Bryan. Texas 77802 ·Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 24 Inflow I Outflow Simulation 10-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.42 0.42 0.30 0.42 0.06 0.07 311.57 2 0.84 1.27 1.10 1.56 0.23 0.25 311.75 3 1.27 2.11 2.28 3.21 0.47 0.50 312.00 4 1.69 2.96 4.07 5.24 0.58 0.57 312.07 5 2.11 3.80 6.39 7.87 0.74 0.66 312.16 6 2.53 4.65 9.20 11.04 0.92 0.77 312.27 7 2.96 5.49 12.42 14.69 1.13 0.89 312.39 8 3.38 6.34 16.08 18.76 1.34 1.02 312.52 9 3.80 7.18 20.37 23.26 1.44 1.13 312.63 10 4.22 8.03 25.27 28.40 1.56 1.25 312.75 11 4.01 8.24 30.15 33.51 1.68 1.37 312.87 12 3.80 7.82 34.39 37.96 1.78 1.47 312.97 13 3.59 7.39 38.09 41.79 1.85 1.55 313.05 14 3.38 6.97 41.28 45.06 1.89 1.62 313.12 15 3.17 6.55 43.97 47.83 1.93 1.67 313.17 16 2.96 6.13 46.17 50.09 1.96 1.71 313.21 17 2.75 5.70 47.91 51.88 1.99 1.75 313.25 18 2.53 5.28 49.18 53.19 2.00 1.77 313.27 19 2.32 4.86 50.01 54.04 2.01 1.79 313.29 20 2.11 4.44 50.41 54.45 2.02 1.80 313.30 21 1.90 4.01 50.38 54.42 2.02 1.80 313.30 22 1.69 3.59 49.94 53.97 2.01 1.79 313.29 23 1.48 3.17 49.11 53.11 2.00 1.77 313.27 24 1.27 2.75 47.89 51.86 1.98 1.75 313.25 25 1.06 2.32. 46.29 50.21 1.96 1.71 313.21 26 0.84 1.90 44.32 48.19 1.93 1.68 313.18 27 0.63 1.48 41.99 45.80 1.90 1.63 313.13 28 0.42 1.06 39.32 43.05 1.86 1.58 313.08 29 0.21 0.63 36.31 39.95 1.82 1.52 313.02 30 0.00 0.21 33.02 36.52 1.75 1.44 312.94 31 0.00 0.00 29.67 33.02 1.67 1.36 312.86 32 0.00 0.00 26.49 29.67 1.59 1.28 312.78 33 0.00 0.00 23.45 26.49 1.52 1.20 312.70 34 0.00 0.00 20.55 23.45 1.45 1.13 312.63 35 0.00 0.00 17.79 20.55 1.38 1.06 312.56 36 0.00 0.00 15.16 17.79 1.31 1.00 312.50 37 0.00 0.00 12.84 15.16 1.16 0.91 312.41 38 0.00 0.00 10.78 12.84 1.03 0.83 312.33 39 0.00 0.00 8.97 10.78 0.91 0.76 312.26 40 0.00 0.00 7.37 8.97 0.80 0.70 312.20 41 0.00 0.00 5.95 7.37 0.71 0.64 312.14 42 0.00 0.00 4.70 5.95 0.63 0.60 312.10 43 0.00 0.00 3.59 4.70 0.55 0.55 312.05 44 0.00 0.00 2.61 3.59 0.49 0.52 312.02 Garrett Ercineerll"4f . 4444 Carter Creek Parkway Suit<! 108. Biyan, Texas 7781J2 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 • Page 25 45 0.00 0.00 1.84 2.61 0.39 0.42 311.92 46 0.00 0.00 1.29 1.84 0.27 0.30 311.80 47 0.00 0.00 0.91 1.29 0.19 0.21 311.71 48 0.00 0.00 0.64 0.91 0.13 0.15 311.65 49 0.00 0.00 0.45 0.64 0.09 0.10 311.60 50 0.00 0.00 0.31 0.45 0.07 0.07 311.57 51 0.00 0.00 0.22 0.31 0.05 0.05 311.55 52 0.00 0.00 0.16 0.22 0.03 0.04 311.54 53 0.00 0.00 0.11 0.16 0.02 0.03 311.53 54 0.00 0.00 0.08 0.11 0.02 0.02 311.52 55 0.00 0.00 0.05 0.08 0.01 0.01 311.51 56 0.00 0.00 0.04 0.05 0.01 0.01 311.51 57 0.00 0.00 0.03 0.04 0.01 0.01 311.51 58 0.00 0.00 0.02 0.03 0.00 0.00 311.50 59 0.00 0.00 0.01 0.02 0.00 0.00 311.50 60 0.00 0.00 0.01 0.01 0.00 0.00 311.50 Garrett E11!i_,;ng · 44-« carter cntek Parl<way Suite 108 · Bryan. Tex.as 7781)2 . Telephone: (979) 1146-2688 . Fax: (979) 846-3094 . Page 26 Inflow/Outflow Simulation 10-Year Storm Event 5.00 . \ \ \ ' I \ 4.00 -\ ~ c 0 u I \ Cl) (/) ' ... Cl) \ a.. -Cl) I \ Cl) 3 .00 La. u :.c ::I 0 -~ 0 :;: -::I 0 2 .00 0 10 20 30 40 50 60 70 Time (Minutes) ---Pre -Deve lopment Hydrograph - - -Post -Development Outflow Hydrograph Without Detention ---Post -Development Outflow With Detention - - ---·Post-Deve lopment 'Free -Fl ow' Garrett E111ineeri111 · 4444 carter Cteek Par1<way Su~e 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 . F•x: (979) 846-3094 . Page 27 Inflow I Outflow Simulation 25-Year Storm Event Time Inflow 11+ 12 2s/t-0 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.48 0.48 0.34 0.48 0.07 0.08 311.58 2 0.97 1.45 1.26 1.79 0.27 0.29 311.79 3 1.45 2.41 2.68 3.67 0.49 0.52 312.02 4 1.93 3.38 4.79 6.06 0.63 0.60 312.10 5 2.41 4.34 7.51 9.14 0.81 0.70 312.20 6 2.90 5.31 10.77 12.82 1.03 0.83 312.33 7 3.38 6.27 14.50 17.04 1.27 0.97 312.47 8 3.86 7.24 18.92 21.74 1.41 1.09 312.59 9 4.34 8.20 24.06 27.12 1.53 1.22 312.72 10 4.83 9.17 29.87 33.22 1.68 1.36 312.86 11 4.58 9.41 35.66 39.28 1.81 1.50 313.00 12 4.34 8.93 40.81 44.58 1.89 1.61 313.11 13 4.10 8.44 45.36 49.26 1.95 1.70 313.20 14 3.86 7.96 49.31 53.32 2.00 1.77 313.27 15 3.62 7.48 52.69 56.79 2.05 1.84 313.34 16 3.38 7.00 55.50 59.68 2.09 1.90 313.40 17 3.14 6.51 57.77 62.01 2.12 1.94 313.44 18 2.90 6.03 59.50 63.80 2.15 1.98 313.48 19 2.65 5.55 60.72 65.05 2.16 2.00 313.50 20 2.41 5.07 61.44 65.79 2.17 2.01 313.51 21 2.17 4.58 61.67 66.02 2.18 2.02 313.52 22 1.93 4.10 61.42 65.77 2.17 2.01 313.51 23 1.69 3.62 60.71 65.04 2.16 2.00 313.50 24 1.45 3.14 59.55 63.85 2.15 1.98 313.48 25 1.21 2.65 57.95 62.20 2.13 1.95 313.45 26 0.97 2.17 55.93 60.12 2.10 1.91 313.41 27 0.72 1.69 53.49 57.62 2.06 1.86 313.36 28 0.48 1.21 50.65 54.70 2.02 1.80 313.30 29 0.24 0.72 47.42 51.37 1.98 1.74 313.24 30 0.00 0.24 43.80 47.66 1.93 1.67 313.17 31 0.00 0.00 40.05 43.80 1.87 1.59 313.09 32 0.00 0.00 36.40 40.05 1.82 1.52 313.02 33 0.00 0.00 32.91 36.40 1.75 1.44 312.94 34 0.00 0.00 29.57 32.91 1.67 1.35 312.85 35 0.00 0.00 26.39 29.57 1.59 1.28 312.78 36 0.00 0.00 23.36 26.39 1.52 1.20 312.70 37 0.00 0.00 20.46 23.36 1.45 1.13 312.63 38 0.00 0.00 17.70 20.46 1.38 1.06 312.56 39 0.00 0.00 15.08 17.70 1.31 0.99 312.49 40 0.00 0.00 12.77 15.08 1.16 0.91 312.41 41 0.00 0.00 10.73 12.77 1.02 0.83 312.33 42 0.00 0.00 8.92 10.73 0.90 0.76 312.26 43 0.00 0.00 7.32 8.92 0.80 0.70 312.20 44 0.00 0.00 5.91 7.32 0.71 0.64 312.14 45 0.00 0.00 4.66 5.91 0.62 0.60 312.10 Garrett Engineertng · 4444 carter C!'eek Parkway Suite 108 ·Bryan. Texas 77802 ·Telephone: (979) 846-2688 . Fax: (979) 846-3094 Page 28 46 0.00 0.00 3.56 4.66 0.55 0.55 312.05 47 0.00 0.00 2.59 3.56 0.49 0.52 312.02 48 0.00 0.00 1.82 2.59 0.38 0.42 311.92 49 0.00 0.00 1.28 1.82 0.27 0.29 311.79 50 0.00 0.00 0.90 1.28 0.19 0.21 311.71 51 0.00 0.00 0.63 0.90 0.13 0.14 311.64 52 0.00 0.00 0.44 0.63 0.09 0.10 311.60 53 0.00 0.00 0.31 0.44 0.07 0.07 311.57 54 0.00 0.00 0.22 0.31 0.05 0.05 311.55 55 0.00 0.00 0.15 0.22 0.03 0.04 311.54 56 0.00 0.00 0.11 0.15 0.02 0.02 311.52 57 0.00 0.00 0.08 0.11 0.02 0.02 311.52 58 0.00 0.00 0.05 0.08 0.01 0.01 311.51 59 0.00 0.00 0.04 0.05 0.01 0.01 311.51 60 0.00 0.00 0.03 0.04 0.01 0.01 311.51 Garrett ~lneerif'4! · 4444 carter Creek Parl<way Suite 108 · Bryan, Te>cH 77802 • Telephone: (979) 846-2688 • Fax: (979) 846-3094 • Page 29 Inflow/Outflow Simulation 25-Year Storm Event 6 .00 I \ \ 5 .00 \ I \ -"O c \ 0 u Q) (/) 4.00 \ ... Q) ll. \ -Q) Q) I ..... \ u :c ::I (.) ; 3 .00 0 :;: -::I 0 0 10 20 30 40 50 60 70 Time (M inutes) ---Pre -Develo pment Hydrogra ph • • • Post -Develo pment Outflow Hydrograph Without Detention -- - - -·Post-Deve lo pment 'Free -Flow ' ---Post -Devel opment Outflow With Detention Garrett Erci-Orc . 4444 carter Creek Partcway Suite 108 · Bryan, Texas n002 · Telephone: (979) 840-2688 · Fax: (979) 840-3094 · Page 30 Inflow I Outflow Simulation 50-Year Storm Event Time Inflow 11+ 12 2s/t-0 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.55 0.55 0.38 0.55 0.08 0.09 311.59 2 1.09 1.64 1.42 2.02 0.30 0.33 311.83 3 1.64 2.73 3.10 4.15 0.52 0.54 312.04 4 2.18 3.82 5.56 6.92 0.68 0.63 312.13 5 2.73 4.91 8.69 10.47 0.89 0.75 312.25 6 3.27 6.00 12.42 14.69 1.13 0.89 312.39 7 3.82 7.09 16.80 19.51 1.36 1.04 312.54 8 4.36 8.18 22.01 24.98 1.48 1.17 312.67 9 4.91 9.27 28.02 31.28 1.63 1.32 312.82 10 5.45 10.36 34.80 38.39 1.79 1.48 312.98 11 5.18 10.64 41.64 45.43 1.90 1.62 313.12 12 4.91 10.09 47.76 51.73 1.98 1.74 313.24 13 4.64 9.55 53.19 57.31 2.06 1.85 313.35 14 4.36 9.00 57.94 62.19 2.13 1.94 313.44 15 4.09 8.45 62.03 66.39 2.18 2.03 313.53 16 3.82 7.91 65.47 69.94 2.23 2.09 313.59 17 3.55 7.36 68.30 72.84 2.27 2.15 313.65 18 3.27 6.82 70.51 75.11 2.30 2.19 313.69 19 3.00 6.27 72.13 76.78 2.32 2.23 313.73 20 2.73 5.73 73.18 77.86 2.34 2.25 313.75 21 2.45 5.18 73.67 78.36 2.35 2.26 313.76 22 2.18 4.64 73.62 78.31 2.35 2.25 313.75 23 1.91 4.09 73.03 77.71 2.34 2.24 313.74 24 1.64 3.55 71.93 76.58 2.32 2.22 313.72 25 1.36 3.00 70.33 74.93 2.30 2.19 313.69 26 1.09 2.45 68.25 72.79 2.27 2.15 313.65 27 0.82 1.91 65.69 70.16 2.23 2.10 313.60 28 0.55 1.36 62.67 67.05 2.19 2.04 313.54 29 0.27 0.82 59.20 63.49 2.14 1.97 313.47 30 0.00 0.27 55.29 59.47 2.09 1.89 313.39 31 0.00 0.00 51.23 55.29 2.03 1.81 313.31 32 0.00 0.00 47.28 51.23 1.98 1.73 313.23 33 0.00 0.00 43.43 47.28 1.92 1.66 313.16 34 0.00 0.00 39.69 43.43 1.87 1.58 313.08 35 0.00 0.00 36.06 39.69 1.82 1.51 313.01 36 0.00 0.00 32.57 36.06 1.74 1.43 312.93 37 0.00 0.00 29.25 32.57 1.66 1.35 312.85 38 0.00 0.00 26.09 29.25 1.58 1.27 312.77 39 0.00 0.00 23.07 26.09 1.51 1.19 312.69 40 0.00 0.00 20.19 23.07 1.44 1.12 312.62 41 0.00 0.00 17.44 20.19 1.37 1.05 312.55 42 0.00 0.00 14.85 17.44 1.29 0.98 312.48 43 0.00 0.00 12.57 14.85 1.14 0.90 312.40 44 0.00 0.00 10.54 12.57 1.01 0.82 312.32 45 0.00 0.00 8.76 10.54 0.89 0.75 312.25 Garrett Engl.-ring · 4444 carter Creel< Par1<way Surte 108 • Bryan. Texas 7781J2 • Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 31 46 0.00 0.00 7.18 8.76 0.79 0.69 312.19 47 0.00 0.00 5.78 7.18 0.70 0.64 312.14 48 0.00 0.00 4.55 5.78 0.62 0.59 312.09 49 0.00 0.00 3.46 4.55 0.54 0.55 312.05 50 0.00 0.00 2.50 3.46 0.48 0.51 312.01 51 0.00 0.00 1.76 2.50 0.37 0.40 311.90 52 0.00 0.00 1.23 1.76 0.26 0.28 311.78 53 0.00 0.00 0.87 1.23 0.18 0.20 311.70 54 0.00 0.00 0.61 0.87 0.13 0.14 311.64 55 0.00 0.00 0.43 0.61 0.09 0.10 311.60 56 0.00 0.00 0.30 0.43 0.06 0.07 311.57 57 0.00 0.00 0.21 0.30 0.04 0.05 311.55 58 0.00 0.00 0.15 0.21 0.03 0.03 311.53 59 0.00 0.00 0.10 0.15 0.02 0.02 311.52 60 0.00 0.00 0.07 0.10 0.02 0.02 311.52 Garmt E~neerif"4! • 4444 Carter Creek Par1<way Suite 108 · Bryan, Texas 77802 · Telepl10nt: (979) 846-2688 • Fax: (979) 846-3094 • Page 32 Inflow/Outflow Simulation 50-Year Storm Event •' I \ 6 .00 I \ I \ I \ I 5.00 ' I \ -I "'Cl c 0 \ u Q) (/) 4 .00 ... Q) Q. -Q) Q) I.I. u ..Q ::I 0 3.00 -~ 0 :;: -::I 0 2.00 0 10 20 30 40 50 60 70 T i me (Minutes) ---Pre-Development Hydrograph • • • Post -Deve lopment Outflow Hydrograph Without Detention - -- - -·Post -Development 'Free-Flow' ---Post-Development Outflow With Detention Garrett Efl!ineerirv • 4444 Corter Creel< Parkway Su~e 108 · Bryan , Texas 778/J2 • Telephone: (979) 846-2688 . Fax: (979) 846-3094 • Page 33 Inflow I Outflow Simulation 100-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.57 0.57 0.40 0.57 0.08 0.09 311.59 2 1.14 1.71 1.48 2.11 0.31 0.34 311.84 3 1.71 2.85 3.27 4.33 0.53 0.54 312.04 4 2.28 3.99 5.85 7.25 0.70 0.64 312.14 5 2.85 5.13 9.14 10.97 0.92 0.77 312.27 6 3.42 6.26 13.05 15.40 1.18 0.92 312.42 7 3.99 7.40 17.70 20.46 1.38 1.06 312.56 8 4.56 8.54 23.21 26.24 1.51 1.20 312.70 9 5.13 9.68 29.56 32.89 1.67 1.35 312.85 10 5.70 10.82 36.72 40.38 1.83 1.53 313.03 11 5.41 11.11 43.97 47.83 1.93 1.67 313.17 12 5.13 10.54 50.46 54.50 2.02 1.80 313.30 13 4.84 9.97 56.23 60.43 2.10 1.91 313.41 14 4.56 9.40 61.28 65.62 2.17 2.01 313.51 15 4.27 8.83 65.64 70.11 2.23 2.10 313.60 16 3.99 8.26 69.32 73.90 2.29 2.17 313.67 17 3.70 7.69 72.36 77.01 2.33 2.23 313.73 18 3.42 7.12 74.75 79.48 2.36 2.28 313.78 19 3.13 6.55 76.53 81.30 2.39 2.31 313.81 20 2.85 5.98 77.70 82.51 2.40 2.34 313.84 21 2.56 5.41 78.29 83.11 2.41 2.35 313.85 22 2.28 4.84 78.31 83.13 2.41 2.35 313.85 23 1.99 4.27 77.77 82.58 2.40 2.34 313.84 24 1.71 3.70 76.70 81.47 2.39 2.32 313.82 25 1.42 3.13 75.10 79.83 2.37 2.28 313.78 26 1.14 2.56 72.99 77.66 2.34 2.24 313.74 27 0.85 1.99 70.38 74.98 2.30 2.19 313.69 28 0.57 1.42 67.29 71.80 2.26 2.13 313.63 29 0.28 0.85 63.73 68.14 2.21 2.06 313.56 30 0.00 0.28 59.71 64.01 2.15 1.98 313.48 31 0.00 0.00 55.53 59.71 2.09 1.90 313.40 32 0.00 0.00 51.46 55.53 2.03 1.82 313.32 33 0.00 0.00 47.50 51.46 1.98 1.74 313.24 34 0.00 0.00 43.65 47.50 1.93 1.66 313.16 35 0.00 0.00 39.90 43.65 1.87 1.59 313.09 36 0.00 0.00 36.26 39.90 1.82 1.52 313.02 37 0.00 0.00 32.77 36.26 1.75 1.43 312.93 38 0.00 0.00 29.44 32.77 1.66 1.35 312.85 39 0.00 0.00 26.26 29.44 1.59 1.27 312.77 40 0.00 0.00 23.24 26.26 1.51 1.20 312.70 41 0.00 0.00 20.35 23.24 1.44 1.13 312.63 42 0.00 0.00 17.59 20.35 1.38 1.06 312.56 43 0.00 0.00 14.99 17.59 1.30 0.99 312.49 44 0.00 0.00 12.69 14.99 1.15 0.90 312.40 45 0.00 0.00 10.65 12.69 1.02 0.82 312.32 Garmt Ercineerirc · 4444 Corter Creel< Parl<way Suite 108 · Bryan. Texas 77802 · Telephone: (979) 846-2688 . Fax: (979) 846-3094 • Page 34 46 0.00 0.00 8.85 10.65 0.90 0.76 312.26 47 0.00 0.00 7.26 8.85 0.79 0.69 312.19 48 0.00 0.00 5.86 7.26 0.70 0.64 312.14 49 0.00 0.00 4.62 5.86 0.62 0.59 312.09 50 0.00 0.00 3.52 4.62 0.55 0.55 312.05 51 0.00 0.00 2.55 3.52 0.48 0.51 312.01 52 0.00 0.00 1.79 2.55 0.38 0.41 311.91 53 0.00 0.00 1.26 1.79 0.27 0.29 311.79 54 0.00 0.00 0.88 1.26 0.19 0.20 311.70 55 0.00 0.00 0.62 0.88 0.13 0.14 311.64 56 0.00 0.00 0.44 0.62 0.09 0.10 311.60 57 0.00 0.00 0.31 0.44 0.06 0.07 311.57 58 0.00 0.00 0.22 0.31 0.05 0.05 311.55 59 0.00 0.00 0.15 0.22 0.03 0.03 311.53 60 0.00 0.00 0.11 0.15 0.02 0.02 311.52 Garrett Entiineering · 4444 Carter Creek Parkway Surte 108 · Biyan. Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 35 7 .00 6.00 -"Cl c 5 .00 0 u Q) (/) ... Q) Q. -Q) Q) 4 .00 ..... u .a ::I 0 -~ 0 :;: 3.00 -::I 0 0 Inflow/Outflow Simulation 100-Year Storm Event I ' I ' ' ' ' ' ' 10 ' ' 20 30 40 50 Time (Minutes) ---Pre -Development Hydrograph • • • Post -Development Outflow Hydrograph Without Detention Post -Development Outflow With Detention • • • • • ·Post-Development 'Free-Flow' 60 70 Inflow /Outflow Simulation 2 -Year Storm Event -"O c 0 1.50 u G> (/) ... G> Q. -G> G> .... u .a ::I (.) -~ 0 1.00 = -::I 0 0 10 20 30 40 50 60 70 T i me (Minutes) --Pre -Development Hydrograph -Total Post-Development Hydrograph Garrett ~neering · 4444 Carter Creel< Parkway Surto 108 · Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 -Pago 37 Inflow/Outflow Simulation 5-Year Storm Event 2 .00 -"C c 0 u Q) (/) ... Q) Q. -Q) Q) 1.50 .... u :0 :I 0 -11: 0 :;: -:I 0 1.00 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Development Hydrograph -Total Post-Development Hydrograph Garrett E~neering · 4444 Carter C<oek Parl<way Sutte 108 · Bryan, Texas 77802 . Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Page 38 -"O c 0 u Cl) Inflow/Outflow Simulation 10-Year Storm Event ~ 2.00--~~-+----+-~~~+---+~~~~~f--~~~~+-~~~~-+-~~~~-+-~~~~--1 Cl) ll.. -Cl) Cl) ..... u :0 ::I 0 -; 1.50 0 :;:: -::I 0 o.oo .i....~~~-4--~~~-4--~~~4-~~~-+-~~~-+-;::::=i-.---+-~~~-1 0 10 20 30 40 50 60 70 Ti me (Minutes) --Pre -Development Hydrograph -Total Pos t -Development Hydrograph Garrett ~-rirc . 44-44 carter Creek Parkway Suite 108 · Bryan, Texas 778(J2 · Telephone : (979) 846-2688 • Fax: (979) 846-3094 • Page 39 Inflow/Outflow Simulation 25-Year Storm Event -"O 2 .50 c 0 l,J Cll (/) ... Cll Q. -Cll Cll 2.00 ..... l,J .c ::I (.) -~ 0 :;: -1.50 ::I 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Development Hydrograph -Total Post -Dev elopment Hydrograph Garrett E,.;-ri 111 ·4444 Carter Creek Par1<way Suite 108 · Bryan, Texas 778/J2 · Tetephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 40 Inflow/Outflow Simulation 50-Year Storm Event 3.00 -"C c 0 (,) Q) en ... 2.50 Q) ll.. -Q) Q) ..... (,) .c ::I 2.00 (.) -:t 0 :;: -::I 0 1.50 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Development Hydrograph -Total Post -Development Hydrograph Garrett Erclneerirc . 4444 Garter Creek Par1<way Suite 108 -Bryan. Texas 778/J2 · Telephone: (979) 114&2686 • Fax: (979) 114&3094 -Page 41 Inflow/Outfl ow Simulation 100-Year Storm Event 3 .00 -"C c 0 u Q) en ... 2 .50 Q) 0.. -Q) Q) ..... u ..c ::I 2 .00 0 -:i: 0 :;: -::I 0 1.50 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Development Hydrograph -Total Post-Development Hydrograph Garrett Engineering · 4444 carter Creek Parkway Suite 108 • Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 • Page 42 Detention Pond Storage Volumes as Percent of Maximum Volume l~~il~1 ~~~~~~~~~~~~~~~~ 703 -1----------------------~ Cl) E , ... , .. .,.,.,.,.,.,.,., ::s 0 603-1------------------ > E ::s E -~ 503 -1-----------~ ~ -0 -c B 403 -------"""' ... Cl) D.. 303 203 103 2-year 5-year 10-year 25-year Design Storm Storm Simulation Synopsis 2 · ear 5· ear 10-ear 25 -ear Storm Depth 1.39 1.63 1.80 2.02 Storm Elevation 312 .89 313.13 313.30 313.52 Storm Volume 987 1281 1573 1915 Maximum Capacity 3067 3067 3067 3067 Percent of Capacity 323 423 513 623 50-year 50 -ear 2.26 313.76 2281 3067 743 100-year 100-ear 2.35 313.85 2422 3067 793 Garrett Engineering · 4444 Carter Creek Par1<way Suite 108 . Bryan, Texas 77802 • Telephone: (979) 846-2688 . Fax: (979) 846-3094 • Page 43 ·- Determine Total Pre-Development Peak Storm Water Discharge Rates Tributary Area ("A"): 0.70 Pervious Area: Impervious Area : Run-Off Coefficient ("Cwt"): Time Of Concentration ("T /c"): Woodlands: Pastures: Pavements: Acres 0.50 0 .66 0.05 10.00 Low Elevation : High Elevation : Distance (Feet): Slope (% Grade): Velocity ("Vw"): Time: Low Elevation: High Elevation: Distance (Feet): Slope(% Grade): Velocity ("Vp"): Time: Low Elevation : High Elevation: Distance (Feet): Slope(% Grade): Velocity ("Vpave"): Time: TotalTravel Time: Acres Acres Use Min . Travel Time: Hourly Intensity Rates ("I "): 2 -Year: 6 .33 5 -Year: 7 .69 10-Year: 8.63 25 -Year: 9.86 50-Year: 11.15 100-Year: 11.64 Peak Discharge Rate ("Q"): 2 -Year: 2.24 5 -Year: 2 .73 10-Year: 3.06 25-Year: 3.50 50-Year : 3.95 100-Year: 4 .13 c = 0 .47 c = 0.97 311.00 318.50 180.58 4 .15 2 .08 Feet I Second 1.45 Minutes 0.00 0 .00 0.00 0 .00 0 .00 Feet I Second 0.00 Minutes 0.00 0.00 0.00 0.00 0.00 Feet I Second 0.00 Minutes 1.45 Minutes 10.00 Minutes Inches I Hou r Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Garrett Eng ineering -44-44 carter Creek Par1<way Suite 108 -Btyan, Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 -Page I Determine Post-development Peak Storm Water Discharge (No Detention) Tributary Area ("A"): 0.70 Acres Pervious Area: Impervious Area : Run-Off Coeff icient ("Cwt "): 0.91 T i me Of Concentration ("T le"): Hourly Intensity Rates ("I"): Peak Discharge Rate ("Q"): 0 .08 0 .62 10.00 2-Year: 5 -Year: 10-Year: 25 -Year: 50 -Year : 100-Year : 2 -Year: 5-Year: 10-Year : 25 -Year: 50-Year: 100-Year: Comparison Of Predevelopment And Post-development Peak Discharge Rates Predevelopme nt 2 -Year: 2.24 Ft31sec 5 -Year : 2.73 Ft31sec 10-Year : 3 .06 Ft31sec 25 -Year : 3.50 Ft31sec 50 -Year : 3.95 Ft31sec 100-Yea r : 4.13 Ft31sec Preliminary Determination Of Detention Pond Volume 2 -Year : 1.81 Ft31sec x (30 Min . x 60 5-Year: 2 .2 1 Ft31sec x (30 Min. x 60 10-Year : 2.48 Ft31sec x (30 Min. x 60 25 -Year: 2 .83 Ft31sec x (30 Min. x 60 50 -Year: 3 .20 Ft31sec x (30 Mi n. x 60 100-Year : 3 .34 Ft31sec x (30 Min . x 60 Acres Acres C= 0.46 c = 0 .97 Minutes 6 .33 Inches I Hour 7.69 Inches I Hour 8 .63 Inches I Hour 9.86 Inches I Hour 11 .15 Inches I Hour 11.64 Inches I Hour 4.06 Cubic Feet I Second 4.93 Cubic Feet I Second 5.54 Cubic Feet I Second 6 .33 Cubic Feet I Second 7.15 Cubic Feet I Second 7.47 Cubic Feet I Second Post -Deve lopment Increase 4 .06 Ft31sec 1.81 Ft31sec 4.93 Ft31sec 2.21 Ft31sec 5.54 Ft31sec 2 .48 Ft31sec 6 .33 Ft31sec 2 .83 Ft31sec 7.15 Ft31sec 3 .20 Ft31sec 7.47 Ft31sec 3.34 Ft31sec Sec . I 2 )= 1,633 Cubic Sec . I 2 )= 1,986 Cubic Sec. I 2 )= 2,229 Cub ic Sec . I 2 )= 2 ,545 Cub ic Sec . I 2 )= 2 ,877 Cu b ic Sec . I 2 )= 3 ,004 Cubic Time Base (Tb)= 3.00 x T le And Time Of Concentration (T le) Of 10 Minutes. Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 7781)2 • Telephone: (979) 846-2688 · Fax: (979) 846·3094 · Page 2 Feet Feet Fee t Feet Fe et Feet Determine Post-Development "Free-Flow" Peak Storm Water Discharge Tributary Area ("A"): 0 .086 Pervious Area: Impervious Area: Acres 0.054 0.032 Run-Off Coeffic ient ("Cwt "): 0 .66 Time Of Co ncentration ("T /c"): 10.00 Hourly Intensity Rates ("I"): 2-Year: 5 -Yea r: 10-Year : 25-Year: 50-Year : 100-Year: Peak Discharge Rate ("Q"): 2 -Year: 5 -Year : 10-Year : 25-Year: 50-Year : 100-Year: Acres Acres Minutes (M i n.) 6 .33 7 .69 8.63 9 .86 11.15 11.64 0 .36 0 .44 0 .49 0 .56 0.63 0.66 c = 0.47 c = 0 .97 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Garrett Engineering -4-4-44 Garter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 -Page 3 Determine Post-Development Flow Into Detention Pond T ri butary Area ("A"): 0 .617 Pervious Area: Impervious Area : Acres 0.026 0.591 Run-Off Coefficient ("Cwt"): 0.95 T i me Of Co ncentration ("T /c"): 10.00 Hourly Intens ity Rates ("I"): 2 -Year: 5 -Year: 10 -Year: 25 -Year: 50 -Year: 100-Year: Peak Discharge Rate ("Q"): 2 -Year : 5-Year : 10-Year: 25-Year: 50-Year : 100-Year: Acres Acres M i nutes 6 .33 7.69 8 .63 9.86 11.15 11.64 3.70 4 .50 5.06 5 .77 6 .53 6 .81 c = 0.47 c = 0 .97 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Garrett Engineering · 4444 Carter Creek Parkway Sui te 108 · Bryan , Texas 77802 · Telephone : (979) 846-2688 . Fax: (979) 846-3094 . Page 4 Pre-Development Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.22 0.27 0.31 0.35 0.40 0.41 2 0.45 0.55 0.61 0.70 0.79 0.83 3 0.67 0.82 0.92 1.05 1.19 1.24 4 0.90 1.09 1.22 1.40 1.58 1.65 5 1.12 1.36 1.53 1.75 1.98 2.06 6 1.35 1.64 1.84 2.10 2.37 2.48 7 1.57 1.91 2.14 2.45 2.77 2.89 8 1.79 2.18 2.45 2.80 3.16 3.30 ' 9 2.02 7-.LIO 2.46 2,'0q 2.76 3 :zJ 3.15-:S.l.:.Li 3.56 Lf~oo 3.71 L/.zs 11 2.13 2.59 2.91 3.32 3.76 3.92 12 2.02 2.46 2.76 3.15 3.56 3.71 13 1.91 2.32 2.60 2.97 3.36 3.51 14 1.79 2.18 2.45 2.80 3.16 3.30 15 1.68 2.05 2.30 2.62 2.96 3.10 16 1.57 1.91 2.14 2.45 2.77 2.89 17 1.46 1.77 1.99 2.27 2.57 2.68 18 1.35 1.64 1.84 2.10 2.37 2.48 19 1.23 1.50 1.68 1.92 2.17 2.27 20 1.12 1.36 1.53 1.75 1.98 2.06 21 1.01 1.23 1.38 1.57 1.78 1.86 22 0.90 1.09 1.22 1.40 1.58 1.65 23 0.79 0.95 1.07 1.22 1.38 1.44 24 0.67 0.82 0.92 1.05 1.19 1.24 25 0.56 0.68 0.77 0.87 0.99 1.03 26 0.45 0.55 0.61 0.70 0.79 0.83 27 0.34 0.41 0.46 0.52 0.59 0.62 28 0.22 0.27 0.31 0.35 0.40 0.41 29 0.11 0.14 0.15 0.17 0.20 0.21 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 o.oo. 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett E~ineering • 4444 Carter Creek Par1<way Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Page 5 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering· 4444 Carter Creek Parkway Suite 108 · Bryan. Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 • Page 6 Post-Development Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.41 0.49 0.55 0.63 0.72 0.75 2 0.81 0.99 1.11 1.27 1.43 1.49 3 1.22 1.48 1.66 1.90 2.15 2.24 4 1.62 1.97 2.22 2.53 2.86 2.99 5 2.03 2.47 2.77 3.16 3.58 3.73 6 2.43 2.96 3.32 3.80 4.29 4.48 7 2.84 3.45 3.88 4.43 5.01 5.23 8 3.25 3.95 4.43 5.06 5.72 5.97 9 3.65 4.44 4.98 5.69 6.44 6.72 11 3.86 4.69 5.26 6.01 6.79 7.09 12 3.65 4.44 4.98 5.69 6.44 6.72 13 3.45 4.19 4.71 5.38 6.08 6.35 14 3.25 3.95 4.43 5.06 5.72 5.97 15 3.04 3.70 4.15 4.74 5.36 5.60 16 2.84 3.45 3.88 4.43 5.01 5.23 17 2.64 3.21 3.60 4.11 4.65 4.85 18 2.43 2.96 3.32 3.80 4.29 4.48 19 2.23 2.71 3.05 3.48 3.93 4.11 20 2.03 2.47 2.77 3.16 3.58 3.73 21 1.83 2.22 2.49 2.85 3.22 3.36 22 1.62 1.97 2.22 2.53 2.86 2.99 23 1.42 1.73 1.94 2.21 2.50 2.61 24 1.22 1.48 1.66 1.90 2.15 2.24 25 1.01 1.23 1.38 1.58 1.79 1.87 26 0.81 0.99 1.11 1.27 1.43 1.49 27 0.61 0.74 0.83 0.95 1.07 1.12 28 0.41 0.49 0.55 0.63 0.72 0.75 29 0.20 0.25 0.28 0.32 0.36 0.37 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering· 4444 Garter Creek Parkway Suite 108 · Bryan, Texas 77802. Telephone: (979) 846-2688 · fax: (979) 846-3094 Page 7 ' . . ;. 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering -4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 Page 8 Post-Development "Free-Flow" Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.04 0.04 0.05 0.06 0.06 0.07 2 0.07 0.09 0.10 0.11 0.13 0.13 3 0.11 0.13 0.15 0.17 0.19 0.20 4 0.14 0.17 0.20 0.22 0.25 0.26 5 0.18 0.22 0.25 0.28 0.32 0.33 6 0.22 0.26 0.29 0.34 0.38 0.40 7 0.25 0.31 0.34 0.39 0.44 0.46 8 0.29 0.35 0.39 0.45 0.51 0.53 9 0.32 0.39 0.44 0.50 0.57 0.59 11 0.34 0.41 0.47 0.53 0.60 0.63 12 0.32 0.39 0.44 0.50 0.57 0.59 13 0.31 0.37 0.42 0.48 0.54 0.56 14 0.29 0.35 0.39 0.45 0.51 0.53 15 0.27 0.33 0.37 0.42 0.47 0.50 16 0.25 0.31 0.34 0.39 0.44 0.46 17 0.23 0.28 0.32 0.36 0.41 0.43 18 0.22 0.26 0.29 0.34 0.38 0.40 19 0.20 0.24 0.27 0.31 0.35 0.36 20 0.18 0.22 0.25 0.28 0.32 0.33 21 0.16 0.20 0.22 0.25 0.28 0.30 22 0.14 0.17 0.20 0.22 0.25 0.26 23 0,13 0.15 0.17 0.20 0.22 0.23 24 0.11 0.13 0.15 0.17 0.19 0.20 25 0.09 0.11 0.12 0.14 0.16 0.17 26 0.07 0.09 0.10 0.11 0.13 0.13 27 0.05 0.07 0.07 0.08 0.09 0.10 28 0.04 0.04 0.05 0.06 0.06 0.07 29 0.02 0.02 0.02 0.03 0.03 0.03 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering · 4444 Garter Creek Parl<way Suite 108 · llfyan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 9 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering· 4444 Carter Creek Parkway Suite 108. Bryan, Texas 77802. Telephone: (979) 846-2688 . Fax: (979) 846-3094 -Page 10 Post-Development Flow Routed Through Detention Pond Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.37 0.45 0.51 0.58 0.65 0.68 2 0.74 0.90 1.01 1.15 1.31 1.36 3 1.11 1.35 1.52 1.73 1.96 2.04 4 1.48 1.80 2.02 2.31 2.61 2.73 5 1.85 2.25 2.53 2.89 3.26 3.41 6 2.22 2.70 3.03 3.46 3.92 4.09 7 2.59 3.15 3.54 4.04 4.57 4.77 8 2.96 3.60 4.04 4.62 5.22 5.45 9 3.33 4.05 4.55 5.20 5.87 6.13 11 3.52 4.28 4.80 5.48 6.20 6.47 12 3.33 4.05 4.55 5.20 5.87 6.13 13 3.15 3.83 4.30 4.91 5.55 5.79 14 2.96 3.60 4.04 4.62 5.22 5.45 15 2.78 3.38 3.79 4.33 4.90 5.11 16 2.59 3.15 3.54 4.04 4.57 4.77 17 2.41 2.93 3.29 3.75 4.24 4.43 18 2.22 2.70 3.03 3.46 3.92 4.09 19 2.04 2.48 2.78 3.18 3.59 3.75 20 1.85 2.25 2.53 2.89 3.26 3.41 21 1.67 2.03 2.27 2.60 2.94 3.07 22 1.48 1.80 2.02 2.31 2.61 2.73 23 1.30 1.58 1.77 2.02 2.28 2.39 24 1.11 1.35 1.52 1.73 1.96 2.04 25 0.93 1.13 1.26 1.44 1.63 1.70 26 0.74 0.90 1.01 1.15 1.31 1.36 27 0.56 0.68 0.76 0.87 0.98 1.02 28 0.37 0.45 0.51 0.58 0.65 0.68 29 0.19 0.23 0.25 0.29 0.33 0.34 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering· 4444 Carter Creek Par1<way Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Page 11 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering· 4444 Carter Creek Parkway Suite 108. Bryan, Texas 77802. Telephone: (979) 846·2688 . Fax: (979) 846-3094 . Page 12 4.50 -4 .00 i;, c 0 u 3 .50 II) (/) ... II) 3 .00 D.. -II) 2.50 II) ..... u 2.00 .c :::s ~ 1.50 II) bl) ... 1.00 (Q .c u II) 0.50 Q 0 .00 Total Pre-Devel op m ent Vs. Total Post-Deve l opment (No Detention) Peak Discharge Rates 2 -Year Storm Event I "' I '\ I ~ I i ~ \ I I ~ I\ I I ~ ~~ II ~'\ /I ~ 0 10 20 3 0 40 50 60 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Total Pre-D evelopment Vs. To t al Post-Developme nt (No Detenti o n) Pea k Disc harge Rates 5 -Year Storm Event 6 .00 -i;, c 0 5.00 u II) (/) ... II) 4 .00 D.. -II) II) ..... 3 .00 u .c :::s ~ 2 .00 :0 70 ... (Q ~ 1.00 ---__,___,,__~~-t--~~~~t-----~~--t~~~~---+-~~~~-+-~~~~--+-~~~---< II) Q 0 .00~~~~ ....... ~~~~1--~~......;::11-~~~-..~~~~a.-~~~-1-~~~-1 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Deve lopment Hydrograph -Post -Development Outflow Hydrograph Without Detention Garrett Engineering · 4444 Carter Creek Parkway Suite 108 ·Bryan, Texas 77802 -Telephone : (979) 846-2688 -Fax: (979) 846-3094 -Page 13 Total Pre-Development Vs. Total Post-Development (No Det ent ion) Peak Di scharge Rates 10-Year Storm Event ....... 'tJ c 8 5.oo--~~~~'-!----~~~-t-~~~~-+-~~~~-+-~~~~-+-~~~~-+-~~~-----" Cl> "' ... ~ 4.oo--~~~,__-+-~----'~~-+-~~~~-+-~~~~-+-~~~~-+-~~~~-+-~~~~ -Cl> Cl> ..... u 3 .00+-~---.f--~.,,....~~~-"1.+-~~~~-+-~~~~-+-~~~~-+-~~~~-+-~~~~ .Q ::I ~ 2.00 --~1----F-~-+-~~---"o~-+-~~~~-+-~~~~-t-~~~~-t-~~~~-+-~~~~ Cl> bO ... co ~ 1.00+--1-1<---~~-+-~~~~-+---"~~~-+-~~~~-+-~~~~-+-~~~~-+-~~~~ UI c 0 7 .00 -'tJ c 0 6 .0 0 u Cl> "' ... 5 .00 Cl> ll. -Cl> 4 .00 Cl> ..... u 10 20 30 40 50 60 Time (Minutes) --Pre-Develop ment Hydrogra ph -Post -Development Outflow Hydrograph Without Detention To t al Pre-Development Vs. Total Post-Deve lopment (No Detention) Peak D isc harge Rates 25-Year Storm Event 70 .Q 3.00--~-1-~-+-+-----~~--1~~~~-+~~~~-t-~~~~-+-~~~~+--~~~--1 ::I 0 -~ 2.0 0 +--J'--c-/-~+-~~~~f---4c~~-+~~~~-+-~~~~-+-~~~~+-~~~--I ... co ~ 1.00--1-+~~~+--~~~--1'----"....-~-+~~~~-t-~~~~-+-~~~~+--~~~--1 UI c 0 .00 +-~~~-+~~~~+-~~~ ...... ~~~~+-~~~-+~~~~1-~~~_, 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Develo pment Hydrograph -Post -Development Outf low Hydrograph Without Detention Garrett Engl-ring . 4444 carter Creek Parkway Suite 108 . Bryan, Texas 77802 ·Telephone : (979) 846-2688 ·Fax: (979) 846-3094 · Page 14 -"O Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 50-Year Storm Event g 7.00--~~~----,--~~~--;~~~~-+~~~~-+--~~~~-+-~~~~+-~~~--1 u Q) ~ 6.oo--~~~-#--t--~~~--+~~~~-+-~~~~-+-~~~~-+-~~~~t--~~~---t Q) a.. -5 .oo--~~-+-~-t--~--'0.----+~~~~-+-~~~~-+-~~~~-+-~~~~t--~~~---t Q) Q) ~ 4 .oo--~-4r--~r-~~~-..t~~~~--+~~~~-+-~~~~-1-~~~~1--~~~---1 :0 8 3 .oo--~-#----+---t~~-.-~-+----~~~+-~~~--+-~~~~-+-~~~---<f--~~~__, -Q) ~ 2 .00----1---+~~+-~~~___,..~___,,.,._~--+~~~~-+-~~~~-1-~~~~1--~~~---1 C'O .c ~ 1.00-..,__~~~+-~~~--+~~------+-~~~~-+-~~~~-+-~~~~+--~~~---t 0 -"O c 0 u Q) "' .. Q) a.. -Q) Q) LI. u .c :s (..) -Q) 0 10 20 30 40 50 60 T i me (Minutes) --Pre -Deve lopment Hyd rog raph -Post -De velopment Outfl ow Hydrograph Without Detention Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 100-Year Storm Event 8.00 7.00 6.00 5 .00 4.00 3.00 ~ 2 .00 C'O .c u 1.00 Ill 0 0.00 0 10 20 30 40 50 60 Time (Minutes) --Pre -Development Hydrograph -Post -Development Outflo w Hydrograph Without Detention Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bl)'an, Texas 77802 ·Telephone: (979) 846-2688 ·Fax: (979) 846-3094 · Page 15 70 70 I Detention Pond ~pth Vs . Volume --G> G> ..... Elevation 313.50 313.75 313.90 314.00 314.10 314.25 Depth (Feet) 0 .00 0 .25 0.40 0 .50 0.60 0 .75 Detention Pond Depth Vs. Volume Volume (Ft3) 0 119 564 1016 1563 2669 ;; 0 .40 --~~~~---+--~~~~--+-~~~~~f--~~~~--t-~~~~~r-~~~~-< -c.. G> c 0 500 1000 1500 2000 2500 3000 Detention Pond Volume (Cubic Feet) Garrett E~ineering -4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 -Fa x: (979) 846-3094 -Page 16 Rating Curve For Outlet Control Structure De th Vs. Volume Elevation 313.50 313.75 313.90 314.00 314.10 314.25 Depth (Feet) 0 .00 0.25 0.40 0 .50 0 .60 0.75 Trapezoidal Weir 0 .96 Discharge Ft3/Sec 0 0 .00 0.46 1.08 1.65 2 .34 3 .64 Rating Curve For Outlet Con trol Structu re De pth Vs . Vol ume --G> G> ..... foot ~ 0.40 --~~~-+-~~~---+--,,_~~-+-~~~--+-~~~-1-~~~-+-~~~--+~~~-----l -c.. G> 0 0 .00+-~~~t--~~--t~~~-+~~~-t-~~~+-~~~i--~~-+~~~-t 0.00 0 .50 1.00 1.50 2 .00 2.50 3.00 3.50 4.00 Discharge (Cubic Feet Per Sec ond ) Garrett Engineering · 4444 Garter Creek Parkway Suite 108 -Bryan, Texas 77802 -Te lephone: (979) 846·2688 . Fax: (979) 846·3094 . Page 17 !S t orage Ind i ca t ion Cu rve Depth Storage Discharge 2s /t 2s/t+O (Feet) (Ft3) (Ft3/Sec) (Ft3/Sec) (Ft3/Sec) 0 .00 0 0.00 0.00 0.00 0.25 119 0.46 3 .96 4.42 0.40 564 1.08 18.80 19.88 0.50 1,016 1.65 33.85 35.50 0.60 1,563 2 .34 52 .10 54.44 0 .75 2 ,669 3.64 88.98 92.61 Storage Indication Curve 4 .00 3 .00 -"C c: 0 u Q) 2 .50 (f) ... Q) 0... -Q) Q) Lo. 2.00 u ..c :I 0 -Q) tlO ... 1.50 ro .c: u "' Q 1.00 ~~ / / .V ~ / v / / ~ v~ / v I 3 .5 0 0 .5 0 0 .00 0 .00 10.00 20.00 30.00 40 .00 50.00 60.00 70.00 80.00 90.00 100.00 2s/t+O (Cubic Feet Per Second ) Garrett Enginee ring -4444 Garte r Creek Parkway Surte 108 -Brya n, Texas 77802 -Telephone : (979) 84&2688 • Fax: (979) 846-3094 -Page 18 Inflow I Outflow Simulation 2-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 313.50 1 0.37 0.37 0.29 0.37 0.04 0.02 313.52 2 0.74 1.11 1.11 1.40 0.15 0.08 313.58 3 1.11 1.85 2.34 2.96 0.31 0.17 313.67 4 1.48 2.59 3.96 4.93 0.49 0.25 313.75 5 1.85 3.33 6.14 7.29 0.58 0.28 313.78 6 2.22 4.07 8.82 10.21 0.70 0.31 313.81 7 2.59 4.82 11.97 13.63 0.83 0.34 313.84 8 2.96 5.56 15.54 17.52 0.99 0.38 313.88 9 3.33 6.30 19.53 21.84 1.15 0.41 313.91 10 3.70 7.04 23.92 26.57 1.32 0.44 313.94 11 3.52 7.22 28.16 31.14 1.49 0.47 313.97 12 3.33 6.85 31.76 35.02 1.63 0.50 314.00 13 3.15 6.48 34.75 38.24 1.75 0.51 314.01 14 2.96 6.11 37.17 40.86 1.84 0.53 314.03 15 2.78 5.74 39.08 42.91 1.92 0.54 314.04 16 2.59 5.37 40.50 44.45 1.97 0.55 314.05 17 2.41 5.00 41.47 45.50 2.01 0.55 314.05 18 2.22 4.63 42.04 46.10 2.03 0.56 314.06 19 2.04 4.26 42.21 46.30 2.04 0.56 314.06 20 1.85 3.89 42.03 46.10 2.03 0.56 314.06 21 1.67 3.52 41.52 45.55 2.01 0.55 314.05 22 1A8 3.15 40.71 44.67 1.98 0.55 314.05 23 1.30 2.78 39.61 43.48 1.94 0.54 314.04 24 1.11 2.41 38.24 42.01 1.89 0.53 314.03 25 0.93 2.04 36.64 40.28 1.82 0.53 314.03 26 0.74 1.67 34.81 38.30 1.75 0.51 314.01 27 0.56 1.30 32.76 36.10 1.67 0.50 314.00 28 0.37 0.93 30.53 33.69 1.58 0.49 313.99 29 0.19 0.56 28.11 31.08 1.49 0.47 313.97 30 0.00 0.19 25.52 28.29 1.39 0.45 313.95 31 0.00 0.00 22.95 25.52 1.29 0.44 313.94 32 0.00 0.00 20.56 22.95 1.19 0.42 313.92 33 0.00 0.00 18.34 20.56 1.11 0.40 313.90 34 0.00 0.00 16.30 18.34 1.02 0.39 313.89 35 0.00 0.00 14.42 16.30 0.94 0.37 313.87 36 0.00 0.00 12.69 14.42 0.86 0.35 313.85 37 0.00 0.00 11.10 12.69 0.80 0.33 313.83 38 0.00 0.00 9.63 11.10 0.73 0.31 313.81 39 0.00 0.00 8.29 9.63 0.67 0.30 313.80 40 0.00 0.00 7.05 8.29 0.62 0.29 313.79 41 0.00 0.00 5.91 7.05 0.57 0.28 313.78 42 0.00 0.00 4.86 5.91 0.52 0.26 313.76 43 0.00 0.00 3.90 4.86 0.48 0.25 313.75 44 0.00 0.00 3.08 3.90 0.41 0.22 313.72 45 0.00 0.00 2.43 3.08 0.32 0.17 313.67 Garrett Engineering· 4444 carter Creek Parl<way Suite 108 ·Bryan, Texas 77802 ·Telephone: (979) 846-2688 ·fax: (979) 846-3094 • Page 19 46 0.00 0.00 1.92 2.43 0.26 0.14 313.64 47 0.00 0.00 1.52 1.92 0.20 0.11 313.61 48 o.oo 0.00 1.20 1.52 0.16 0.09 313.59 49 0.00 0.00 0.95 1.20 0.13 0.07 313.57 50 0.00 0.00 0.75 0.95 0.10 0.05 313.55 51 0.00 0.00 0.59 0.75 0.08 0.04 313.54 52 0.00 0.00 0.47 0.59 0.06 0.03 313.53 53 0.00 0.00 0.37 0.47 0.05 0.03 313.53 54 0.00 0.00 0.29 0.37 0.04 0.02 313.52 55 0.00 0.00 0.23 0.29 0.03 0.02 313.52 56 0.00 0.00 0.18 0.23 0.02 0.01 313.51 57 0.00 0.00 0.14 0.18 0.02 0.01 313.51 58 0.00 0.00 0.11 0.14 0.02 0.01 313.51 59 0.00 0.00 0.09 0.11 0.01 0.01 313.51 60 0.00 0.00 0.07 0.09 0.01 0.01 313.51 Garrett Engineering· 4444 carter Creek Par1<way Suite 108 ·Bryan, Texas 77802 · Telepllone: (979) 846·2688 • Fax: (979) 846·3094 • Page 20 I nflow/Outflow Simulation 2-Year Sto r m Eve nt 4.00 I \ I \ 3 .50 \ ' I \ 3 .00 \ -'O I \ c 0 u GI \ V> ... 2.50 GI ll. I \ -GI GI ..... u :0 ::I 2 .00 0 -:I: 0 ;: -::I 0 1.50 0 10 20 30 40 50 60 70 Time (M inutes) ---Pre -Development Hydrograph • • • Post-Development Outflow Hydrograph Without Detention ----Post -Development 'Free-Flow' ---Post-Development Outflow With Detention Garrett Engineering · 4444 Carter Creek Par1<way Surte 108 ·Bryan, Texas 77002 ·Telephone : (979) 846-2688 ·Fax: (979) 846-3094 • Page 21 Inflow I Outflow Simulation 5-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 313.50 1 0.45 0.45 0.36 0.45 0.05 0.03 313.53 2 0.90 1.35 1.35 1.71 0.18 0.10 313.60 3 1.35 2.25 2.84 3.60 0.38 0.20 313.70 4 1.80 3.15 4.94 6.00 0.53 0.27 313.77 5 2.25 4.05 7.70 8.99 0.65 0.29 313.79 6 2.70 4.95 11.06 12.65 0.79 0.33 313.83 7 3.15 5.86 14.99 16.92 0.96 0.37 313.87 8 3.60 6.76 19.44 21.75 1.15 0.41 313.91 9 4.05 7.66 24.41 27.10 1.34 0.45 313.95 10 4.50 8.56 29.86 32.97 1.56 0.48 313.98 11 4.28 8.78 35.12 38.64 1.76 0.52 314.02 12 4.05 8.33 39.58 43.45 1.94 0.54 314.04 13 3.83 7.88 43.29 47.46 2.08 0.56 314.06 14 3.60 7.43 46.31 50.72 2.20 0.58 314.08 15 3.38 6.98 48.70 53.30 2.30 0.59 314.09 16 3.15 6.53 50.50 55.23 2.37 0.60 314.10 17 2.93 6.08 51.75 56.58 2.41 0.61 314.11 18 2.70 5.63 52.51 57.38 2.44 0.61 314.11 19 2.48 5.18 52.79 57.69 2.45 0.61 314.11 20 2.25 4.73 52.63 57.52 2.44 0.61 314.11 21 2.03 4.28 52.06 56.91 2.42 0.61 314.11 22 1.80 3.83 51.11 55.89 2.39 0.61 314.11 23 1.58 3.38 49.81 54.49 2.34 0.60 314.10 24 1.35 2.93 48.18 52.73 2.28 0.59 314.09 25 1.13 2.48 46.26 50.66 2.20 0.58 314.08 26 0.90 2.03 44.05 48.28 2.11 0.57 314.07 27 0.68 1.58 41.60 45.63 2.02 0.55 314.05 28 0.45 1.13 38.90 42.72 1.91 0.54 314.04 29 0.23 0.68 35.98 39.58 1.80 0.52 314.02 30 0.00 0.23 32.86 36.21 1.67 0.50 314.00 31 0.00 0.00 29.76 32.86 1.55 0.48 313.98 32 0.00 0.00 26.88 29.76 1.44 0.46 313.96 33 0.00 0.00 24.21 26.88 1.34 0.44 313.94 34 0.00 0.00 21.73 24.21 1.24 0.43 313.93 35 0.00 0.00 19.43 21.73 1.15 0.41 313.91 36 0.00 0.00 17.30 19.43 1.07 0.40 313.90 37 0.00 0.00 15.34 17.30 0.98 0.37 313.87 38 0.00 0.00 13.54 15.34 0.90 0.36 313.86 39 0.00 0.00 11.88 13.54 0.83 0.34 313.84 40 0.00 0.00 10.35 11.88 0.76 0.32 313.82 41 0.00 0.00 8.95 10.35 0.70 0.31 313.81 42 0.00 0.00 7.65 8.95 0.65 0.29 313.79 43 0.00 0.00 6.47 7.65 0.59 0.28 313.78 44 0.00 0.00 5.37 6.47 0.55 0.27 313.77 45 0.00 0.00 4.37 5.37 0.50 0.26 313.76 Garrett Engineeri~ -4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 . Fax: (979) 846-3094 -Page 22 46 0.00 0.00 3.45 4.37 0.46 0.25 313.75 47 0.00 0.00 2.72 3.45 0.36 0.19 313.69 48 0.00 0.00 2.15 2.72 0.29 0.15 313.65 49 0.00 0.00 1.70 2.15 0.23 0.12 313.62 50 0.00 0.00 1.34 1.70 0.18 0.10 313.60 51 0.00 0.00 1.06 1.34 0.14 0.08 313.58 52 0.00 0.00 0.84 1.06 0.11 0.06 313.56 53 0.00 0.00 0.66 0.84 0.09 0.05 313.55 54 0.00 0.00 0.52 0.66 0.07 0.04 313.54 55 0.00 0.00 0.41 0.52 0.05 0.03 313.53 56 0.00 0.00 0.33 0.41 0.04 0.02 313.52 57 0.00 0.00 0.26 0.33 0.03 0.02 313.52 58 0.00 0.00 0.20 0.26 0.03 0.01 313.51 59 0.00 0.00 0.16 0.20 0.02 0.01 313.51 60 0.00 0.00 0.13 0.16 0.02 0.01 313.51 Garrett Engineering -4444 Carter Creek Par1<way Suite 108 -Bryan, Texas 778JJ2 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 -Page 23 -"CJ c 0 u G> V> ... G> 0.. -G> G> ..... u .c ~ 0 -:t 0 :;:: -~ 0 I nflow/Outflow Simulation 5-Year Storm Event 5 .00 ' ' ' 4 .00 ' ' ' ' ' ' ' ' ' 3 .00 ' 2 .0 0 0 10 20 ---Pre -Development Hydrograph ---Post -Development Outflow With Detention 30 4 0 50 6 0 70 T ime (Minut es ) • • • Post -Deve lopment Outf low Hydrograph Without Detention -- - --·Post -Deve lopment 'Free-F low' Garrett Engineering . 4444 carter Creek Parl<way Suite 108 . Bryan, Texas 77802 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 24 Inflow I Outflow Simulation 10-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 313.50 1 0.51 0.51 0.40 0.51 0.05 0.03 313.53 2 1.01 1.52 1.51 1.92 0.20 0.11 313.61 3 1.52 2.53 3.19 4.04 0.42 0.23 313.73 4 2.02 3.54 5.62 6.73 0.56 0.27 313.77 5 2.53 4.55 8.78 10.17 0.69 0.31 313.81 6 3.03 5.56 12.61 14.34 0.86 0.35 313.85 7 3.54 6.57 17.07 19.19 1.06 0.39 313.89 8 4.04 7.58 22.15 24.66 1.26 0.43 313.93 9 4.55 8.59 27.79 30.74 1.48 0.47 313.97 10 5.06 9.61 33.96 37.39 1.72 0.51 314.01 11 4.80 9.86 39.92 43.82 1.95 0.54 314.04 12 4.55 9.35 44.97 49.27 2.15 0.57 314.07 13 4.30 8.85 49.18 53.82 2.32 0.60 314.10 14 4.04 8.34 52.64 57.52 2.44 0.61 314.11 15 3.79 7.84 55.38 60.47 2.54 0.62 314.12 16 3.54 7.33 57.47 62.71 2.62 0.63 314.13 17 3.29 6.82 58.95 64.30 2.67 0.64 314.14 18 3.03 6.32 59.85 65.27 2.71 0.64 314.14 19 2.78 5.81 60.23 65.67 2.72 0.64 314.14 20 2.53 5.31 60.10 65.53 2.72 0.64 314.14 21 2.27 4.80 59.52 64.90 2.69 0.64 314.14 22 2.02 4.30 58.50 63.81 2.66 0.64 314.14 23 1.77 3.79 57.08 62.29 2.61 0.63 314.13 24 1.52 3.29 55.28 60.36 2.54 0.62 314.12 25 1.26 2.78 53.14 58.06 2.46 0.61 314.11 26 1.01 2.27 50.67 55.41 2.37 0.60 314.10 27 0.76 1.77 47.90 52.44 2.27 0.59 314.09 28 0.51 1.26 44.87 49.17 2.15 0.57 314.07 29 0.25 0.76 41.60 45.63 2.02 0.55 314.05 30 0.00 0.25 38.09 41.85 1.88 0.53 314.03 31 0.00 0.00 34.61 38.09 1.74 0.51 314.01 32 0.00 0.00 31.38 34.61 1.61 0.49 313.99 33 0.00 0.00 28.38 31.38 1.50 0.47 313.97 34 0.00 0.00 25.60 28.38 1.39 0.45 313.95 35 0.00 0.00 23.02 25.60 1.29 0.44 313.94 36 0.00 0.00 20.63 23.02 1.20 0.42 313.92 37 0.00 0.00 18.41 20.63 1.11 0.40 313.90 38 0.00 0.00 16.36 18.41 1.02 0.39 313.89 39 0.00 0.00 14.48 16.36 0.94 0.37 313.87 40 0.00 0.00 12.74 14.48 0.87 0.35 313.85 41 0.00 0.00 11.15 12.74 0.80 0.33 313.83 42 0.00 0.00 9.68 11.15 0.73 0.32 313.82 43 0.00 0.00 8.33 9.68 0.68 0.30 313.80 44 0.00 0.00 7.09 8.33 0.62 0.29 313.79 Garrett Engineering· 4444 Corter Creek Parkway Suite 108 · Bryan. Texas 77002 · Telephone: (979) 846-2688 · Fax: (979) 846·3094 · Page 25 45 0.00 0.00 5.94 7.09 0.57 0.28 313.78 46 0.00 0.00 4.89 5.94 0.53 0.26 313.76 47 0.00 0.00 3.92 4.89 0.48 0.25 313.75 48 0.00 0.00 3.10 3.92 0.41 0.22 313.72 49 0.00 0.00 2.45 3.10 0.33 0.18 313.68 50 0.00 0.00 1.93 2.45 0.26 0.14 313.64 51 0.00 0.00 1.53 1.93 0.20 0.11 313.61 52 0.00 0.00 1.21 1.53 0.16 0.09 313.59 53 0.00 0.00 0.95 1.21 0.13 0.07 313.57 54 0.00 0.00 0.75 0.95 0.10 0.05 313.55 55 0.00 0.00 0.59 0.75 0.08 0.04 313.54 56 0.00 0.00 0.47 0.59 0.06 0.03 313.53 57 0.00 0.00 0.37 0.47 0.05 0.03 313.53 58 0.00 0.00 0.29 0.37 0.04 0.02 313.52 59 0.00 0.00 0.23 0.29 0.03 0.02 313.52 60 0.00 0.00 0.18 0.23 0.02 0.01 313.51 Garrett Engineering. 4444 Carter Creek Par1<way Sune 108 · Biyan. Texas n002 . Telephone: (979) 846-2688 · Fax: (979) 846·3094 Page 26 -~ c 0 u Q) en ... Q) Ii. -Q) Q) ..... u ..c :s u -~ 0 = -:s 0 Inf low/Outflow Simulation 10-Yea r Storm Event •' I \ 5 .00 \ I \ I ' \ 4.00 I \ I \ \ I I 3 .00 2 .00 0 10 20 ---Pre-Development Hydrograph ---Post-Development Outflow With Detention 30 40 50 60 70 Time (Minutes) • • • Post-Development Outflow Hydrograph Without Detention -----·Post-Developm ent 'Free-Flow ' Garrett Engineering. 4444 carter Creek Parkway Suite 108 . Bryan, Texas 77802 ·Telephone : (979) 846-2688 ·Fax: (979) 846·3094 · Page 27 Inflow I Outflow Simulation 25-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 313.50 1 0.58 0.58 0.46 0.58 0.06 0.03 313.53 2 1.15 1.73 1.73 2.19 0.23 0.12 313.62 3 1.73 2.89 3.67 4.62 0.47 0.25 313.75 4 2.31 4.04 6.52 7.71 0.60 0.28 313.78 5 2.89 5.20 10.20 11.72 0.76 0.32 313.82 6 3.46 6.35 14.65 16.55 0.95 0.37 313.87 7 4.04 7.51 19.83 22.16 1.17 0.41 313.91 8 4.62 8.66 25.70 28.49 1.39 0.46 313.96 9 5.20 9.82 32.22 35.51 1.65 0.50 314.00 10 5.77 10.97 39.33 43.19 1.93 0.54 314.04 11 5.48 11.26 46.20 50.59 2.20 0.58 314.08 12 5.20 10.68 52.03 56.88 2.42 0.61 314.11 13 4.91 10.10 56.93 62.14 2.60 0.63 314.13 14 4.62 9.53 60.97 66.46 2.75 0.65 314.15 15 4.33 8.95 64.19 69.91 2.86 0.66 314.16 16 4.04 8.37 66.65 72.56 2.95 0.67 314.17 17 3.75 7.79 68.40 74.44 3.02 0.68 314.18 18 3.46 7.22 69.50 75.62 3.06 0.68 314.18 19 3.18 6.64 69.99 76.14 3.08 0.69 314.19 20 2.89 6.06 69.91 76.05 3.07 0.68 314.18 21 2.60 5.48 69.29 75.39 3.05 0.68 314.18 22 2.31 4.91 68.18 74.20 3.01 0.68 314.18 23 2.02 4.33 66.60 72.51 2.95 0.67 314.17 24 1.73 3.75 64.59 70.35 2.88 0.66 314.16 25 1.44 3.18 62.19 67.77 2.79 0.65 314.15 26 1.15 2.60 59.40 64.78 2.69 0.64 314.14 27 0.87 2.02 56.27 61.42 2.58 0.63 314.13 28 0.58 1.44 52.81 57.71 2.45 0.61 314.11 29 0.29 0.87 49.06 53.68 2.31 0.60 314.10 30 0.00 0.29 45.04 49.34 2.15 0.57 314.07 31 0.00 0.00 41.05 45.04 2.00 0.55 314.05 32 0.00 0.00 37.35 41.05 1.85 0.53 314.03 33 0.00 0.00 33.92 37.35 1.71 0.51 314.01 34 0.00 0.00 30.74 33.92 1.59 0.49 313.99 35 0.00 0.00 27.79 30.74 1.48 0.47 313.97 36 0.00 0.00 25.05 27.79 1.37 0.45 313.95 37 0.00 0.00 22.51 25.05 1.27 0.43 313.93 38 0.00 0.00 20.16 22.51 1.18 0.42 313.92 39 0.00 0.00 17.97 20.16 1.09 0.40 313.90 40 0.00 0.00 15.95 17.97 1.01 0.38 313.88 41 0.00 0.00 14.10 15.95 0.93 0.36 313.86 42 0.00 0.00 12.40 14.10 0.85 0.34 313.84 43 0.00 0.00 10.83 12.40 0.78 0.33 313.83 44 0.00 0.00 9.39 10.83 0.72 0.31 313.81 45 0.00 0.00 8.06 9.39 0.66 0.30 313.80 Garrett Engineering. 4444 carter Creek Parkway Suite 108 · Bryan. Texas 77802 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 2B 46 0.00 0.00 6.84 8.06 0.61 0.29 313.79 47 0.00 0.00 5.72 6.84 0.56 0.27 313.77 48 0.00 0.00 4.68 5.72 0.52 0.26 313.76 49 0.00 0.00 3.73 4.68 0.48 0.25 313.75 50 0.00 0.00 2.95 3.73 0.39 0.21 313.71 51 0.00 0.00 2.33 2.95 0.31 0.17 313.67 52 0.00 0.00 1.84 2.33 0.24 0.13 313.63 53 0.00 0.00 1.45 1.84 0.19 0.10 313.60 54 0.00 0.00 1.15 1.45 0.15 0.08 313.58 55 0.00 0.00 0.91 1.15 0.12 0.06 313.56 56 0.00 0.00 0.72 0.91 0.10 0.05 313.55 57 0.00 0.00 0.57 0.72 0.08 0.04 313.54 58 0.00 0.00 0.45 0.57 0.06 0.03 313.53 59 0.00 0.00 0.35 0.45 0.05 0.03 313.53 60 0.00 0.00 0.28 0.35 0.04 0.02 313.52 Garrett Engineering -4444 Carter Creek Part<way Suite 108 -Bryan. Texas 77802 -Telephone: (979) 646-2668 -Fax: (979) 646-3094 -Page 29 Inflow/Outflow Simulation 25-Year Storm Event •' 6.00 I \ \ 5.00 \ \ -"'t:I I \ c 0 u Q) \ V> 4 .00 ... Q) ll. I \ -Q) Q) ..... u .Q ::::s 0 3 .00 -~ 0 :;: -::::s 0 2.00 0 10 20 30 40 50 60 70 T ime (Minu tes) ---Pre -Deve lop me nt Hydrograph • • • Post -Development Outflow Hydrograph Without Detention -----·Post -Development 'Free -Flow ' ---Post-Developme nt Outflow With Detention Ga""tt Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-26BB · Fax : (979) 846-3094 · Page 30 Inflow I Outflow Simulation 50-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 313.50 1 0.65 0.65 0.52 0.65 0.07 0.04 313.54 2 1.31 1.96 1.95 2.47 0.26 0.14 313.64 3 1.96 3.26 4.22 5.22 0.50 0.26 313.76 4 2.61 4.57 7.51 8.79 0.64 0.29 313.79 5 3.26 5.87 11.74 13.39 0.82 0.34 313.84 6 3.92 7.18 16.83 18.92 1.04 0.39 313.89 7 4.57 8.48 22.76 25.31 1.28 0.43 313.93 8 5.22 9.79 29.46 32.55 1.54 0.48 313.98 9 5.87 11.10 36.90 40.56 1.83 0.53 314.03 10 6.53 12.40 44.99 49.30 2.15 0.57 314.07 11 6.20 12.73 52.82 57.72 2.45 0.61 314.11 12 5.87 12.07 59.51 64.89 2.69 0.64 314.14 13 5.55 11.42 65.13 70.93 2.90 0.66 314.16 14 5.22 10.77 69.76 75.90 3.07 0.68 314.18 15 4.90 10.12 73.47 79.88 3.20 0.70 314.20 16 4.57 9.46 76.32 82.93 3.31 0.71 314.21 17 4.24 8.81 78.37 85.13 3.38 0.72 314.22 18 3.92 8.16 79.67 86.53 3.43 0.73 314.23 19 3.59 7.51 80.27 87.17 3.45 0.73 314.23 20 3.26 6.85 80.23 87.13 3.45 0.73 314.23 21 2.94 6.20 79.58 86.43 3.43 0.73 314.23 22 2.61 5.55 78.36 85.12 3.38 0.72 314.22 23 2.28 4.90 76.62 83.26 3.32 0.71 314.21 24 1.96 4.24 74.39 80.86 3.24 0.70 314.20 25 1.63 3.59 71.70 "77.98 3.14 0.69 314.19 26 1.31 2.94 68.59 74.64 3.03 0.68 314.18 27 0.98 2.28 65.08 70.87 2.90 0.66 314.16 28 0.65 1.63 61.20 66.71 2.76 0.65 314.15 29 0.33 0.98 56.97 62.18 2.60 0.63 314.13 30 0.00 0.33 52.43 57.30 2.44 0.61 314.11 31 0.00 0.00 47.89 52.43 2.27 0.59 314.09 32 0.00 0.00 43.69 47.89 2.10 0.57 314.07 33 0.00 0.00 39.80 43.69 1.95 0.54 314.04 34 0.00 0.00 36.19 39.80 1.80 0.52 314.02 35 0.00 0.00 32.85 36.19 1.67 0.50 314.00 36 0.00 0.00 29.75 32.85 1.55 0.48 313.98 37 0.00 0.00 26.87 29.75 1.44 0.46 313.96 38 0.00 0.00 24.20 26.87 1.34 0.44 313.94 39 0.00 0.00 21.72 24.20 1.24 0.43 313.93 40 0.00 0.00 19.42 21.72 1.15 0.41 313.91 41 0.00 0.00 17.29 19.42 1.06 0.40 313.90 42 0.00 0.00 15.33 17.29 0.98 0.37 313.87 43 0.00 0.00 13.53 15.33 0.90 0.36 313.86 44 0.00 0.00 11.87 13.53 0.83 0.34 313.84 45 0.00 0.00 10.34 11.87 0.76 0.32 313.82 Garrett Engi.-ri~ · 4444 Carter Creek Parl<way Suite 108 ·Bryan. Texas 7781J2 · Telepllooe: (979) 846-2688 ·Fax: (979) 846-3094 · Page 31 46 0.00 0.00 8.94 10.34 0.70 0.31 313.81 47 0.00 0.00 7.65 8.94 0.65 0.29 313.79 48 0.00 0.00 6.46 7.65 0.59 0.28 313.78 49 0.00 0.00 5.37 6.46 0.55 0.27 313.77 50 0.00 0.00 4.36 5.37 0.50 0.26 313.76 51 0.00 0.00 3.45 4.36 0.46 0.25 313.75 52 0.00 0.00 2.72 3.45 0.36 0.19 313.69 53 0.00 0.00 2.15 2.72 0.29 0.15 313.65 54 0.00 0.00 1.70 2.15 0.23 0.12 313.62 55 0.00 0.00 1.34 1.70 0.18 0.10 313.60 56 0.00 0.00 1.06 1.34 0.14 0.08 313.58 57 0.00 0.00 0.84 1.06 0.11 0.06 313.56 58 0.00 0.00 0.66 0.84 0.09 0.05 313.55 59 0.00 0.00 0.52 0.66 0.07 0.04 313.54 60 0.00 0.00 0.41 0.52 0.05 0.03 313.53 Garrett E1"4!ineering • 4444 Corter Creek Parllway Suite 108 ·Bryan, Texas 77602 ·Telephone: (979) 846-2668 ·Fax: (979) 846-3094 • Page 32 Inflow/Outflow Simulation 50-Year Sto r m Event 7.00 I \ I \ 6.00 \ ' I \ \ -"O 5.00 c 0 u cu V) \ ... cu 0. I \ -cu cu 4.00 ..... u :c :::s (.) -~ 0 ;;:::: 3 .00 -:::s 0 0 10 20 30 40 50 60 70 Time (Mi nutes ) ---Pre-Development Hydrograph • • • Post -Development Outflow Hydrograph Witho ut Detention -----·Post-Develo pm ent 'Free -Fl ow' ---Post-Develop ment Outflow With Detention Garrett Engineering · 4444 Garter Creek Parl<way Suite 108 ·Bryan , Texas 77802 ·Telephone : (979) 846-2688 ·Fax: (979) 846-3094 • Page 33 Inflow I Outflow Simulation 100-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 313.50 1 0.68 0.68 0.54 0.68 0.07 0.04 313.54 2 1.36 2.04 2.04 2.58 0.27 0.15 313.65 3 2.04 3.41 4.44 5.45 0.51 0.26 313.76 4 2.73 4.77 7.89 9.21 0.66 0.30 313.80 5 3.41 6.13 12.33 14.03 0.85 0.34 313.84 6 4.09 7.50 17.66 19.82 1.08 0.40 313.90 7 4.77 8.86 23.87 26.52 1.32 0.44 313.94 8 5.45 10.22 30.90 34.10 1.60 0.49 313.99 9 6.13 11.58 38.68 42.49 1.90 0.54 314.04 10 6.81 12.95 47.16 51.63 2.24 0.59 314.09 11, 6.47 13.29 55.36 60.45 2.54 0.62 314.12 12 6.13 12.61 62.37 67.97 2.80 0.65 314.15 13 5.79 11.93 68.27 74.29 3.01 0.68 314.18 14 5.45 11.24 73.13 79.51 3.19 0.70 314.20 15 5.11 10.56 77.03 83.69 3.33 0.71 314.21 16 4.77 9.88 80.02 86.91 3.44 0.73 314.23 17 4.43 9.20 82.18 89.22 3.52 0.74 314.24 18 4.09 8.52 83.56 90.70 3.57 0.74 314.24 19 3.75 7.84 84.21 91.39 3.59 0.75 314.25 20 3.41 7.16 84.17 91.36 3.59 0.75 314.25 21 3.07 6.47 83.51 90.65 3.57 0.74 314.24 22 2.73 5.79 82.26 89.30 3.52 0.74 314.24 23 2.39 5.11 80.45 87.37 3.46 0.73 314.23 24 2.04 4.43 78.14 84.88 3.37 0.72 314.22 25 1.70 3.75 75.34 81.88 3.27 0.71 314.21 26 1.36 3.07 72.10 78.41 3.15 0.69 314.19 27 1.02 2.39 68.45 74.49 3.02 0.68 314.18 28 0.68 1.70 64.40 70.15 2.87 0.66 314.16 29 0.34 1.02 60.00 65.43 2.71 0.64 314.14 30 0.00 0.34 55.26 60.34 2.54 0.62 314.12 31 0.00 0.00 50.53 55.26 2.37 0.60 314.10 32 0.00 0.00 46.13 50.53 2.20 0.58 314.08 33 0.00 0.00 42.06 46.13 2.04 0.56 314.06 34 0.00 0.00 38.29 42.06 1.89 0.53 314.03 35 0.00 0.00 34.79 38.29 1.75 0.51 314.01 36 0.00 0.00 31.55 34.79 1.62 0.50 314.00 37 0.00 0.00 28.54 31.55 1.50 0.47 313.97 38 0.00 0.00 25.75 28.54 1.40 0.46 313.96 39 0.00 0.00 23.16 25.75 1.30 0.44 313.94 40 0.00 0.00 20.76 23.16 1.20 0.42 313.92 41 0.00 0.00 18.53 20.76 1.11 0.41 313.91 42 0.00 0.00 16.47 18.53 1.03 0.39 313.89 43 0.00 0.00 14.57 16.47 0.95 0.37 313.87 44 0.00 0.00 12.83 14.57 0.87 0.35 313.85 45 0.00 0.00 11.23 12.83 0.80 0.33 313.83 Gam!lt Engineering. 4444 carter C<eel< Parkway Suite 108 · Bryan, Texas 778C2 • Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 34 46 0.00 0.00 9.75 11.23 0.74 0.32 313.82 47 0.00 0.00 8.40 9.75 0.68 0.30 313.80 48 0.00 0.00 7.15 8.40 0.62 0.29 313.79 49 0.00 0.00 6.00 7.15 0.57 0.28 313.78 50 0.00 0.00 4.95 6.00 0.53 0.27 313.77 51 0.00 0.00 3.97 4.95 0.49 0.26 313.76 52 0.00 0.00 3.14 3.97 0.42 0.22 313.72 53 0.00 0.00 2.48 3.14 0.33 0.18 313.68 54 0.00 0.00 1.96 2.48 0.26 0.14 313.64 55 0.00 0.00 1.55 1.96 0.21 0.11 313.61 56 0.00 0.00 1.22 1.55 0.16 0.09 313.59 57 0.00 0.00 0.96 1.22 0.13 0.07 313.57 58 0.00 0.00 0.76 0.96 0.10 0.05 313.55 59 0.00 0.00 0.60 0.76 0.08 0.04 313.54 60 0.00 0.00 0.48 0.60 0.06 0.03 313.53 Garrett Engineering . 4444 Garter Creek Part<way Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 -Fax: (979) 846-3094 -Page 35 -"t:J c 0 u Q) (/) ... Q) Q. -Q) Q) ..... u ..c :J (.) -~ 0 :;: -:J 0 7.00 6 .00 5 .00 4 .00 3 .00 0 ' ' ' ' ' ' ' ' ' ' Inflow/Outflow Simulation 100-Year Storm Event ' ' ' \ \ \ ' \ \ \ \ \ 10 20 30 40 50 60 70 Time (Minutes) ---Pre-Development Hydrograph - - -Post -Development Outflow Hydrograph Without Detention ---Po st -Development Outflow Wit h Detention -----·Post -Development "Free-F low " Garrett E~neeri~. 4444 Carter Greek Par1<way Suite 108 · Bryan , Texas 7781J2 • Telephone: (979) 846-2688 · Fax: (979) 646-3094 · Page 36 Inflow/Outflow Simulation 2-Year Storm Event -"O c 0 u 1.50 G> en ... G> D.. -G> G> .... u ,g ::s 0 -~ 0 1.00 :;: -::s 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Development Hydrograp h -Total Pos t -Development Hydrograph Garrett Er41ineering . 4444 Carter Creek Parl<way Suite 108 . Bryan, Texas 77802 • Telephone: (979) 846-2688 • Fax: (979) 846-3094 · Page 37 --0 c 0 u Q) (/) ... Q) Q.. -Q) Inflow/Outflow Simulation 5-Year Storm Event ~ 1.50-r-~~;--.--r~~~~-r-t-~~~~-t----~~~~+-~~~~-+-~~~~---4~~~~~ u ,g ::I (.) -~ 0 :;: -::I 0 0 10 20 30 40 50 60 70 T ime (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Garrett E~neering . 4444 carter Cteek Parkway Suite 108 . Btyan, Texas 77002 · Telephooe : (979) 846-2688 · Fax: (979) 846-3094 · Page 38 9 -"Cl c 0 u Q) II) ... Q) CL. -Q) Q) LI. u .Q ::3 u Inflow/Outflow Simu lati on 10-Year Storm Event 2.00 'i' l.50~-~-t---iw---r-~~~~-J1-~~~~-r---1r-~~---t-~~~~--1-~~~~--+~~~~-J 0 ;:;:::: -::3 0 0 10 20 30 40 50 60 70 T ime (Minut es) --Pre -Develop ment Hydrograph -Tot al Po st -Development Hydrograph Garrett Engineering . 4444 carter Creek Par11way Suite 108 · Biyan, Texas 77802 • Telephone: (979) 846-2688 • fax: (979) 846-3094 · Page 39 Inflow/Outflow Simulation 25-Year Storm Event -'i::I 2 .50 c 0 u QI (/) ... QI ll. -QI QI 2 .00 ..... u ..Q ::::s 0 -~ 0 :;: -1.50 ::::s 0 0.00+-~~~--t~~~~...-~~~~---~~~-..~~~~..-~~~ ...... ~~~~~ . 0 10 20 30 40 50 60 7 0 Time (Minutes) --Pre-Devel opment Hydrograph -Total Post-Development Hydrograph Garrett Engineering . 4444 carter Creek Parkway Suite 108 ·Bryan , Texas 77002 ·Telephone: (979) 846-2688 -Fax: (979) 846-3094 · Page 40 Inflow/Outflow Simulation SO-Year Storm Event 3.00 -"O c 0 u Cll (/) ... 2.50 Cll ~ -Cll Cll ..... u :c = 2 .00 (.) -~ 0 :: -= 0 1.50 0 10 20 30 40 50 60 70 Time (Minutes ) --Pre-Development Hydrograph -Total Post-Dev elopment Hydrograph Garrett Engineering . 4444 carter Creek Parl<way Suite 108 . Bryan , Texas 77802 . Telephone : (979) 846-2688 . Fax: (979) 846-3094 · Page 41 Inflow/Outflow Simul ation 10 0-Year St or m Ev en t 3.00 -~ c 0 u Q) en ... 2.50 Q) D.. -Q) Q) ..... u ..Q :I 2.00 (.) -~ 0 :;: -:I 0 1.50 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Development Hydrograph -Total Post -Development Hydrograph Garrett Ercineering -4444 Carter Creek Parl<way Suite 108 ·Bryan, Texas 77802 ·Telephone: (979) 846-2688 ·Fax: (9 79) 846-3094 · Page 42 Detention Pond Storage Volumes as Percent of Maximum Volume 703 G> E :I 0 603 > E :I E ·;c 503 "' ::!: -0 -c 403 G> u ... G> Q. 303 2·year 5-year 10-year 25-year 50·year 100-year Design Storm Storm Simulation Synopsis 2-ear 5-ear 10-ear 25-ear 50-ear 100-ear Storm Depth 0.56 0.61 0.64 0 .69 0.73 0 .75 Storm Elevation 314.06 314.11 314.14 314.19 314.23 314.25 Storm Volume 1328 1633 1888 2192 2512 2634 Maximum Capacity 2669 2669 2669 2669 2669 2669 Percent of Capacity 503 613 713 823 943 993 Garrett E~neering . 4444 carter Creek Parkway Suite 108 . Bryan, Texas 77002 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 43 DRAINAGE COMPUTATIONS For Buffalo Wild Wings Bryan, Brazos County, Texas Prepared tor Charles Stone c/o C-J STONE, INC. P.O. Box 628/ 717 Ave .B Somerville , TX 77879 Tel : (979) 255-5180 Fax: (979) 596-1285 Prepared by: Garrett Engineering 4444 Carter Creek Parkway -Suite 108 Bryan, Texas 77802 Telephone : (979) 846-2688 Garrett Engineering · 4444 Carter Creek Parl<way Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 1 coDRAINAGE COMPUTATIONS for Buffalo Wild Wings College Station, Brazos County, Texas *May, 2004 * SUMMARY The proposed development is located on a 1 .38 acre tract of land being part of Lot 3C, University Park Subdivision, Phase II, vol. 5431, pg. 49. Said proposed development being in the Richard Carter League, Abstract #8, College Station, Brazos County, Texas and being situated on the north side of University Drive. See Vicinity Map. Currently the land is vacant with an access drive 21 feet wide and 236 feet long. See Survey. Two storm water detention facilities were designed to accept run-off from the entire 1.38 acre tract. Tributary A includes the two rear parking areas and the building for 0.665 acres. Tributary B includes the front and side parking areas and greenspace at the front of the property. The storm water detention facility for Tributary A is contained in the rear parking lot behind the building. As the storm water detention facility for Tributary Bis contained in the green space at the front of the propery. See Exhibit A. Detention Pond A The total tributary A consists of 0.665 acres of which 0.048 acres are impervious cover in the pre-development stage. In the post development state 0.562 acres are impervious area and 0 .103 acres are pervious. The 0.665 acre development site has 0.071 acres that are allowed to "free flow". Detention Pond A collects water flowing from 0.594 acres of the development of which 0.537 acres are impervious. See Exhibit B. Computations presented on Page 2 present the estimated pre-development peak discharge rates generated by the 2, 5, 10, 25, 50 and 100-year storm events. The pre-development run-off coefficient was assumed to be 0.51. The post development weighted run-off coefficient was assumed to be 0 .89 for the 0.665 acre tributary. Post- development hydrographs calculated on page 2 assume no detention to facilitate direct comparison in the pre-and post-development conditions. Page 3 calculates peak discharge rates for "free-flow" from the project site. The anticipated "free-flow" is 0.071 acres and having a weighted run-off coefficient of 0.65. Page 4 computes peak discharge rates for the storm water that is directed to the proposed detention pond. Pages 5-12 present tabulations for the predevelopment, post-development with no detention, "free-flow" and flow to detention pond hydrographs respectively. Pages 13-15 are hydrographs for the pre-development, post- development with no detention, "free-flow" and flow to detention pond hydrographs respectively. A minimum time of concentration (T/c) of 10 minutes is taken because it is greater than the actual T/c computed as 1.45 minutes. The calculations fort/care on Page 1. L~ \oD '~ Having derived the Preliminary volume requirements as presented on page 2 and "allowable peak" discharge rate as present on page 1 it is now possible to design the final detention facility and outlet control structure. Page 16 presents a tabulation and depth verses volume graph for the detention facility as proposed. The top of Berm is at elevation 312.50. In the 25-year strom event the elevation in the pond is 312.46 leaving 0.04 foot of "free -board". Page 17 presents a tabulation and rating curve for the proposed outlet control structure. A trapazodial weir was chosen due to the discharge ratio characteristics associated with the anticipated headwater depth. An ultimate storage depth of 9 inches or 0.75 feet is available due to the physical geometry of the pond. The flows from the trapezoidal weir were determined from the following equation, Q=Cw*[L+0 .8 *H*tan(0/2)]*H b. Where "Q " is the design discharge rate in cubic feet per second. "Cw" is the weir coefficient (2.9 for trapezoidal weir. "L" crest length in feet . "H" is the headwater depth in feet on the weir to the crest which ranges from 0 .00 ft. to a maximum of 0.75 ft . "0" is the internal angle in radians. And "b" is a constant at 1.5. Page 18 presents a tabulation of the relationship between discharge from the detention and the dimensionless quantity 2S/t-0. Also included is the Storage Indication Curve for the proposed d e tention facility based on the aforementioned physical characteristics of the detention pond, storage volume, inflow hydrographs , and rating curve for the outlet structure. The storage indication curve as shown on page 18 is a graphical solution to the equation presented as follows: 2s1 (II+ 12) + (-- - - - ---- -- dt 2s2 -0 1) = dt (---- - ------ Pages 20-22, 23-25 , 26-28, 29-31 , 32-34, and 35-37 present simulations for the 2 , 5, 10, 25, 50 and 100-year storm events. The first and second pages of each storm frequency simulation represent the tabulated data for the storm event. The third page of each storm simulation represents the pre-development hydrograph , the post-development hydrograph (with no detention), and the post development "free-flow" hydrograph for each storm event. Pages 37 -42 provide total inflow/outflow hydrographs for the 2 , 5, 10 , 25 , 50 and 100-year pre-development and post-development storm events. It can be determined from these same hydrographs that the post-development peak discharge rates have been significantly reduced from those peak pre-development discharge rates due to the incorporation of the proposed detention facility. age 43 is a graph that summates the depths, volumes, and percent of "utilized" storage volumes for the 2, 5 , 10, 25 , 50 and 100-year storm events. Detention Pond B The total tributary A consists of 0. 712 acres of which 0 .076 acres are impervious cover in the pre-development stage. In the post development state 0.584 acres are impervious area and 0 .128 acres are pervious. The 0 . 712 acre development site has 0. 071 acres that are allowed to "free flow". Detention Pond B collects water flowing from 0 .594 acres of the development of which 0 .537 acres are impervious. See Exhibit C. 2 • Computations presented on Page 2 present the estimated pre-development peak discharge rates generated by the 2, 5, 10, 25, 50 and 100-year storm events. The pre-development run-off coefficient was assumed to be 0.51. The post development weighted run-off coefficient was assumed to be 0.88 for the 0.665 acre tributary. Post- development hydrographs calculated on page 2 assume no detention to facilitate direct comparison in the pre-and post-development conditions. Page 3 calculates peak discharge rates for "free-flow" from the project site. The anticipated "free-flow" is 0.159 acres and having a weighted run-off coefficient of 0.93. Page 4 computes peak discharge rates for the storm water that is directed to the proposed detention pond. Pages 5-12 present tabulations for the predevelopment, post-development with no detention, "free-flow" and flow to detention pond hydrographs respectively. Pages 13-15 are hydrographs for the pre-development, post- development with no detention, "free-flow" and flow to detention pond hydrographs respectively. A minimum time of concentration (T/c) of 10 minutes is taken because it is greater than the actual T/c computed as 3.47 minutes. The calculations fort/care on Page 1. Having derived the Preliminary volume requirements as presented on page 2 and "allowable peak" discharge rate as present on page 1 it is now possible to design the final detention facility and outlet control structure. Page 16 presents a tabulation and depth verses volume graph for the detention facility as proposed. The top of Berm is at elevation 314.25. In the 25-year strom event the elevation in the pond is 313.48 leaving 0.77 feet or about 9 inches of "free-board". Page 17 presents a tabulation and rating curve for the proposed outlet control structure. A circular pipe culvert was chosen due to the discharge ratio characteristics associated with the anticipated headwater depth. An ultimate storage depth of 2.75 is available due to the physical geometry of the pond. The pipe diameter of 8 inches was selected. This value was determined from the following equation for headwater depth (in feet), H=[[ (2.5204 (l+K) )/D4] (466.18n2L (l+K)) /D 16/3]] x (D/10) 2. "K" is the entrance loss coefficient (K=0.50 for this case). "D" is the diameter of the pipe in feet. "L" is the length of culvert in feet. "Q" is the design discharge rate in cubic feet per second. "n" is Manning's roughness coefficient (n=0.013 for RCP pipe), and "H" is the headwater depth in feet which ranges from 0.00 ft. to a maximum of 2. 75 ft. Page 18 presents a tabulation of the relationship between discharge from the detention and the dimensionless quantity 2S/t-O. Also included is the Storage Indication Curve for the proposed detention facility based on the aforementioned physical characteristics of the detention pond, storage volume, inflow hydrographs, and rating curve for the outlet structure. Page 18 presents a tabulation of the relationship between discharge from the detention and the dimensionless quantity 2S/t-0. Also included is the Storage Indication Curve for the proposed detention facility based on the aforementioned physical characteristics of the detention pond, storage volume, inflow hydrographs, and rating curve for the outlet structure. The storage indication curve as shown on page 18 is a graphical solution to the equation presented as follows: 3 2s1 (II+ I2) + (-- - ---- - - - - 2s2 -0 1) (-- --- ------+ 02) dt dt Pages 20-22, 23-25, 26-28, 29-31, 32-34, and 35-37 present simulations for the 2, 5, 10, 25, 50 and 100-year storm events. The first and second pages of each storm frequency simulation represent the tabulated data for the storm event. The third page of each storm simulation represents the pre-development hydrograph, the post-development hydrograph (with no detention), and the post development "free-flow" hydrograph for each storm event. Pages 37 -42 provide total inflow/outflow hydrographs for the 2, 5, 10, 25, 50 and 100-year pre-development and post-development storm events. It can be determined from these same hydrographs that the post-development peak discharge rates have been significantly reduced from those peak pre-development discharge rates due to the incorporation of the proposed detention facility. Page 43 is a graph that summates the depths, volumes, and percent of "utilized" storage volumes for the 2, 5, 10, 25, 50 and 100-year storm events. Findings: The construction of the proposed detention facilities will minimize the effects of this development on the downstream property owners and will decrease the peak discharge rates for the range of storm events of interest within this report. 4 / c 0 • (fJ ·-...µ • r • 0 0 0 z _J I ...µ 0 (I) ·~ ~ ~ ' 0 s L o_ Determine Total Pre-Development Peak Storm Water Discharge Rates Tri butary Area ("A"): 0 .665 Pervi ous Area : Impervious Area : Run-Off Coefficient ("Cwt"): Time Of Conce ntration ("T /c"): Woodl a nd s: Pa stures: Pavem e nts: Hourly Intensity Rates ("I"): Peak Discharge Rate ("Q "): Acres 0 .51 0 .617 0.048 10.00 Low Elevation: High Elevation: Distance (Feet): Slope(% Grade): Velocity ("Vw "): Time: Low Elevation: High Elevation: Distance (Feet): Slope(% Grade): Velocity ("Vp"): Time: Low Elevation: High Elevation : Distance (Feet): Slope(% Grade): Acres Acres Velocity ("Vpave "): Time: TotalTra vel Time: Use Min. Travel Time: 2-Year: 6 .33 5 -Year: 7 .69 10-Year: 8.63 25 -Year : 9.86 50 -Year : 11.15 100-Year: 11.64 2 -Year : 2 .13 5-Year: 2.59 10-Year: 2 .91 25 -Year: 3.32 50 -Year : 3.75 100-Year: 3 .92 c = 0.47 c = 0.97 311.00 318.50 180.58 4.15 2.08 Feet I Second 1.45 Minutes 0.00 0.00 0.00 0 .00 0.00 Feet I Second 0.00 Minutes 0 .00 0 .00 0 .00 0.00 0.00 Feet I Second 0 .00 Minutes 1.45 Minutes 10.00 Minutes Inches I Hour In ches I Hour In c hes I Hour Inches I Hour Inches I Hour Inches I Hour Cub ic Feet I Second Cubic Feet I Second Cubic Feet I Second Cu b ic Feet I Second Cubic Feet I Second Cu bic Feet I Second Garrett Engineering . 4444 Carter Creek Parl<way Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 · Fax: (979) 846·3094 · Page 2 Determine Post-development Peak Storm Water Discharge (No Detention) Tributary Area ("A"): 0 .665 Pervious Area: Impervious Area : Run-Off Coefficient ("Cwt "): Acres 0 .89 0.103 0.562 Acres Acres c = 0 .46 c = 0 .97 Time Of Concentration ("T /c"): 10.00 Minutes Hourly Intensity Rates ("I"): 2 -Year: 5-Year: 10-Year: 25 -Year: 50 -Year: 100-Year: Peak Discharge Rate ("Q"): 2-Year: 5 -Year: 10-Year: 25-Year: 50 -Year : 100-Year: Comparison Of Predevelopment And Post-development Peak Discharge Rates 6 .33 Inches I Hour 7.69 Inches I Hour 8.63 Inches I Hour 9 .86 Inches I Hour 11.15 Inches I Hour 11.64 Inches I Hour 3.75 Cubic Feet I Second 4 .56 Cubic Feet I Second 5 .12 Cubic Feet I Second 5.84 Cubic Feet I Second 6 .61 Cubic Feet I Second 6.90 Cubic Feet I Second Predevelopment Post-Development Increase 2-Year: 5-Year: 10 -Year: 25 -Year: 50 -Year : 100-Year: 2 .13 Ft3/sec 2 .59 Ft3/sec 2 .91 Ft3/sec 3 .32 Ft3/sec 3. 75 Ft3/sec 3 .92 Ft3/sec Preliminary Determination Of Detention Pond Volume 2-Year: 1.62 Ft3/sec x (30 Min. 5-Year: 1.97 Ft3/sec x (30 Min. 10-Year : 2 .21 Ft3/sec x (30 Mi n. 25 -Year : 2 .52 Ft3/sec x (30 Min . 50 -Year: 2.85 Ft3/sec x (30 Min . 100-Year: 2.98 Ft3/sec x (30 Min. x 60 Sec . x 60 Sec. x 60 Sec. x 60 Sec. x 60 Sec. x 60 Sec. 3.75 Ft3/sec 4 .56 Ft3/sec 5.12 Ft3/sec 5.84 Ft3/sec 6.61 Ft3/sec 6 .90 Ft3/sec I 2 ) = I 2 )= I 2 )= I 2 )= I 2 )= I 2 )= Time Base (Tb)= 3.00 x T /c And Time Of Concentration (T /c) Of 10 Minutes. 1.62 Ft3/sec 1.97 Ft3/sec 2.21 Ft3/sec 2.52 Ft3/sec 2.85 Ft3/sec 2 .98 Ft3/sec 1,457 Cubic 1,772 Cub ic 1,989 Cubic 2 ,271 Cubic 2 ,567 Cubic 2 ,680 Cubic Garrett Engineering . 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 . Telephone : (979) 846-2688 . Fax: (979) 846-3094 . Page 3 Feet Feet Feet Feet Feet Feet Determine Post-Development "Free-Flow" Peak Storm Water Dischar2e Tributary Area ("A "): 0.071 Pervious Area : Impervious Area : Run-Off Coefficient ("Cwt "): Acres 0 .65 0 .045 0 .026 Acres Acres Time Of Concentrat ion ("T /c"): 10.00 Mi nutes (Min .) Hourly Intens ity Ra t es ("I"): 2 -Year: 6 .33 5-Year : 7 .69 10-Year: 8 .63 25-Year: 9.86 50-Year : 11.15 100-Year : 11.64 Peak Discharge Rate ("Q"): 2 -Year: 0.29 5 -Year: 0.36 10-Year: 0.40 25 -Year: 0 .46 50-Year: 0 .52 100-Year: 0 .54 c = 0 .47 c = 0 .97 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Garrett Engineering . 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 · Telephone : (979) 846-2688 -Fax : (979) 846-3094 · Page 4 Determine Post-Development Flow Into Detention Pond Tributary Area ("A"): 0.594 Pervious Area: Impervious Area: Run -Off Coefficient ("Cwt"): Time Of Concentration ("T /c"): Hourly Intensity Rates ("I"): Peak Discharge Rate ("Q"): Acres 0 .92 0.056 0.537 Acres Acres 10.00 Minutes 2 -Year: 6.33 5-Year: 7.69 10-Year: 8.63 25-Year: 9.86 50·Year: 11.15 100-Year: 11.64 2 -Year : 3.47 5-Year: 4 .21 10-Year: 4.73 25·Year: 5 .40 50·Year : 6.11 100-Year : 6.38 c = 0.47 c = 0 .97 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Garrett Engineering . 4444 Carter Creek Parkway Surte 108 . Bryan , Texas 77802 ·Telephone: (979) 846-2688 -Fax : (979) 846-3094 · Page 5 Pre-Development Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year ~Minutes2 Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.21 0.26 0.29 0.33 0.38 0.39 2 0.43 0.52 0.58 0.66 0.75 0.78 3 0.64 0.78 0.87 1.00 1.13 1.18 4 0.85 1.04 1.16 1.33 1.50 1.57 5 1.06 1.29 1.45 1.66 1.88 1.96 6 1.28 1.55 1.74 1.99 2.25 2.35 7 1.49 1.81 2.03 2.32 2.63 2.74 8 1.70 2.07 2.33 2.66 3.00 3.13 9 1.92 2.33 2.62 2.99 3.38 3.53 11 2.02 2.46 2.76 3.15 3.56 3.72 12 1.92 2.33 2.62 2.99 3.38 3.53 13 1.81 2.20 2.47 2.82 3.19 3.33 14 1.70 2.07 2.33 2.66 3.00 3.13 15 1.60 1.94 2.18 2.49 2.81 2.94 16 1.49 1.81 2.03 2.32 2.63 2.74 17 1.38 1.68 1.89 2.16 2.44 2.55 18 1.28 1.55 1.74 1.99 2.25 2.35 19 1.17 1.42 1.60 1.83 2.06 2.15 20 1.06 1.29 1.45 1.66 1.88 1.96 21 0.96 1.17 1.31 1.49 1.69 1.76 22 0.85 1.04 1.16 1.33 1.50 1.57 23 0.75 0.91 1.02 1.16 1.31 1.37 24 0.64 0.78 0.87 1.00 1.13 1.18 25 0.53 0.65 0.73 0.83 0.94 0.98 26 0.43 0.52 0.58 0.66 0.75 0.78 27 0.32 0.39 0.44 0.50 0.56 0.59 28 0.21 0.26 0.29 0.33 0.38 0.39 29 0.11 0.13 0.15 0.17 0.19 0.20 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering -4444 carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 · Fax: (979) 846-3094 -Page 6 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering. 4444 carter Creek Parkway Suite 108 . Bryan, Texas 77802 • Telephone: (979) 846-2688 • Fax: (979) 846-3094 · Page 7 Post-Development Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.37 0.46 0.51 0.58 0.66 0.69 2 0.75 0.91 1.02 1.17 1.32 1.38 3 1.12 1.37 1.53 1.75 1.98 2.07 4 1.50 1.82 2.05 2.34 2.64 2.76 5 1.87 2.28 2.56 2.92 3.30 3.45 6 2.25 2.73 3.07 3.51 3.96 4.14 7 2.62 3.19 3.58 4.09 4.62 4.83 8 3.00 3.65 4.09 4.67 5.28 5.52 9 3.37 4.10 4.60 5.26 5.94 6.21 11 3.56 4.33 4.86 5.55 6.27 6.55 12 3.37 4.10 4.60 5.26 5.94 6.21 13 3.19 3.87 4.35 4.97 5.61 5.86 14 3.00 3.65 4.09 4.67 5.28 5.52 15 2.81 3.42 3.84 4.38 4.95 5.17 16 2.62 3.19 3.58 4.09 4.62 4.83 17 2.44 2.96 3.33 3.80 4.29 4.48 18 2.25 2.73 3.07 3.51 3.96 4.14 19 2.06 2.51 2.81 3.21 3.63 3.79 20 1.87 2.28 2.56 2.92 3.30 3.45 21 1.69 2.05 2.30 2.63 2.97 3.10 22 1.50 1.82 2.05 2.34 2.64 2.76 23 1.31 1.60 1.79 2.05 2.31 2.41 24 1.12 1.37 1.53 1.75 1.98 2.07 25 0.94 1.14 1.28 1.46 1.65 1.72 26 0.75 0.91 1.02 1.17 1.32 1.38 27 0.56 0.68 0.77 0.88 0.99 1.03 28 0.37 0.46 0.51 0.58 0.66 0.69 29 0.19 0.23 0.26 0.29 0.33 0.34 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering . 4444 Carter Creek Par1<way Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 8 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering -4444 Carter Creek Parl<way Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 -Page 9 Post-Development "Free-Flow" Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.03 0.04 0.04 0.05 0.05 0.05 2 0.06 0.07 0.08 0.09 0.10 0.11 3 0.09 0.11 0.12 0.14 0.16 0.16 4 0.12 0.14 0.16 0.18 0.21 0.22 5 0.15 0.18 0.20 0.23 0.26 0.27 6 0.18 0.21 0.24 0.27 0.31 0.32 7 0.21 0.25 0.28 0.32 0.36 0.38 8 0.23 0.29 0.32 0.37 0.41 0.43 9 0.26 0.32 0.36 0.41 0.47 0.49 11 0.28 0.34 0.38 0.43 0.49 0.51 12 0.26 0.32 0.36 0.41 0.47 0.49 13 0.25 0.30 0.34 0.39 0.44 0.46 14 0.23 0.29 0.32 0.37 0.41 0.43 15 0.22 0.27 0.30 0.34 0.39 0.40 16 0.21 0.25 0.28 0.32 0.36 0.38 17 0.19 0.23 0.26 0.30 0.34 0.35 18 0.18 0.21 0.24 0.27 0.31 0.32 19 0.16 0.20 0.22 0.25 0.28 0.30 20 0.15 0.18 0.20 0.23 0.26 0.27 21 0.13 0.16 0.18 0.21 0.23 0.24 22 0.12 0.14 0.16 0.18 0.21 0.22 23 0.10 0.12 0.14 0.16 0.18 0.19 24 0.09 0.11 0.12 0.14 0.16 0.16 25 0.07 0.09 0.10 0.11 0.13 0.13 26 0.06 0.07 0.08 0.09 0.10 0.11 27 0.04 0.05 0.06 0.07 0.08 0.08 28 0.03 0.04 0.04 0.05 0.05 0.05 29 0.01 0.02 0.02 0.02 0.03 0.03 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering -4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone: (979) B46-268B -Fax: (979) 846-3094 -Page JO 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering . 4444 carter Creek Parkway Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846·2688 · Fax: (979) 846·3094 . Page 11 Post-Development Flow Routed Through Detention Pond Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.35 0.42 0.47 0.54 0.61 0.64 2 0.69 0.84 0.95 1.08 1.22 1.28 3 1.04 1.26 1.42 1.62 1.83 1.91 4 1.39 1.69 1.89 2.16 2.44 2.55 5 1.73 2.11 2.37 2.70 3.05 3.19 6 2.08 2.53 2.84 3.24 3.66 3.83 7 2.43 2.95 3.31 3.78 4.28 4.46 8 2.77 3.37 3.78 4.32 4.89 5.10 9 3.12 3.79 4.26 4.86 5.50 5.74 11 3.29 4.00 4.49 5.13 5.80 6.06 12 3.12 3.79 4.26 4.86 5.50 5.74 13 2.95 3.58 4.02 4.59 5.19 5.42 14 2.77 3.37 3.78 4.32 4.89 5.10 15 2.60 3.16 3.55 4.05 4.58 4.78 16 2.43 2.95 3.31 3.78 4.28 4.46 17 2.25 2.74 3.07 3.51 3.97 4.14 18 2.08 2.53 2.84 3.24 3.66 3.83 19 1.91 2.32 2.60 2.97 3.36 3.51 20 1.73 2.11 2.37 2.70 3.05 3.19 21 1.56 1.90 2.13 2.43 2.75 2.87 22 1.39 1.69 1.89 2.16 2.44 2.55 23 1.21 1.48 1.66 1.89 2.14 2.23 24 1.04 1.26 1.42 1.62 1.83 1.91 25 0.87 1.05 1.18 1.35 1.53 1.59 26 0.69 0.84 0.95 1.08 1.22 1.28 27 0.52 0.63 0.71 0.81 0.92 0.96 28 0.35 0.42 0.47 0.54 0.61 0.64 29 0.17 0.21 0.24 0.27 0.31 0.32 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering . 4444 Garter Creek Parkway Suite 108 . Bryan. Texas 77802 . Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 12 ,, 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering. 4444 Carter Creek Parkway Suite 108. Bryan. Texas 77802. Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Page 13 4 .00 -"'C 3.50 r:: 0 IJ Q) 3 .00 V> ... Q) D. 2 .50 -Q) Q) I.&. 2 .00 IJ .Q ::I 1.50 (,) -Q) ~ 1.00 IQ .J: IJ Ill 0 .50 c 0 .00 5 .00 -"'C 4.50 r:: 0 IJ 4.00 Q) V> ... 3.50 Q) D. -3 .00 Q) Q) I.&. 2.50 IJ .Q 2.00 ::I (,) ';' 1.50 bl) ... 1.00 IQ .J: IJ Ill 0 .50 c 0 .00 0 Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 2-Year Storm Event 10 2 0 30 40 5 0 60 Time (Minutes) --Pre -Development Hydrograph -Total Post -Development Hydrograph Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 5-Year Storm Event I '\. I '\. I '\. I '\. I I ~ ~ \. I I ~ '\. I I " """" II ~'\. f ~ 0 10 2 0 30 40 50 60 Time (Minutes) --Pre -Development Hydrograp h -Post -Development Outf low Hydrograph Witho ut Detention Garrett Engineering . 4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone : (979) 846-2688 -Fax: (979) 846-3094 -Page 14 70 70 -"C Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 10-Year Storm Event c 8 5 .0 0 --~~~~--11~~~~~-t-~~~~~-+-~~~~--t~~~~~-+-~~~~~+-~~~~-4 Q) en .. :. 4 .0 0 --~~~--1-~1--~---~~-t-~~~~~-+-~~~~--t~~~~~-+-~~~~~+-~~~~-4 -Q) Q) ..... u 3 .00--~~-1-~~1--~~~~--+-~~~~~-+-~~~~--1~~~~~-+-~~~~~+-~~~~-4 J:I ::I ~ 2 .00--~--1-~+-~1--~~---~-t-~.-~~~-+-~~~~--t~~~~~-+-~~~~~+-~~~~-4 Q) bl) .. "' "5 l .0 0 ----1--+--~~~1--~~~~--+-~---~~~-+-~~~~--t~~~~~-+-~~~~~+-~~~~-4 Cll c 0 7 .00 -"C c 0 6 .00 u Q) en .. 5.0 0 Q) c.. -Q) 4 .0 0 Q) ..... u 10 20 30 40 50 60 Time (Minutes) --Pre -Development Hydrograph -Post -Development Outflow Hydrograph Without Detention Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 25-Year Storm Event 70 J:I 3.oo --~~#-~++~~~~~~~~~~-t-~~~~~+-~~~~--+~~~~~+--~~~~_, ::I u -~ 2 .00 .. "' -5 i .oo--_,__,..__~~-t-~~~~~-+-~---~.--+~~~~~-t--~~~~--+~~~~~+--~~~~_, Cll Q 0 .00+-~~~~+-~~~~ ..... ~~~ ...... ~~~~ ..... ~~~~-+~~~~ ..... ~~~~~ 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Deve lopment Hydrograph -Post -Developme nt Outf low Hydrograph Without Detent ion Garrett Engineering . 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77002 · Telephone : (979) 846-2688 -Fax: (979) 846-3094 · Page 15 -"C c 0 u Cl> en ... Cl> 0.. - 7 .00 6 .00 5.00 Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 50-Year Storm Event ~ 4.oo--~~--~-+-~~~~-+~~~~~f--~~~~+-~~~~-+-~~~~---+-~~~~~ ..... u ~ 3 .00--~-1-~-F--+-~----~~-+---~~~~f---~~~~+-~~~~-+-~~~~---+-~~~~~ :I u -~ 2.00-----..__,.,__~-+-~~~~----~~.------~~t--~~~~+--~~~~-t-~~~~---+-~~~~---j ... cu ~ l.OO--#-+~~~-t-~~~~-r~~~--~r--~~~~+--~~~~-t-~~~~--+-~~~~---j VI i5 0 10 20 30 40 50 60 70 8.00 -"C c 7.00 0 u Cl> en 6.00 ... Cl> 0.. 5 .00 -Cl> Cl> ..... 4 .0 0 u :c :I 3.00 u -Cl> ~ 2.00 cu .1: u 1.00 VI i5 0.00 Time (Minutes) --Pre .Deve lopment Hydrograph -Post ·Develop m ent Outflow Hy drograph Without Detention Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 100-Year Storm Event j " I "' I "' I I ~ ' ~ // ~ "' // ~"' // ~ 0 10 20 30 40 50 60 Time (Minutes) --Pre.Development Hydrograph -Post .Development Outflow Hydrograph Without Detention Garrett Engineeri ng . 4444 carter Cree k Parkway Suite 108 · Bryan, Texas 77802 • Telephone: (979) 846-2688 · Fax: (979 ) 846-3094 · Page 16 7( I Detention Pond Depth Vs. Volume --IV IV ..... Elevation 311 .75 311.90 312 .00 312 .15 312 .25 312.50 Depth (Feet) 0 .00 0 .15 0 .25 0.40 0 .50 0 .75 Volume (Ft3) 0 30 185 627 1058 2308 Detention Pond Depth Vs. Volume -;; 0.40--~~~~~~--+-~-1"--~~~~-1-~~~~~~--l~~~~~~~+-~~~~~----4 -c. IV Q 0 500 1000 1500 2000 2500 Detention Pond Volume (Cubic Feet) Trapezoidal Garrett Engineering · 4444 Carter Creek Parl<way Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 17 Rating Curve For Outlet Control Structure De th Vs. Volume Elevation 311.75 311 .90 312 .00 312.15 312.25 312 .50 Depth (Feet) 0 .00 0.15 0.25 0.40 0.50 0 .75 Weir 0 .75 Discharge Ft3/Sec 0 0 .00 0 .16 0.39 0.93 1.43 3 .24 inches Rating Curve For Outlet Control Structure Depth Vs. Volume --Q) Q) ..... ;;-0.40+-~~~~-+-~~~~,.:+~~~~--+~~~~~1--~~~~+-~~~~-t-~~~~~ -c.. Q) Q o.oo .... ~~~~+-~~~~+-~~~~+-~~~~+-~~~~+-~~~~+-~~~---t 0.00 0.50 1.00 1.50 2.00 2 .50 3 .00 3 .50 Discharge (Cubic Feet Per Second) Garrett Elliineering . 4444 Carter Creek Parkway Suite 108 . Bryan, Texas 77802 · Telephone: (979) 846·2688 · Fa x: (979) 846·3094 · Pase 18 !Storage Indication Curve -"a c 0 <.I Cl) V> ... 3 .50 3 .00 2.50 :.. 2 .00 -Cl) Cl) ..... <.I .c :I ~ 1.50 Cl) b.o ... "' .c <.I Ill 0 1.00 0.50 Depth (Feet) 0.00 0.15 0.25 0 .40 0 .50 0 .75 / ~ Storage Discharge 2s/t 2s/t+O (Ft3) (Ft3/Sec) (Ft3/Sec) (Ft3/Sec) 0 0 .00 0.00 0.00 30 0.16 1.00 1.16 185 0 .39 6.17 6 .56 627 0 .93 20.92 21.85 1,058 1.43 35.25 36.68 2 ,308 3 .24 76.92 80.16 Storage Indication Curve / / v / V" ~ / / v v 0 .00 0 .00 10.00 20 .00 30.00 40.00 50.00 60 .00 70 .00 80 .00 2s/t+O (Cubic Feet Per Second) Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77602 ·Telephone : (979) 846-2688 ·Fax : (979) 846-3094 · Page 19 90.0( Inflow I Outflow Simulation 2-Year Storm Event Time Inflow 11+ 12 2s/t-0 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.75 0.35 0.35 0.25 0.35 0.05 0.04 311.79 2 0.69 1.04 0.96 1.29 0.16 0.15 311.90 3 1.04 1.73 2.25 2.69 0.22 0.18 311.93 4 1.39 2.43 4.05 4.67 0.31 0.22 311.97 5 1.73 3.12 6.35 7.17 0.41 0.26 312.01 6 2.08 3.81 9.13 10.16 0.52 0.29 312.04 7 2.43 4.51 12.36 13.64 0.64 0.32 312.07 8 2.77 5.20 16.00 17.55 0.78 0.36 312.11 9 3.12 5.89 20.03 21.89 0.93 0.40 312.15 10 3.47 6.59 24.43 26.61 1.09 0.43 312.18 11 3.29 6.76 28.69 31.19 1.25 0.46 312.21 12 3.12 6.41 32.34 35.10 1.38 0.49 312.24 13 2.95 6.07 35.40 38.41 1.51 0.51 312.26 14 2.77 5.72 37.88 41.12 1.62 0.53 312.28 15 2.60 5.37 39.84 43.25 1.71 0.54 312.29 16 2.43 5.03 41.32 44.87 1.77 0.55 312.30 17 2.25 4.68 42.36 46.00 1.82 0.55 312.30 18 2.08 4.33 42.99 46.69 1.85 0.56 312.31 19 1.91 3.99 43.25 46.97 1.86 0.56 312.31 20 1.73 3.64 43.17 46.89 1.86 0.56 312.31 21 1.56 3.29 42.79 46.47 1.84 0.56 312.31 22 1.39 2.95 42.11 45.73 1.81 0.55 312.30 23 1.21 2.60 41.18 44.71 1.77 0.55 312.30 24 1.04 2.25 40.00 43.43 1.71 0.54 312.29 25 0.87 1.91 38.61 41.91 1.65 0.53 312.28 26 0.69 1.56 37.01 40.17 1.58 0.52 312.27 27 0.52 1.21 35.23 38.22 1.50 0.51 312.26 28 0.35 0.87 33.27 36.09 1.41 0.50 312.25 29 0.17 0.52 31.12 33.79 1.34 0.48 312.23 30 0.00 0.17 28.79 31.29 1.25 0.46 312.21 31 0.00 0.00 26.46 28.79 1.17 0.45 312.20 32 0.00 0.00 24.28 26.46 1.09 0.43 312.18 33 0.00 0.00 22.26 24.28 1.01 0.42 312.17 34 0.00 0.00 20.37 22.26 0.94 0.40 312.15 35 0.00 0.00 18.61 20.37 0.88 0.39 312.14 36 0.00 0.00 16.98 18.61 0.82 0.37 312.12 37 0.00 0.00 15.46 16.98 0.76 0.35 312.10 38 0.00 0.00 14.05 15.46 0.70 0.34 312.09 39 0.00 0.00 12.75 14.05 0.65 0.32 312.07 40 0.00 0.00 11.53 12.75 0.61 0.31 312.06 41 0.00 0.00 10.40 11.53 0.57 0.30 312.05 42 0.00 0.00 9.35 10.40 0.53 0.29 312.04 43 0.00 0.00 8.37 9.35 0.49 0.28 312.03 44 0.00 0.00 7.46 8.37 0.45 0.27 312.02 45 0.00 0.00 6.62 7.46 0.42 0.26 312.01 Garrett Engineering· 4444 Carter Creek Parl<way Suite 108 · Bryan, Texas 77802 . Telephone: (979) 846-2688 · Fax: (979) 846-3094 . Page 20 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~--- 46 0.00 0.00 5.84 6.62 0.39 0.25 312.00 47 0.00 0.00 5.12 5.84 0.36 0.24 311.99 48 0.00 0.00 4.46 5.12 0.33 0.22 311.97 49 0.00 0.00 3.86 4.46 0.30 0.21 311.96 50 0.00 0.00 3.32 3.86 0.27 0.20 311.95 51 0.00 0.00 2.81 3.32 0.25 0.19 311.94 52 0.00 0.00 2.35 2.81 0.23 0.18 311.93 53 0.00 0.00 1.93 2.35 0.21 0.17 311.92 54 0.00 0.00 1.55 1.93 0.19 0.16 311.91 55 0.00 0.00 1.20 1.55 0.18 0.16 311.91 56 0.00 0.00 0.88 1.20 0.16 0.15 311.90 57 0.00 0.00 0.64 0.88 0.12 0.11 311.86 58 0.00 0.00 0.46 0.64 0.09 0.08 311.83 59 0.00 0.00 0.33 0.46 0.06 0.06 311.81 60 0.00 0.00 0.24 0.33 0.05 0.04 311.79 Garrett Engineering· 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 ·Telephone: (979) 846-2686 ·Fax: (979) 846-3094 Page 21 -"'C c 0 u Q) (/) ... Q) D.. -Q) Q) ..... u .a :I (.) -;i 0 :;: -:I 0 Inflow/Outflow Simulation 2 -Year Storm Event I\ I \ 3 .50 I \ I \ 3 .00 \ I \ I 2 .50 \ I \ I 2 .00 1.50 0 10 20 30 40 50 6 0 70 Time (Minutes) ---Pre -Development Hydrograph ---Post -Development Outflow With Detention • • • Post .Development Outfl ow Hydrograph Without Deten tion ----Post -Development "F ree -Flow " Garrett Engineering . 4444 Garter Creek Par1<way Suite 108 ·Bryan, Texas 77802 ·Telephone: (979) 846-2688 -Fa x: (979) 846-3094 · Page 22 Inflow I Outflow Simulation 5-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.75 1 0.42 0.42 0.31 0.42 0.06 0.05 311.80 2 0.84 1.26 1.22 1.57 0.18 0.16 311.91 3 1.26 2.11 2.82 3.32 0.25 0.19 311.94 4 1.69 2.95 5.06 5.77 0.36 0.24 311.99 5 2.11 3.79 7.91 8.85 0.47 0.27 312.02 6 2.53 4.64 11.34 12.55 0.60 0.31 312.06 7 2.95 5.48 15.32 16.82 0.75 0.35 312.10 8 3.37 6.32 19.79 21.64 0.92 0.40 312.15 9 3.79 7.16 24.75 26.96 1.10 0.43 312.18 10 4.21 8.01 30.16 32.76 1.30 0.47 312.22 11 4.00 8.22 35.37 38.38 1.50 0.51 312.26 12 3.79 7.80 39.76 43.17 1.70 0.54 312.29 13 3.58 7.38 43.40 47.13 1.87 0.56 312.31 14 3.37 6.95 46.35 50.35 2.00 0.58 312.33 15 3.16 6.53 48.66 52.88 2.11 0.59 312.34 16 2.95 6.11 50.40 54.78 2.19 0.60 312.35 17 2.74 5.69 51.61 56.09 2.24 0.61 312.36 18 2.53 5.27 52.33 56.88 2.27 0.62 312.37 19 2.32 4.85 52.60 57.18 2.29 0.62 312.37 20 2.11 4.43 52.47 57.03 2.28 0.62 312.37 21 1.90 4.00 51.96 56.47 2.26 0.61 312.36 22 1.69 3.58 51.10 55.54 2.22 0.61 312.36 23 1.48 3.16 49.93 54.26 2.17 0.60 312.35 24 1.26 2.74 48.47 52.67 2.10 0.59 312.34 25 1.05 2.32 46.75 50.79 2.02 0.58 312.33 26 0.84 1.90 44.79 48.65 1.93 0.57 312.32 27 0.63 1.48 42.60 46.26 1.83 0.56 312.31 28 0.42 1.05 40.20 43.65 1.72 0.54 312.29 29 0.21 0.63 37.62 40.84 1.61 0.52 312.27 30 0.00 0.21 34.87 37.83 1.48 0.51 312.26 31 0.00 0.00 32.13 34.87 1.37 0.49 312.24 32 0.00 0.00 29.57 32.13 1.28 0.47 312.22 33 0.00 0.00 27.19 29.57 1.19 0.45 312.20 34 0.00 0.00 24.96 27.19 1.11 0.44 312.19 35 0.00 0.00 22.89 24.96 1.04 0.42 312.17 36 0.00 0.00 20.96 22.89 0.97 0.41 312.16 37 0.00 0.00 19.16 20.96 0.90 0.39 312.14 38 0.00 0.00 17.49 19.16 0.84 0.37 312.12 39 0.00 0.00 15.94 17.49 0.78 0.36 312.11 40 0.00 0.00 14.49 15.94 0.72 0.34 312.09 41 0.00 0.00 13.15 14.49 0.67 0.33 312.08 42 0.00 0.00 11.91 13.15 0.62 0.31 312.06 43 0.00 0.00 10.75 11.91 0.58 0.30 312.05 44 0.00 0.00 9.68 10.75 0.54 0.29 312.04 45 0.00 0.00 8.68 9.68 0.50 0.28 312.03 Garrett Engineering· 4444 Carter Creek Parl<way Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 23 46 0.00 0.00 7.75 8.68 0.46 0.27 312.02 47 0.00 0.00 6.88 7.75 0.43 0.26 312.01 48 0.00 0.00 6.08 6.88 0.40 0.25 312.00 49 0.00 0.00 5.34 6.08 0.37 0.24 311.99 50 0.00 0.00 4.67 5.34 0.34 0.23 311.98 51 0.00 0.00 4.05 4.67 0.31 0.22 311.97 52 0.00 0.00 3.49 4.05 0.28 0.20 311.95 53 0.00 0.00 2.97 3.49 0.26 0.19 311.94 54 0.00 0.00 2.50 2.97 0.24 0.18 311.93 55 0.00 0.00 2.06 2.50 0.22 0.17 311.92 56 0.00 0.00 1.67 2.06 0.20 0.17 311.92 57 0.00 0.00 1.31 1.67 0.18 0.16 311.91 58 0.00 0.00 0.98 1.31 0.17 0.15 311.90 59 0.00 0.00 0.71 0.98 0.13 0.13 311.88 60 0.00 0.00 0.51 0.71 0.10 0.09 311.84 Garrett Engineering· 4444 Garter Creek Parkway Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 . Page 24 4.50 4 .00 3 .50 -"1:1 c 0 u 3 .00 cu en ... cu a. -cu cu 2 .50 ~ u .c ::I (.) -~ 0 2.00 :;: -::I 0 1.50 0 Inflow/Outflow Simulation 5-Year Storm Event •' I \ ' I \ \ I \ \ I \ ' I \ 10 20 --'-Pre-Development Hydrograph Post-De velopment Outf low With Detent ion 3 0 40 50 60 70 T ime (M i nutes) Post -Development Outflow Hydrograph Without De tentior -----·Post -Development 'F ree -Flow ' Garrett Engineering . 4444 Carter Creek Parkway Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 25 Inflow I Outflow Simulation 10-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.75 0.47 0.47 0.34 0.47 0.06 0.06 311.81 2 0.95 1.42 I 1.39 1.76 0.18 0.16 311.91 3 1.42 2.37 3.22 3.76 0.27 0.20 311.95 4 1.89 3.31 5.75 6.53 0.39 0.25 312.00 5 2.37 4.26 8.99 10.01 0.51 0.28 312.03 6 2.84 5.20 12.87 14.19 0.66 0.32 312.07 7 3.31 6.15 17.36 19.02 0.83 0.37 312.12 8 3.78 7.10 22.42 24.46 1.02 0.42 312.17 9 4.26 8.04 28.01 30.46 1.22 0.46 312.21 10 4.73 8.99 34.11 37.00 1.45 0.50 312.25 11 4.49 9.22 39.91 43.33 1.71 0.54 312.29 12 4.26 8.75 44.80 48.66 1.93 0.57 312.32 13 4.02 8.28 48.85 53.08 2.12 0.59 312.34 14 3.78 7.81 52.12 56.65 2.26 0.61 312.36 15 3.55 7.33 54.69 59.46 2.38 0.63 312.38 16 3.31 6.86 56.61 61.55 2.47 0.64 312.39 17 3.07 6.39 57.94 63.00 2.53 0.65 312.40 18 2.84 5.91 58.73 63.86 2.56 0.66 312.41 19 2.60 5.44 59.01 64.17 2.58 0.66 312.41 20 2.37 4.97 58.84 63.98 2.57 0.66 312.41 21 2.13 4.49 58.25 63.33 2.54 0.65 312.40 22 1.89 4.02 57.27 62.27 2.50 0.65 312.40 23 1.66 3.55 55.94 60.82 2.44 0.64 312.39 24 1.42 3.07 54.29 59.02 2.36 0.63 312.38 25 1.18 2.60 52.34 56.89 2.27 0.62 312.37 26 0.95 2.13 50.12 54.47 2.17 0.60 312.35 27 0.71 1.66 47.66 51.78 2.06 0.59 312.34 28 0.47 1.18 44.96 48.84 1.94 0.57 312.32 29 0.24 0.71 42.06 45.67 1.81 0.55 312.30 30 0.00 0.24 38.96 42.29 1.67 0.53 312.28 31 0.00 0.00 35.90 38.96 1.53 0.51 312.26 32 0.00 0.00 33.09 35.90 1.41 0.49 312.24 33 0.00 0.00 30.47 33.09 1.31 0.48 312.23 34 0.00 0.00 28.02 30.47 1.22 0.46 312.21 35 0.00 0.00 25.74 28.02 1.14 0.44 312.19 36 0.00 0.00 23.62 25.74 1.06 0.43 312.18 37 0.00 0.00 21.64 23.62 0.99 0.41 312.16 38 0.00 0.00 19.79 21.64 0.92 0.40 312.15 39 0.00 0.00 18.07 19.79 0.86 0.38 312.13 40 0.00 0.00 16.48 18.07 0.80 0.36 312.11 41 0.00 0.00 15.00 16.48 0.74 0.35 312.10 42 0.00 0.00 13.62 15.00 0.69 0.33 312.08 43 0.00 0.00 12.34 13.62 0.64 0.32 312.07 44 0.00 0.00 11.16 12.34 0.59 0.31 312.06 Garrett Engineering· 4444 Carter Creek Parkway Suite 108. Bryan. Texas 77802. Telephone: (979) 846·2688 • Fax: (979) 846-3094 Page 26 45 0.00 0.00 10.05 11.16 0.55 0.30 312.05 46 0.00 0.00 9.03 10.05 0.51 0.28 312.03 47 0.00 0.00 8.07 9.03 0.48 0.27 312.02 48 0.00 0.00 7.19 8.07 0.44 0.26 312.01 49 0.00 0.00 6.36 7.19 0.41 0.26 312.01 50 0.00 0.00 5.60 6.36 0.38 0.25 312.00 51 0.00 0.00 4.90 5.60 0.35 0.23 311.98 52 0.00 0.00 4.27 4.90 0.32 0.22 311.97 53 0.00 0.00 3.68 4.27 0.29 0.21 311.96 54 0.00 0.00 3.15 3.68 0.27 0.20 311.95 55 0.00 0.00 2.66 3.15 0.24 0.19 311.94 56 0.00 0.00 2.21 2.66 0.22 0.18 311.93 57 0.00 0.00 1.81 2.21 0.20 0.17 311.92 58 0.00 0.00 1.43 1.81 0.19 0.16 311.91 59 0.00 0.00 1.09 1.43 0.17 0.16 311.91 60 0.00 0.00 0.79 1.09 0.15 0.14 311.89 Garrett Engineering· 4444 Carter Creek Parkway Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 Page 27 -~ c 0 C,J Cl) V) ... Cl) 0. - I ' \ ' I \ I Inflow/Outflow Simulation 10-Year Storm Event \ \ \ \ \ Cl) ~ 3 .00 .._ ___ , __ _j_ _____ ,_-1---------1-------+--------+-------+---------4 C,J ..c :::I u -~ 0 = -:::I 0 0 10 20 30 ------------------- 40 50 60 70 Inflow I Outflow Simulation 25-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.75 0.54 0.54 0.39 0.54 0.07 0.07 311.82 2 1.08 1.62 1.62 2.01 0.20 0.17 311.92 3 1.62 2.70 3.73 4.32 0.29 0.21 311.96 4 2.16 3.78 6.67 7.52 0.42 0.26 312.01 5 2.70 4.86 10.40 11.53 0.57 0.30 312.05 6 3.24 5.94 14.87 16.34 0.74 0.35 312.10 7 3.78 7.02 20.03 21.90 0.93 0.40 312.15 8 4.32 8.10 25.85 28.14 1.14 0.44 312.19 9 4.86 9.18 32.28 35.03 1.38 0.49 312.24 10 5.40 10.26 39.19 42.54 1.68 0.53 312.28 11 5.13 10.54 45.77 49.72 1.98 0.57 312.32 12 4.86 9.99 51.31 55.77 2.23 0.61 312.36 13 4.59 9.45 55.89 60.77 2.44 0.64 312.39 14 4.32 8.91 59.60 64.81 2.60 0.66 312.41 15 4.05 8.37 62.50 67.97 2.74 0.68 312.43 16 3.78 7.83 64.67 70.34 2.83 0.69 312.44 17 3.51 7.29 66.16 71.96 2.90 0.70 312.45 18 3.24 6.75 67.03 72.91 2.94 0.71 312.46 19 2.97 6.21 67.33 73.24 2.96 0.71 312.46 20 2.70 5.67 67.11 73.00 2.95 0.71 312.46 21 2.43 5.13 66.42 72.24 2.91 0.70 312.45 22 2.16 4.59 65.28 71.01 2.86 0.70 312.45 23 1.89 4.05 63.75 69.34 2.79 0.69 312.44 24 1.62 3.51 61.85 67.26 2.71 0.68 312.43 25 1.35 2.97 59.61 64.82 2.60 0.66 312.41 26 1.08 2.43 57.06 62.04 2.49 0.65 312.40 27 0.81 1.89 54.23 58.96 2.36 0.63 312.38 28 0.54 1.35 51.14 55.59 2.22 0.61 312.36 29 0.27 0.81 47.82 51.96 2.07 0.59 312.34 30 0.00 0.27 44.27 48.09 1.91 0.57 312.32 31 0.00 0.00 40.77 44.27 1.75 0.54 312.29 32 0.00 0.00 37.57 40.77 1.60 0.52 312.27 33 0.00 0.00 34.63 37.57 1.47 0.51 312.26 34 0.00 0.00 31.90 34.63 1.36 0.49 312.24 35 0.00 0.00 29.36 31.90 1.27 0.47 312.22 36 0.00 0.00 26.99 29.36 1.18 0.45 312.20 37 0.00 0.00 24.78 26.99 1.10 0.43 312.18 38 0.00 0.00 22.72 24.78 1.03 0.42 312.17 39 0.00 0.00 20.80 22.72 0.96 0.41 312.16 40 0.00 0.00 19.01 20.80 0.89 0.39 312.14 41 0.00 0.00 17.35 19.01 0.83 0.37 312.12 42 0.00 0.00 15.81 17.35 0.77 0.36 312.11 43 0.00 0.00 14.37 15.81 0.72 0.34 312.09 44 0.00 0.00 13.04 14.37 0.67 0.33 312.08 45 0.00 0.00 11.80 13.04 0.62 0.31 312.06 Garrett Engineering · 4444 Carter Creek Par1May Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 29 46 0.00 0.00 10.65 11.80 0.58 0.30 312.05 47 0.00 0.00 9.59 10.65 0.53 0.29 312.04 48 0.00 0.00 8.59 9.59 0.50 0.28 312.03 49 0.00 0.00 7.67 8.59 0.46 0.27 312.02 50 0.00 0.00 6.81 7.67 0.43 0.26 312.01 51 0.00 0.00 6.02 6.81 0.40 0.25 312.00 52 0.00 0.00 5.28 6.02 0.37 0.24 311.99 53 0.00 0.00 4.61 5.28 0.34 0.23 311.98 54 0.00 0.00 4.00 4.61 0.31 0.21 311.96 55 0.00 0.00 3.44 4.00 0.28 0.20 311.95 56 0.00 0.00 2.93 3.44 0.26 0.19 311.94 57 0.00 0.00 2.46 2.93 0.23 0.18 311.93 58 0.00 0.00 2.03 2.46 0.21 0.17 311.92 59 0.00 0.00 1.64 2.03 0.20 0.17 311.92 60 0.00 0.00 1.28 1.64 0.18 0.16 311.91 Garrett Engineering · 4444 Carter Creek Parkway Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 30 -'t:I Inflow/Outflow Simulation 25-Year Storm Event ' I \ \ ' ' I \ ' \ ' c 0 u Q) ~ 4.00 ,._~~~~~-+-~~~-'~~+-~~~~~--t-~~~~~--+~~~~~--j~~~~~~+-~~~~---1 Q) fl. -Q) Q) .... u ..c ::::s (J \ ' \ ' ; 3.00..-~~~~-t-t--T-~~--::=:1-~~~~~-i-~~~~~;--~~~~-;~~~~~--r-~~~~------j 0 ;;::: -::::s 0 0 10 ---Pre -Development Hydrograph ---Post -Devel opm ent Outflow With Detention 20 30 40 50 60 Ti"110 /Min11t6c\ - - -Post -Development Outflow Hydrograph Without Detent ion --- - -·Post-Development 'Free · Flow ' Garrett Engineering · 4444 Carter Creek Parkway Suite 108 · Bryan , Texas 77802 · Telephone: (979) 846-2688 -Fax: (979) 846-3094 . Page 31 7( Inflow I Outflow Simulation 50-Year Storm Event T ime Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0 .00 0.00 311 .75 1 0.61 0.61 0 .44 0.61 0.08 0.08 311 .83 2 1.22 1.83 1.86 2 .28 0.21 0.17 311 .92 3 1.83 3.05 4 .28 4 .92 0.32 0 .22 311 .97 4 2 .44 4 .28 7 .63 8.55 0.46 0 .27 312 .02 5 3.05 5.50 11 .88 13 .13 0 .62 0.31 312 .06 6 3.66 6 .72 16 .97 18 .60 0.82 0 .37 312 .12 7 4 .28 7 .94 22 .84 24 .91 1.03 0 .42 312 .17 8 4 .89 9 .16 29.45 32.00 1.27 0.47 312 .22 9 5.50 10.38 36 .71 39.84 1.56 0 .52 312 .27 10 6.1 1 11 .60 44.48 48 .31 1.92 0 .57 312 .32 11 5.80 11 .91 51 .88 56.38 2 .25 0 .61 312 .36 12 5.50 11.30 58 .10 63 .18 2.54 0 .65 312 .40 13 5.19 10.69 63 .25 68 .79 2 .77 0 .68 312 .43 14 4 .89 10 .08 67.41 73 .33 2 .96 0 .7 1 312 .46 15 4 .58 9.47 70 .66 76 .88 3.11 0 .73 312.48 16 4 .28 8 .86 73 .09 7 9 .52 3.22 0 .75 312 .50 17 3.97 8.24 #VALUE ! 81 .33 Overflow ! overflow #VALUE ! 18 3.66 7 .63 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE! 19 3 .36 7 .02 #VALUE ! #VALUE! #VALUE! #VALUE ! #VALUE ! 20 3 .05 6.41 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 21 2 .75 5.80 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 22 2 .44 5 .19 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE! 23 2 .14 4 .58 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 24 1.83 3.97 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 25 1.53 3.36 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 26 1.22 2 .75 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 27 0.92 2 .14 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 28 0 .61 1.53 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 29 0.31 0.92 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 30 0 .00 0 .31 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 31 0 .00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 32 0.00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 33 0 .00 0 .00 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 34 0.00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 35 0.00 0 .00 #VALUE ! #VALUE! #VALUE ! #VALUE! #VALUE ! 36 0.00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 37 0 .00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 38 0 .00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE! #VALUE ! 39 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 40 0 .00 0 .00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 41 0.00 0.00 #VALUE! #VALUE ! #VALUE ! #VALUE! #VALUE ! 42 0 .00 0 .00 #VALUE! #VALUE ! #VALUE! #VALUE ! #VALUE ! 43 0 .00 0 .00 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 44 0.00 0.00 #VALUE! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 45 0.00 0.00 #VALUE! #VALUE! #VALUE ! #VALUE! #VALUE ! Garrett Enginee ri ng -444-4 carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 -Page 32 46 0 .00 0 .00 #VALUE! #VALUE! #VALUE! #VALUE! #VALUE! 47 0 .00 0.00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE! 48 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE! #VALUE ! 49 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE! #VALUE! 50 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE! #VALUE ! 51 0.00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE! #VALUE ! 52 0 .00 0 .00 #VALUE! #VALUE! #VALUE! #VALUE! #VALUE! 53 0.00 0 .00 #VALUE! #VALUE ! #VALUE! #VALUE! #VALUE! 54 0 .00 0 .00 #VALUE! #VALUE! #VALUE! #VALUE! #VALUE ! 55 0.00 0 .00 #VALUE! #VALUE! #VALUE! #VALUE ! #VALUE! 56 0 .00 0.00 #VALUE! #VALUE! #VALUE! #VALUE ! #VALUE! 57 0.00 0.00 #VALUE! #VALUE! #VALUE! #VALUE ! #VALUE ! 58 0 .00 0.00 #VALUE! #VALUE! #VALUE! #VALUE! #VALUE! 59 0 .00 0 .00 #VALUE! #VALUE! #VALUE! #VALUE! #VALUE! 60 0 .00 0 .00 #VALUE! #VALUE! #VALUE! #VALUE ! #VALUE ! Garrett Ersineering · 4444 Carter Creek Parkway Suite 108 . Bryan, Texas 77802 . Telephone : (979) 846-2688 . Fax: (979) 846-3094 . Page 33 6.00 5 .00 -.,, c 0 I.> Cl) IJ) 4.00 ... Cl) 0... -Cl) Cl) ..... I.> ..Q ::::s (.) 3 .00 -~ 0 ::: -::::s 0 2 .00 Inflow/Outflow Simulation 50-Year Storm Event I I I \ ' I I \ I \ I ' I \ I \ 0 10 20 ---Pre -Development Hydrograph ---Post -Deve lopment Outflow With Detention 3 0 4 0 50 60 70 Time (Minutes) • • • Post -Development Outflow Hydrograph Without Detent ion • • • • • ·Post -Development 'Free -Flow ' Gamrtt Engi nee ring . 4444 Ca rter Creek Parkway Suite 108 . Bryan, Texas 77602 . Telephone : (979) 846-2688 . Fax: (979) 846-3094 . Page 34 Inflow I Outflow Simulation 100-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311 .75 1 0.64 0.64 0 .46 0 .64 0.09 0 .08 311 .83 2 1.28 1.91 1.95 2 .38 0.21 0.17 311 .92 3 1.91 3.19 4 .48 5.14 0.33 0.22 31 1.97 4 2.55 4 .46 8.00 8.95 0.47 0.27 312 .02 5 3.19 5.74 12.45 13.74 0.64 0.32 312 .07 6 3.83 7 .01 17.77 19.47 0.85 0.38 312 .13 7 4.46 8.29 23 .92 26 .06 1.07 0.43 312 .18 8 5.10 9.56 30 .83 33.48 1.32 0.48 312 .23 9 5.74 10.84 38 .39 41 .67 1.64 0.53 312 .28 10 6 .38 12.12 46.49 50 .50 2.01 0.58 312 .33 11 6.06 12.43 54 .20 58 .92 2 .36 0.63 312 .38 12 5.74 11 .80 60 .69 66 .00 2.65 0.67 312.42 13 5.42 11 .16 66 .06 71 .85 2.90 0.70 312 .45 14 5.10 10.52 70 .39 76 .58 3.09 0.73 312.48 15 4 .78 9.88 #VALUE ! 80 .27 Overflow! overflow #VALUE ! 16 4.46 9.25 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 17 4 .14 8.61 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 18 3.83 7 .97 #VALUE ! #VALUE ! #VALUE! #VALUE ! #VALUE ! 19 3 .51 7.33 #VALUE! #VALUE ! #VALUE ! #VALUE! #VALUE ! 20 3.19 6.70 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 21 2 .87 6.06 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 22 2 .55 5.42 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 23 2.23 4 .78 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 24 1.91 4 .14 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 25 1.59 3.51 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 26 1.28 2.87 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 27 0.96 2 .23 #VALUE ! #VALUE ! #VALUE! #VALUE ! #VALUE ! 28 0 .64 1.59 #VALUE ! #VALUE! #VALUE ! #VALUE! #VALUE ! 29 0.32 0.96 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 30 0.00 0.32 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 31 0.00 0.00 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 32 0.00 0.00 #VALUE! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 33 0.00 0.00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 34 0.00 0.00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 35 0.00 0.00 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 36 0.00 0.00 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 37 0.00 0.00 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 38 0.00 0.00 #VALUE ! #VALUE! #VALUE! #VALUE ! #VALUE ! 39 0.00 0.00 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 40 0 .00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 41 0.00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 42 0.00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 43 0.00 0.00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 44 0.00 0.00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 45 0.00 0.00 #VALUE ! #VALUE ! #VALUE ! #VALUE ! #VALUE ! Garrett Engineering · 4444 carter Creek Par1<way Surte 108 · Bryan, Texa s 77802 . Telephone: (979) 846-2688 · Fax: (979) 846-3094 . Page 35 46 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 47 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 48 0.00 0.00 #VALUE! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 49 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 50 0 .00 0 .00 #VALUE! #VALUE! #VALUE! #VALUE ! #VALUE! 51 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE! 52 0.00 0.00 #VALUE! #VALUE! #VALUE! #VALUE! #VALUE! 53 0 .00 0 .00 #VALUE! #VALUE! #VALUE! #VALUE ! #VALUE! 54 0 .00 0.00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE! 55 0 .00 0 .00 #VALUE ! #VALUE! #VALUE ! #VALUE ! #VALUE ! 56 0.00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 57 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! 58 0 .00 0 .00 #VALUE! #VALUE ! #VALUE ! #VALUE ! #VALUE ! 59 0 .00 0 .00 #VALUE! #VALUE! #VALUE! #VALUE ! #VALUE ! 60 0 .00 0 .00 #VALUE! #VALUE! #VALUE ! #VALUE ! #VALUE ! Garrett Enginee rt ng . 4444 carter Creek Parkway Surte 108 · Biyan, Texa s 77802 · Telephone : (979) 846-2688 · Fax: (979) 846-3094 · Page 36 8 .00 7 .00 6.00 -"O 5.00 c 0 u Q) en ... Q) ll.. -Q) Q) 4 .00 ~ u .c ::I u -~ 0 :;: -3 .00 ::I 0 2.00 1.00 0 .0 0 Inflow/Outflow Simulation 100-Year Storm Event l ,, I \ I ' I \ . • I \ I ' I \ I ' I \ ~ I \ I ' I \ I ' I \ I ' I I I\ \ I ' I J I ' I \ I I ' I \ I ' I \ I ' I \ I J I\\. I I I I . V --' ' ' ____ \ ' , ' '' , ' , , , '' 0 10 20 30 40 50 60 70 Time (Minutes) ---Pre-Development Hydrograph ---Post -Deve lopment Outf low Wit h Detent ion • • • Pos t -Development Outflow Hydrograph Without Detent ion - - - --·Post -Development 'F ree -Flow' Garrett Engineeri ng · 4444 Garter Creek ParXway Suite 108 · Bryan , Texas 77802 -Telephone : (979) 846-2688 -Fa x: (979) 846-3094 -Page 37 -"'O c 0 u Q) (/) ... Q) a. -Q) Q) .... u .c ::I (.) - Inflow/Outflow Simulation 2-Year Storm Event 1.50 ~ ..2 1 .0 0 •-~~---1-~-----+~~~~~---l-\--~~~~~+---'~~~~-+--~~~~~-1-~~~~~--+~~~~~--1 --::I 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Deve lopment Hydrograph -Tota l Post .Development Hydrograph Garrett E~neenng -4444 Corter Creek Par1<way Suite 108 -Bryan, Texas 7781J2 -Telephone: (979) 846-2688 -Fax : (979) 846-3094 -Page 38 Inflow/Outflow Simulation 5-Year Storm Event 2.0 0 -'l:J c: 0 u Cl) (/) ... Cl) 0.. -Cl) Cl) 1.50 ..... u .c ::I (.) -;t 0 = -::I 0 1.0 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Deve lopment Hydrograph -Tota l Post-Development Hydrograph Garrett Engineering -4444 Carter Creek Parkway Suite 108 . Bryan, Texas 77602 . Telephone : (979) 846-2688 . Fax: (979) 846-3094 . Page 3l!J -"Cl c 0 u Q) Inflow/Outflow Simulation 10-Year Storm Event ~ 2.00--~~-+-~-----~~---~-t-~~~----t-~~~~-t-~~~~-t-~~~~-t-~~~---< ... Q) a. -Q) Q) .... -~ ..c :::s u -; 1.50 0 ;: -:::s 0 0 10 20 3 0 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post -Development Hydrograph Garrett Engineering · 4444 Corter Creek Parkway Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Pase 40 Inflow/Outflow Si mulation 25-Year Storm Event 2.50 -"1:1 c 0 I.I Q) V) 2 .00 ... Q) Q. -Q) Q) LI. I.I .Q :::s (..) 1.50 -~ 0 :;: -:::s 0 1.00 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Tota l Post-Development Hydrograph Garrett Engineering · 4444 Carter Creek Parkway Suite 108 ·Bryan, Texas 77802 -Telephone: (979) 646-2688 . Fax: (979) 846-3094 . Page 41 4.00 3 .50 3 .00 --g 2 .50 0 (,) Cl) (/) ... Cl) ll.. -Cl) ~ 2 .00 (,) .J:2 :s (J -;i:: 0 :;:: -1.50 :s 0 1.00 0.50 0 .00 0 Inflow/Outflow Simulation SO-Year Storm Event j \ J I \ I\ ' I\ I I I v \ 10 20 30 40 50 60 70 Time (Minutes) -Pre -Deve lopment Hydrograph -Total Post-Development Hydrograph Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 . Tetephone : (979) 846-2688 -Fax: (979) 846-3094 -Page 4 2 Inflow/Outflow Simulation 100-Year Storm Event 4.50 4 .0 0 3 .00 -"'C c 0 u Q) I/) ... 2 .50 Q) ll.. -Q) Q) ..... u .Jl ::I 2.00 (,) J\ \~ j I I \ j I \ 3 .50 -3:: 0 :;:: -::I 0 1.50 \ I \ J J I \ v \ 1.00 0 .50 0.0 0 0 10 2 0 3 0 40 50 60 70 Time (Minutes) -Pre -Development Hy drograph -Total Pos t -Dev elopment Hydrog raph Garrett Engineering · 4444 carter Creek Parkway Suit e 108 · Bryan, Texas 77802 . Telephone: (979) 846-2668 . Fax: (979) 846-3094 . Page 43 Detention Pond Storage Volumes as Percent of Maximum Volume 70% -1--------1 Cl) E :::s 0 60% -1--------1 > E :::s E ·;c 50 % "1 ::E -0 -; 40 % I.) ... Cl) 0. 30 % 20 3 10% 2 -year Storm Depth Storm Elevat ion Storm Vo lume Maximum Capacity Percen t of Capac ity 2 -ear 0 .56 312.31 1353 2308 59 % 5 -year 10 -year 25 -year 50 -year Des ign Storm Storm Simulation Sy nop si s 5-ear 10-ear 25 -ear 50 -ear 100-ear 0 .62 0 .6 6 0 .71 #VAL UE! #VALUE! 312 .37 312.41 312 .46 #V ALUE! #VALUE! 1647 1848 2 109 #V AL UE! #VALUE! 2308 23 08 2308 2308 2308 71 % 80% 91% #VALUE! #VALUE! Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan , Texas 77802 . Telephone : {979) 846-2688 . Fax: (979) 846-3094 . Page 44 100-year Determine Total Pre-Development Peak Storm Water Discharge Rates Tributary Area {ip 0.712 Acres Pervious Area : Impervious Area : Run -Off Coefficient ("Cwt "): Time Of Concentration ("T /c"): Woodlands: Pastures: Pavements: 0.52 0 .636 0 .076 10.00 Low Elevation: High Elevation: Distance (Feet): Slope(% Grade): Velocity ("Vw"): Time : Low Elevation : High Elevation : Distance (Feet): Slope(% Grade): Veloc ity ("Vp"): Time : Low Elevation: High Elevation: Distance (Feet): Slope(% Grade): Velocity ("Vpave "): Time: TotalTravel Time : Acres Acres Use Min. Travel Time: Hourly Intensity Rates ("I"): 2 -Year: 6.33 5 -Year : 7 .69 10-Year: 8.63 25-Year: 9 .86 50 -Year: 11.15 100-Year: 11.64 Peak Discharge Rate ("Q"): 2 -Year: 2.36 5 -Year: 2.87 10-Year: 3 .22 25 -Year : 3 .68 50 -Year: 4 .15 100-Year: 4 .34 c = 0 .47 c = 0 .97 313.00 319.00 250 .00 2.40 1.20 Feet I Second 3 .47 Minutes 0.00 0 .00 0 .00 0 .00 0.00 Feet I Second 0 .00 Minutes 0 .00 0.00 0.00 0 .00 0 .00 Feet I Second 0.00 Minutes 3.47 10.00 Minutes Inches I Hour Inches I Hour Inches I Hou r Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Fee t I Second Cubic Feet I Second Garrett Engineering -4444 Garter Creek Par1<way Suite 108 ·Brya n, Texas 77802 . Telephone : (979) 846-2688 . Fax: (979) 846-3094 . Page 1 Determine Post-development Peak Storm Water Discharge (No Detention) Tri butary Area ("A"): 0 .712 Pervious Area: Imperv ious Area : Run-Off Coefficie nt ("Cwt "): Acres 0 .88 0 .128 0 .584 Acres Acres c = 0 .46 c = 0 .97 Ti me Of Concentration ("T /c"): 10.00 Minutes Hourly Intensi t y Rates ("I"): 2 -Year : 5-Year : 10-Year : 25 -Year: 50 -Year: 100-Year : Peak Discharge Rate ("Q"): 2-Year : 5 -Year : 10-Year : 25 -Year : 50 -Year: 100-Year : Comparison Of Predevelopment And Post-development Peak Discharge Rates 2 -Year : 5 -Year: 10-Year : 25 -Year: 50 -Yea r: 100-Year : Predevelopment 2 .36 Ft3/sec 2.87 Ft3/sec 3.22 Ft3/sec 3 .68 Ft3/sec 4 .15 Ft3/sec 4 .34 Ft3 /sec Preliminary Determination Of Detention Pond Volume 2 -Year : 1.60 Ft3 /sec x (30 Min . 5-Year : 1.94 Ft3/sec x (30 Min . 10 -Year : 2 .18 Ft3/sec x (30 Min. 25 -Year : 2.49 Ft3/sec x (30 Min. 50-Year : 2.82 Ft3/sec x (30 Min . 100-Year : 2.94 Ft3 /sec x (3 0 Min . x 60 x 60 x 6 0 x 60 x 60 x 60 6 .33 Inc hes I Hour 7.69 Inches I Hour 8 .63 Inc hes I Hour 9 .86 Inches I Hour 11.15 Inches I Hour 11.64 Inc hes I Hour 3 .96 Cubic Feet I Second 4.81 Cubic Feet I Second 5.40 Cubic Feet I Second 6 .17 Cubic Feet I Second 6 .97 Cubic Feet I Second 7 .28 Cubic Feet I Second Post -Development Increase Sec . Sec. Sec . Sec . Sec . Sec . 3.96 Ft 3/sec 4 .81 Ft3/sec 5.40 Ft3/sec 6.17 Ft3/sec 6 .97 Ft3/sec 7.28 Ft3/sec I 2 )= I 2 )= I 2 )= I 2 )= I 2 )= I 2 )= 1.60 Ft3/sec 1.94 Ft3/sec 2.18 Ft3/sec 2 .49 Ft3/sec 2 .82 Ft3/sec 2.94 Ft3/sec 1,438 Cubic 1,749 Cub ic 1,963 Cubic 2 ,242 Cubic 2 ,535 Cubi c 2 ,646 Cub ic Time Base (Tb)= 3 .00 x T /c And Time Of Concentration (T /c) Of 10 Minutes . Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77002 • Telephone : (979) 846-2688 . Fax: (979) 846-3094 . Page 2 Feet Feet Feet Feet Feet Feet Determine Post-Development "Free-Flow" Peak Storm Water Discharge Tri butary Area ("A"): 0.159 Pervious Area : Impervious Area : Run -Off Coeff icient ("Cwt"): Acres 0.93 0.012 0.147 Acres Acres T i me Of Concentration ("T le"): 10.00 Minutes (Min .) Hourly Intensity Rates ("I"): 2 -Year: 6.33 5 -Year: 7 .69 10-Year: 8 .63 25 -Year: 9 .86 50 -Year: 11.15 100-Year: 11.64 Peak Discharge Rate ("Q"): 2 -Year : 0 .94 5-Year : 1.14 10-Year: 1.28 25 -Year : 1.47 50-Year : 1.66 100-Year: 1.73 c = 0 .47 c = 0 .97 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cub ic Feet I Second Cub ic Feet I Second Cubic Feet I Second Garrett Engineering -4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone : (979) 846-2688 . Fax: (979) 846-3094 . Page 3 Determine Post-Development Flow Into Detention Pond Tributary Area ("A"): 0.553 Pervious Area: Impervious Area: Acres 0 .116 0.436 Acres Acres Run -Off Coefficient ("Cwt "): 0 .86 Time Of Concentration ("T /c"): 10.00 Minutes Hourly Intensity Rates ("I"): 2 -Year : 6.33 5-Year : 7 .69 10-Year: 8.63 25-Year : 9.86 50-Year : 11.15 100-Year: 11.64 Peak Discharge Rate ("Q"): 2 -Year: 3.02 5 -Year: 3.68 10-Year: 4 .13 25 -Year: 4 .71 50-Year: 5.33 100-Year: 5 .56 c = 0.47 c = 0 .97 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Cubic Feet I Second Ga rrett Engineeri ng · 4444 carter Creek Parkway Suite 108 · Bryan , Texas 77802 . Telephone : (979) 846-2688 -Fax : (979) 846-3094 . Page 4 Pre-Development Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 o_oo 0.00 0.00 1 0.24 0.29 0.32 0.37 0.42 0.43 2 0.47 0.57 0.64 0.74 0.83 0.87 3 0.71 0.86 0.97 1.10 1.25 1.30 4 0.94 1.15 1.29 1.47 1.66 1.73 5 1.18 1.43 1.61 1.84 2.08 2.17 6 1.41 1.72 1.93 2.21 2.49 2.60 7 1.65 2.01 2.25 2.57 2.91 3.04 8 1.89 2.29 2.57 2.94 3.32 3.47 9 2.12 2.58 2.90 3.31 3.74 3.90 11 2.24 2.72 3.06 3.49 3.95 4.12 12 2.12 2.58 2.90 3.31 3.74 3.90 13 2.00 2.44 2.74 3.12 3.53 3.69 14 1.89 2.29 2.57 2.94 3.32 3.47 15 1.77 2.15 2.41 2.76 3.12 3.25 16 1.65 2.01 2.25 2.57 2.91 3.04 17 1.53 1.86 2.09 2.39 2.70 2.82 18 1.41 1.72 1.93 2.21 2.49 2.60 19 1.30 1.58 1.77 2.02 2.28 2.39 20 1.18 1.43 1.61 1.84 2.08 2.17 21 1.06 1.29 1.45 1.65 1.87 1.95 22 0.94 1.15 1.29 1.47 1.66 1.73 23 0.83 1.00 1.13 1.29 1.45 1.52 24 0.71 0.86 0.97 1.10 1.25 1.30 25 0.59 0.72 0.80 0.92 1.04 1.08 26 0.47 0.57 0.64 0.74 0.83 0.87 27 0.35 0.43 0.48 0.55 0.62 0.65 28 0.24 0.29 0.32 0.37 0.42 0.43 29 0.12 0.14 0.16 0.18 0.21 0.22 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 o_oo 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 o_oo 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering -4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 Page 5 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett E'l!ineering · 4444 carter Creek Parkway Suite 108 . Bryan, Texas 77802 · Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Page 6 Post-Development Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.40 0.48 0.54 0.62 0.70 0.73 2 0.79 0.96 1.08 1.23 1.39 1.46 3 1.19 1.44 1.62 1.85 2.09 2.18 4 1.58 1.92 2.16 2.47 2.79 2.91 5 1.98 2.41 2.70 3.08 3.49 3.64 6 2.37 2.89 3.24 3.70 4.18 4.37 7 2.77 3.37 3.78 4.32 4.88 5.09 8 3.16 3.85 4.32 4.93 5.58 5.82 9 3.56 4.33 4.86 5.55 6.27 6.55 11 3.76 4.57 5.13 5.86 6.62 6.91 12 3.56 4.33 4.86 5.55 6.27 6.55 13 3.36 4.09 4.59 5.24 5.92 6.19 14 3.16 3.85 4.32 4.93 5.58 5.82 15 2.97 3.61 4.05 4.62 5.23 5.46 16 2.77 3.37 3.78 4.32 4.88 5.09 17 2.57 3.13 3.51 4.01 4.53 4.73 18 2.37 2.89 3.24 3.70 4.18 4.37 19 2.18 2.65 2.97 3.39 3.83 4.00 20 1.98 2.41 2.70 3.08 3.49 3.64 21 1.78 2.16 2.43 2.77 3.14 3.28 22 1.58 1.92 2.16 2.47 2.79 2.91 23 1.38 1.68 1.89 2.16 2.44 2.55 24 1.19 1.44 1.62 1.85 2.09 2.18 25 0.99 1.20 1.35 1.54 1.74 1.82 26 0.79 0.96 1.08 1.23 1.39 1.46 27 0.59 0.72 0.81 0.92 1.05 1.09 28 0.40 0.48 0.54 0.62 0.70 0.73 29 0.20 0.24 0.27 0.31 0.35 0.36 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering· 4444 Carter Creek Parkway Suite 108 · Bryan, Texas 77802 ·Telephone: (979) 846·2688 -Fax: (979) 846-3094 · Page 7 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 . Fax: (979) 846-3094 Page 8 Post-Development "Free-Flow" Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.09 0.11 0.13 0.15 0.17 0.17 2 0.19 0.23 0.26 0.29 0.33 0.35 3 0.28 0.34 0.39 0.44 0.50 0.52 4 0.38 0.46 0.51 0.59 0.66 0.69 5 0.47 0.57 0.64 0.73 0.83 0.87 6 0.56 0.69 0.77 0.88 0.99 1.04 7 0.66 0.80 0.90 1.03 1.16 1.21 8 0.75 0.91 1.03 1.17 1.33 1.38 9 0.85 1.03 1.16 1.32 1.49 1.56 11 0.89 1.09 1.22 1.39 1.57 1.64 12 0.85 1.03 1.16 1.32 1.49 1.56 13 0.80 0.97 1.09 1.25 1.41 1.47 14 0.75 0.91 1.03 1.17 1.33 1.38 15 0.71 0.86 0.96 1.10 1.24 1.30 16 0.66 0.80 0.90 1.03 1.16 1.21 17 0.61 0.74 0.83 0.95 1.08 1.12 18 0.56 0.69 0.77 0.88 0.99 1.04 19 0.52 0.63 0.71 0.81 0.91 0.95 20 0.47 0.57 0.64 0.73 0.83 0.87 21 0.42 0.51 0.58 0.66 0.75 0.78 22 0.38 0.46 0.51 0.59 0.66 0.69 23 0.33 0.40 0.45 0.51 0.58 0.61 24 0.28 0.34 0.39 0.44 0.50 0.52 25 0.24 0.29 0.32 0.37 0.41 0.43 26 0.19 0.23 0.26 0.29 0.33 0.35 27 0.14 0.17 0.19 0.22 0.25 0.26 28 0.09 0.11 0.13 0.15 0.17 0.17 29 0.05 0.06 0.06 0.07 0.08 0.09 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering · 4444 Carter Creek Par1<way Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 9 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering· 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 ·Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Page 10 Post-Development Flow Routed Through Detention Pond Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.30 0.37 0.41 0.47 0.53 0.56 2 0.60 0.74 0.83 0.94 1.07 1.11 3 0.91 1.10 1.24 1.41 1.60 1.67 4 1.21 1.47 1.65 1.89 2.13 2.23 5 1.51 1.84 2.06 2.36 2.66 2.78 6 1.81 2.21 2.48 2.83 3.20 3.34 7 2.12 2.57 2.89 3.30 3.73 3.89 8 2.42 2.94 3.30 3.77 4.26 4.45 9 2.72 3.31 3.71 4.24 4.79 5.01 11 2.87 3.49 3.92 4.48 5.06 5.28 12 2.72 3.31 3.71 4.24 4.79 5.01 13 2.57 3.13 3.51 4.01 4.53 4.73 14 2.42 2.94 3.30 3.77 4.26 4.45 15 2.27 2.76 3.09 3.53 4.00 4.17 16 2.12 2.57 2.89 3.30 3.73 3.89 17 1.97 2.39 2.68 3.06 3.46 3.62 18 1.81 2.21 2.48 2.83 3.20 3.34 19 1.66 2.02 2.27 2.59 2.93 3.06 20 1.51 1.84 2.06 2.36 2.66 2.78 21 1.36 1.65 1.86 2.12 2.40 2.50 22 1.21 1.47 1.65 1.89 2.13 2.23 23 1.06 1.29 1.44 1.65 1.86 1.95 24 0.91 1.10 1.24 1.41 1.60 1.67 25 0.76 0.92 1.03 1.18 1.33 1.39 26 0.60 0.74 0.83 0.94 1.07 1.11 27 0.45 0.55 0.62 0.71 0.80 0.83 28 0.30 0.37 0.41 0.47 0.53 0.56 29 0.15 0.18 0.21 0.24 0.27 0.28 30 0.00 0.00 0.00 0.00 0.00 0.00 31 0.00 0.00 0.00 0.00 0.00 0.00 32 0.00 0.00 0.00 0.00 0.00 0.00 33 0.00 0.00 0.00 0.00 0.00 0.00 34 0.00 0.00 0.00 0.00 0.00 0.00 35 0.00 0.00 0.00 0.00 0.00 0.00 36 0.00 0.00 0.00 0.00 0.00 0.00 37 0.00 0.00 0.00 0.00 0.00 0.00 38 0.00 0.00 0.00 0.00 0.00 0.00 39 0.00 0.00 0.00 0.00 0.00 0.00 40 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering -4444 Garter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 Page 11 41 0.00 0.00 0.00 0.00 0.00 0.00 42 0.00 0.00 0.00 0.00 0.00 0.00 43 0.00 0.00 0.00 0.00 0.00 0.00 44 0.00 0.00 0.00 0.00 0.00 0.00 45 0.00 0.00 0.00 0.00 0.00 0.00 46 0.00 0.00 0.00 0.00 0.00 0.00 47 0.00 0.00 0.00 0.00 0.00 0.00 48 0.00 0.00 0.00 0.00 0.00 0.00 49 0.00 0.00 0.00 0.00 0.00 0.00 50 0.00 0.00 0.00 0.00 0.00 0.00 51 0.00 0.00 0.00 0.00 0.00 0.00 52 0.00 0.00 0.00 0.00 0.00 0.00 53 0.00 0.00 0.00 0.00 0.00 0.00 54 0.00 0.00 0.00 0.00 0.00 0.00 55 0.00 0.00 0.00 0.00 0.00 0.00 56 0.00 0.00 0.00 0.00 0.00 0.00 57 0.00 0.00 0.00 0.00 0.00 0.00 58 0.00 0.00 0.00 0.00 0.00 0.00 59 0.00 0.00 0.00 0.00 0.00 0.00 60 0.00 0.00 0.00 0.00 0.00 0.00 Garrett Engineering -4444 Carter Creek Parkway Suite 108 · Bryan, Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 . Page 12 -"C c 0 (,,) Cll (/) .... Cll ll.. -Cll Cll ....... (,,) ..c :l Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 2-Year Storm Event 4 .50 4 .00 3.50 3.00 2.50 2 .00 ) \. I \. ' I \. I I ~ '\ ~ 1.50 I I ~ I\ I I ""' r-._ \. Cll QO :; 1.00 II ~\. ..c (,,) "' c 0 .50 f 0 .00 0 ~ 10 20 30 40 50 60 Time (Minutes) --Pre -Development Hyd rogra ph -Total Post -Deve lopment Hydrograph Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 5-Year Storm Event :;-6.00 c 0 ~ 5.oo--~~~--+~~~~-+-~~~--+~~~~-+-~~~--+-~~~~-+-~~~----< (/) .... Cll a.. 4.oo--~~-~-+----"~~_,_~~~-t-~~~--t~~~~t--~~~-+-~~----< -Cll Cll ....... (,,) 3 .00--~----<---->-~~---".---t~~~~-+-~~~--+-~~~--+~~~~+-~~~~ ..c :l ~ 2 .00--~1----+~~---~-t--"~~~-+~~~~+--~~~--+~~~~+--~~~-; Cll QO .... ro 1.00 ..c (,,) "' 0 0.00 70 0 10 20 30 40 50 60 70 Time (Minutes) --Pr e-Development Hydrograph -Post -Develo pm ent Outflow Hyd rograph Without Detention Garrett Engineering · 4444 Garter Creek Parkway Sui te 108 ·Bryan , Texas 77802 ·Telephone : (979) 846-2688 · Fax: (979) 846-3094 · Page 13 -"'C c 0 u Q) In .... Q) 0.. -Q) Q) ... u ..c ::I (,) - -"'C c 0 u Q) In .... Q) 0.. -Q) Q) ... u ..c ::I Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 10-Year Storm Event 6.00 5 .00 4.00 3 .00 ~ 2.00 Q) bO .... ~ 1.00--++~~---t~~~~-+---''c-~---t~~~~-+-~~~---t~~~~-+-~~~--1 u "' 0 7.00 6 .00 5.00 4.00 3.00 0 10 20 30 40 50 60 Time (Minutes) --Pre · Development Hydrograph -Post .Development Outflow Hydrograph Without Detention Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 25-Year Storm Event 70 ~ 2.00 .... co .c u 1.00 "' c 0 .00 0 10 20 30 40 50 60 70 Time (Minutes) --Pre .Development Hydrograph -Post .Development Outflow Hydrograph Without Detention -"C c 0 u G) (/) .... G) ll.. -G) G) ..... u ..c ::I (.) - Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 50-Year Storm Event 8.00 7 .00 6 .00 5.00 4.00 3 .00 G) ~ 2.00 «I ..c u "' 0 1.00 0 .00 0 10 20 30 40 50 6 0 Time (Minutes) --Pre -Development Hydrograph -Post .Deve lopment Outf low Hydrograph Without Detention Total Pre-Development Vs . Total Post-Development (No Detention) Peak Discharge Rates 100-Year Storm Event -8.00 "C c 0 7.00 u G) (/) 6 .00 .... G) ll.. -5.00 G) G) ..... 4.00 u ..c ::I 3 .00 (.) - 70 ~ 2 .00 ---1--+-~~+--~~~--1--~'k-~--+~~~~-+-~~~~-1-~~~~+--~~~---1 .... «I "5 1.00 --.r+-~~~+--~~~--1~~-"c-----+~~~~-t-~~~~-1-~~~~+--~~~---1 "' 0 0.00 +-~~~-+~~~--1~~~--11-~~~-+-~~~-+~~~--t---~~__, 0 10 20 30 40 50 60 70 T i me (Minutes) --Pre · Development Hydrograph -Post ·Development Outflow Hydrograph Wit hout Detentio n Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan. Texas 77802 · Telephone: (979) 84&-2688 . Fax: (979) 846-3094 . Page 15 --Cl) Cl) LI. Elevation 311.50 312 .00 312 .50 313.00 314.00 314.25 Depth (Feet) 0 .00 0.50 1.00 1.50 2.50 2.75 Detention Pond Depth Vs. Volume Volume (Ft3) 0 78 492 1110 2657 3071 -:;; 1.50--~~~--1~~~~--+-~~~~1--~~~-+-~~~~+-~~~--+~~~---1 -c.. Cl) c 0 500 1000 1500 2000 2500 3000 3500 Detention Pond Volume (Cubic Feet) Garrett Engineering . 4444 Garter Creek Parkway Suite 108 · Bryan , Texas 77802 ·Telephone: (979) 846-2688 ·Fax : (979) 846-3094 · Page 16 Rating Curve For Outlet Control Structure De th Vs . Volume Elevat ion 311.50 3 12.00 312 .50 3 13 .00 314.00 314.25 Dept h (F eet) 0 .00 0 .50 1.00 1.50 2 .50 2 .75 Pipe Dia . 8 .00 (in .) 10.50 (Length In Feet) Disc harge Ft3/Sec 0.00 0 .46 1.32 1.81 2 .52 2 .66 Rating Curve For Outlet Control Structure Depth Vs. Volume --Q) Q) .... ~ 1.50--~~~~--+-~~~~~+--~~~~---+--~~-.~--t~~~~~-+-~~~~--t -c. Q) c 0 .00~~~~~-+-~~~~-+~~~~--t~~~~~+-~~~~ ...... ~~~~-1 0.00 0 .50 1.00 1.50 2 .00 2 .50 3 .00 Discharge (Cubic Feet Per Second) Garrett Engineering· 4444 carter Creek Parkway Sui te 108 · Bryan. Texas 77802 . Telephone: (979) 846·2688 . Fa x: (979) 846·3094 • Page 17 I Storage Indi cation Curve Depth Storage Discharge 2s/t 2s/t+O (Feet) (Ft3) (Ft3/Sec) (Ft3/Sec) (Ft3/Sec) 0 .00 0 0 .00 0.00 0.00 0 .50 78 0.46 2.60 3.06 1.00 492 1.32 16.39 17.71 1.50 1,110 1.81 37.00 38.81 2.50 2 ,657 2.52 88.58 91.10 2.75 3,071 2.66 102 .36 105.02 Storage Indication Curve -'tJ c 2 .00 0 u Q) (/) ... Q) 0.. -Q) Q) ..... 1.50 u .a ::I 0 -Q) bO ... co ..c u 1.00 Ill 0 0.00+-~~~~-+-~~~~ ..... ~~~~-+~~~~--1~~~~~~~~~--. 0 .00 20.00 40.00 60.00 80.00 100.00 120.00 2s/t+O (Cubic Feet Per Second) Garrett Engineering . 4444 carter Cree k Parkway Suit e 108 -Bryan, Texas 77802 -Telephone : (979) 846-2688 ·Fa x: (979) 846-3094 · Page 18 Inflow I Outflow Simulation 2-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.30 0.30 0.21 0.30 0.05 0.05 311.55 2 0.60 0.91 0.78 1.12 0.17 0.18 311.68 3 0.91 1.51 1.60 2.29 0.35 0.38 311.88 4 1.21 2.12 2.72 3.72 0.50 0.52 312.02 5 1.51 2.72 4.24 5.44 0.60 0.58 312.08 6 1.81 3.33 6.12 7.57 0.72 0.65 312.15 7 2.12 3.93 8.31 10.05 0.87 0.74 312.24 8 2.42 4.54 10.78 12.85 1.03 0.83 312.33 9 2.72 5.14 13.49 15.92 1.21 0.94 312.44 10 3.02 5.74 16.52 19.23 1.36 1.04 312.54 11 2.87 5.90 19.56 22.42 1.43 1.11 312.61 12 2.72 5.59 22.17 25.15 1.49 1.18 312.68 13 2.57 5.29 24.37 27.46 1.55 1.23 312.73 14 2.42 4.99 26.17 29.35 1.59 1.28 312.78 15 2.27 4.69 27.61 30.86 1.63 1.31 312.81 16 2.12 4.38 28.69 31.99 1.65 1.34 312.84 17 1.97 4.08 29.43 32.77 1.67 1.36 312.86 18 1.81 3.78 29.85 33.21 1.68 1.37 312.87 19 1.66 3.48 29.96 33.33 1.68 1.37 312.87 20 1.51 3.17 29.78 33.14 1.68 1.37 312.87 21 1.36 2.87 29.32 32.66 1.67 1.35 312.85 22 1.21 2.57 28.59 31.89 1.65 1.34 312.84 23 1.06 2.27 27.61 30.86 1.63 1.31 312.81 24 0.91 1.97 26.38 29.57 1.60 1.28 312.78 25 0.76 1.66 24.93 28.05 1.56 1.24 312.74 26 0.60 1.36 23.25 26.29 1.52 1.20 312.70 27 0.45 1.06 21.36 24.31 1.47 1.16 312.66 28 0.30 0.76 19.27 22.12 1.42 1.10 312.60 29 0.15 0.45 16.99 19.73 1.37 1.05 312.55 30 0.00 0.15 14.57 17.14 1.29 0.98 312.48 31 0.00 0.00 12.30 14.57 1.14 0.89 312.39 32 0.00 0.00 10.30 12.30 1.00 0.82 312.32 33 0.00 0.00 8.53 10.30 0.88 0.75 312.25 34 0.00 0.00 6.96 8.53 0.78 0.69 312.19 35 0.00 0.00 5.59 6.96 0.69 0.63 312.13 36 0.00 0.00 4.37 5.59 0.61 0.59 312.09 37 0.00 0.00 3.30 4.37 0.54 0.54 312.04 38 0.00 0.00 2.35 3.30 0.47 0.51 312.01 39 0.00 0.00 1.64 2.35 0.35 0.38 311.88 40 0.00 0.00 1.15 1.64 0.25 0.27 311.77 41 0.00 0.00 0.80 1.15 0.17 0.19 311.69 42 0.00 0.00 0.56 0.80 0.12 0.13 311.63 43 0.00 0.00 0.39 0.56 0.08 0.09 311.59 44 0.00 0.00 0.27 0.39 0.06 0.06 311.56 45 0.00 0.00 0.19 0.27 0.04 0.04 311.54 Garrett Engineering· 4444 Carter Creek Parl<way Suite 108 · Biyan, Texas 77802 ·Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 19 46 0.00 0.00 0.13 0.19 0.03 0.03 311.53 47 0.00 0.00 0.09 0.13 0.02 0.02 311.52 48 0.00 0.00 0.07 0.09 0.01 0.02 311.52 49 0.00 0.00 0.05 0.07 0.01 0.01 311.51 50 0.00 0.00 0.03 0.05 0.01 0.01 311.51 51 0.00 0.00 0.02 0.03 0.00 0.01 311.51 52 0.00 0.00 0.02 0.02 0.00 0.00 311.50 53 0.00 0.00 0.01 0.02 0.00 0.00 311.50 54 0.00 0.00 0.01 0.01 0.00 0.00 311.50 55 0.00 0.00 0.01 0.01 0.00 0.00 311.50 56 0.00 0.00 0.00 0.01 0.00 0.00 311.50 57 0.00 0.00 0.00 0.00 0.00 0.00 311.50 58 0.00 0.00 0.00 0.00 0.00 0.00 311.50 59 0.00 0.00 0.00 0.00 0.00 0.00 311.50 60 0.00 0.00 0.00 0.00 0.00 0.00 311.50 Garrett Engi.neering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 20 Inflow/Outflow Simulation 2-Year Storm Event 4.00 I \ 3 .50 I \ \ \ I \ \ 3.00 \ -"Cl c: I \ 0 c.J Q) V> \ ... Q) 2 .50 Q.. -I \ Q) Q) .... c.J \ ..c ::::s 2.00 (J -~ 0 :;:: -::::s 0 I 1.50 0 10 20 30 40 50 60 70 Time (Minutes) ---Pre-Development Hydrograph • • • Post -Deve lopment Outflow Hydrograph Without Detent ion -- --Post-Development 'Free -Flow' ---Post-Development Outflow With Detention Garratt Engi.-ring · 4444 carter Creek Parl<way Suite 108 · Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 • Page 21 Inflow I Outflow Simulation 5-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) {f"t~/~ec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.37 0.37 0.26 0.37 0.06 0.06 311.56 2 0.74 1.10 0.95 1.36 0.20 0.22 311.72 3 1.10 1.84 1.95 2.79 0.42 0.46 311.96 4 1.47 2.57 3.43 4.52 0.55 0.55 312.05 5 1.84 3.31 5.39 6.74 0.68 0.63 312.13 6 2.21 4.04 7.76 9.43 0.83 0.72 312.22 7 2.57 4.78 10.51 12.54 1.02 0.82 312.32 8 2.94 5.51 13.58 16.03 1.22 0.94 312.44 9 3.31 6.25 17.09 19.83 1.37 1.05 312.55 10 3.68 6.99 21.14 24.08 1.47 1.15 312.65 11 3.49 7.17 25.18 28.31 1.57 1.25 312.75 12 3.31 6.80 28.68 31.98 1.65 1.34 312.84 13 3.13 6.43 31.67 35.11 1.72 1.41 312.91 14 2.94 6.07 34.16 37.73 1.78 1.47 312.97 15 2.76 5.70 36.21 39.86 1.82 1.52 313.02 16 2.57 5.33 37.85 41.54 1.85 1.55 313.05 17 2.39 4.96 39.08 42.81 1.86 1.58 313.08 18 2.21 4.60 39.93 43.68 1.88 1.59 313.09 19 2.02 4.23 40.39 44.16 1.88 1.60 313.10 20 1.84 3.86 40.48 44.25 1.88 1.60 313.10 21 1.65 3.49 40.22 43.98 1.88 1.60 313.10 22 1.47 3.13 39.60 43.34 1.87 1.59 313.09 23 1.29 2.76 38.64 42.36 1.86 1.57 313.07 24 1.10 2.39 37.35 41.03 1.84 1.54 313.04 25 0.92 2.02 35.74 39.37 1.82 1.51 313.01 26 0.74 1.65 33.84 37.39 1.78 1.47 312.97 27 0.55 1.29 31.67 35.12 1.72 1.41 312.91 28 0.37 0.92 29.26 32.59 1.67 1.35 312.85 29 0.18 0.55 26.61 29.81 1.60 1.29 312.79 30 0.00 0.18 23.73 26.80 1.53 1.22 312.72 31 0.00 0.00 20.81 23.73 1.46 1.14 312.64 32 0.00 0.00 18.03 20.81 1.39 1.07 312.57 33 0.00 0.00 15.38 18.03 1.33 1.01 312.51 34 0.00 0.00 13.01 15.38 1.18 0.92 312.42 35 0.00 0.00 10.92 13.01 1.04 0.84 312.34 36 0.00 0.00 9.08 10.92 0.92 0.77 312.27 37 0.00 0.00 7.45 9.08 0.81 0.71 312.21 38 0.00 0.00 6.02 7.45 0.72 0.65 312.15 39 0.00 0.00 4.75 6.02 0.63 0.60 312.10 40 0.00 0.00 3.63 4.75 0.56 0.56 312.06 41 0.00 0.00 2.64 3.63 0.49 0.52 312.02 42 0.00 0.00 1.85 2.64 0.40 0.43 311.93 43 0.00 0.00 1.29 1.85 0.28 0.30 311.80 44 0.00 0.00 0.90 1.29 0.19 0.21 311.71 45 0.00 0.00 0.63 0.90 0.14 0.15 311.65 Garrett Engineering -4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 • Telephone: (979) 846-2688 · Fax.: (979) 846-3094 -Page 22 46 0.00 0.00 0.44 0.63 0.10 0.10 311.60 47 0.00 0.00 0.31 0.44 0.07 0.07 311.57 48 0.00 0.00 0.22 0.31 0.05 0.05 311.55 49 0.00 0.00 0.15 0.22 0.03 0.04 311.54 50 0.00 0.00 0.11 0.15 0.02 0.02 311.52 51 0.00 0.00 0.07 0.11 0.02 0.02 311.52 52 0.00 0.00 0.05 0.07 0.01 0.01 311.51 53 0.00 0.00 0.04 0.05 0.01 0.01 311.51 54 0.00 0.00 0.03 0.04 0.01 0.01 311.51 55 0.00 0.00 0.02 0.03 0.00 0.00 311.50 56 0.00 0.00 0.01 0.02 0.00 0.00 311.50 57 0.00 0.00 0.01 0.01 0.00 0.00 311.50 58 0.00 0.00 0.01 0.01 0.00 0.00 311.50 59 0.00 0.00 0.00 0.01 0.00 0.00 311.50 60 0.00 0.00 0.00 0.00 0.00 0.00 311.50 Garrett Engineering· 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77602 · Telephone: (979) 846-2688 · Fax: (979) 646-3094 . Page 23 -"Cl c 0 u QI en ... QI D.. -QI QI ..... u .Q :J (.) -~ 0 = -:J 0 Inflow/Outflow Simulation 5-Year Storm Event 5.00 ' ' ' ' 4 .00 ' ' ' ' 3 .00 ' ' ' ' 2.00 ' 1.00 ... ~-1-~-a'--,-+~''-.-~~~~+---'t--~~~-+-~~_...--~-+~~~~~~+-~~~~~-+-~~~~~---j ' ' ' ' ' ' ' ' ' ' ' ' ' ' 0 .00 ~~---------i------------~--------....;'.:t.------------i--------..::!11 ................ __________ _. 0 10 2 0 30 40 50 60 70 Time (Minutes) ---Pre-Deve lopment Hyd ro grap h • • • Post-D eve lo pment Outflow Hy d ro graph Without Deten tion • • • • • ·Post-Deve lopm en t 'Free-Flow' ---Post-Develop ment Outflow With Detenti on Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 · Telephone : (979) 846-2688 · Fax: (979) 846-3094 -Page 24 Inflow I Outflow Simulation 10-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.41 0.41 0.29 0.41 0.06 0.07 311.57 2 0.83 1.24 1.07 1.53 0.23 0.25 311.75 3 1.24 2.06 2.20 3.13 0.46 0.50 312.00 4 1.65 2.89 3.93 5.09 0.58 0.57 312.07 5 2.06 3.71 6.19 7.65 0.73 0.66 312.16 6 2.48 4.54 8.91 10.73 0.91 0.76 312.26 7 2.89 5.36 12.04 14.27 1.12 0.88 312.38 8 3.30 6.19 15.56 18.23 1.33 1.01 312.51 9 3.71 7.02 19.71 22.58 1.43 1.12 312.62 10 4.13 7.84 24.45 27.55 1.55 1.23 312.73 11 3.92 8.05 29.17 32.50 1.66 1.35 312.85 12 3.71 7.63 33.28 36.81 1.76 1.45 312.95 13 3.51 7.22 36.84 40.50 1.83 1.53 313.03 14 3.30 6.81 39.89 43.65 1.88 1.59 313.09 15 3.09 6.40 42.47 46.29 1.91 1.64 313.14 16 2.89 5.98 44.57 48.45 1.94 1.68 313.18 17 2.68 5.57 46.21 50.14 1.96 1.72 313.22 18 2.48 5.16 47.41 51.37 1.98 1.74 313.24 19 2.27 4.75 48.17 52.16 1.99 1.76 313.26 20 2.06 4.33 48.51 52.51 2.00 1.76 313.26 21 1.86 3.92 48.44 52.43 1.99 1.76 313.26 22 1.65 3.51 47.98 51.95 1.99 1.75 313.25 23 1.44 3.09 47.12 51.07 1.98 1.73 313.23 24 1.24 2.68 45.88 49.80 1.96 1.71 313.21 25 1.03 2.27 44.28 48.15 1.94 1.68 313.18 26 0.83 1.86 42.32 46.13 1.91 1.64 313.14 27 0.62 1.44 40.01 43.76 1.88 1.59 313.09 28 0.41 1.03 37.36 41.04 1.84 1.54 313.04 29 0.21 0.62 34.39 37.98 1.79 1.48 312.98 30 0.00 0.21 31.18 34.60 1.71 1.40 312.90 31 0.00 0.00 27.91 31.18 1.63 1.32 312.82 32 0.00 0.00 24.80 27.91 1.56 1.24 312.74 33 0.00 0.00 21.83 24.80 1.48 1.17 312.67 34 0.00 0.00 19.00 21.83 1.42 1.10 312.60 35 0.00 0.00 16.30 19.00 1.35 1.03 312.53 36 0.00 0.00 13.82 16.30 1.24 0.95 312.45 37 0.00 0.00 11.64 13.82 1.09 0.87 312.37 38 0.00 0.00 9.71 11.64 0.96 0.79 312.29 39 0.00 0.00 8.01 9.71 0.85 0.73 312.23 40 0.00 0.00 6.51 8.01 0.75 0.67 312.17 41 0.00 0.00 5.19 6.51 0.66 0.62 312.12 42 0.00 0.00 4.02 5.19 0.58 0.57 312.07 43 0.00 0.00 2.98 4.02 0.52 0.53 312.03 44 0.00 0.00 2.09 2.98 0.45 0.49 311.99 Garrett Engineering· 4444 Carter Creek Parl<way Suite 108 . Bryan. Texas 7781J2 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 Page 25 45 0.00 0.00 1.46 2.09 0.31 0.34 311.84 46 0.00 0.00 1.02 1.46 0.22 0.24 311.74 47 0.00 0.00 0.71 1.02 0.15 0.17 311.67 48 0.00 0.00 0.50 0.71 0.11 0.12 311.62 49 0.00 0.00 0.35 0.50 0.07 0.08 311.58 50 0.00 0.00 0.24 0.35 0.05 0.06 311.56 51 0.00 0.00 0.17 0.24 0.04 0.04 311.54 52 0.00 0.00 0.12 0.17 0.03 0.03 311.53 53 0.00 0.00 0.08 0.12 0.02 0.02 311.52 54 0.00 0.00 0.06 0.08 0.01 0.01 311.51 55 0.00 0.00 0.04 0.06 0.01 0.01 311.51 56 0.00 0.00 0.03 0.04 0.01 0.01 311.51 57 0.00 0.00 0.02 0.03 0.00 0.00 311.50 58 0.00 0.00 0.01 0.02 0.00 0.00 311.50 59 0.00 0.00 0.01 0.01 0.00 0.00 311.50 60 0.00 0.00 0.01 0.01 0.00 0.00 311.50 Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 Page 26 -"'C c 0 y Cll (/) ... Cll D.. -Cll Cll ..... y :.c ::I (,) -~ 0 ::: -::I 0 Inflow/Outflow Simulation 10-Year Storm Event ' I \ 5 .00 I \ \ I \ 4 .00 \ I \ \ ' I \ 3.00 I ' \ ' I \ 2.00 l .00...---1~---f-~-+-~----'--.-,~~-+-~-;-~~-t-~~~~-t-~~~~-t-~~~~-+-~~~~-i ' ' ' ' ' ' ' ' ' ' ' ' 0 .00 ~:....~~~~ ...... ~~~~~ ...... ~~~~....;'.-,.~~~~~ ...... ~~~~~;::s:!lll ................ ~~~~~..f 0 10 20 30 40 50 60 70 Time (Minutes) ---Pre .Developm ent Hydrograp h • • • Post.Deve lopment Ou tflow Hyd rogra ph Wit hout Detention --- - -·Post.Deve lopment "Fre e· Flow " ---Post ·Deve lop me nt Outf low With Dete nt ion Garrett Engineering · 4444 Garter Creek Par1<way Su ite 108 · Bryan, Texa s 77B02 ·Telephone: (979) 846-2688 ·Fax: (979) 846-3094 · Page 27 Inflow I Outflow Simulation 25-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.47 0.47 0.33 0.47 0.07 0.08 311.58 2 0.94 1.41 1.22 1.74 0.26 0.29 311.79 3 1.41 2.36 2.59 3.58 0.49 0.52 312.02 4 1.89 3.30 4.64 5.89 0.63 0.60 312.10 5 2.36 4.24 7.28 8.88 0.80 0.70 312.20 6 2.83 5.18 10.44 12.46 1.01 0.82 312.32 7 3.30 6.13 14.06 16.57 1.25 0.96 312.46 8 3.77 7.07 18.33 21.13 1.40 1.08 312.58 9 4.24 8.01 23.30 26.34 1.52 1.20 312.70 10 4.71 8.95 28.94 32.26 1.66 1.34 312.84 11 4.48 9.19 34.54 38.13 1.79 1.48 312.98 12 4.24 8.72 39.52 43.26 1.87 1.59 313.09 13 4.01 8.25 43.91 47.77 1.93 1.67 313.17 14 3.77 7.78 47.71 51.68 1.98 1.75 313.25 15 3.53 7.31 50.96 55.02 2.03 1.81 313.31 16 3.30 6.83 53.66 57.79 2.07 1.86 313.36 17 3.06 6.36 55.82 60.02 2.10 1.91 313.41 18 2.83 5.89 57.47 61.71 2.12 1.94 313.44 19 2.59 5.42 58.62 62.89 2.14 1.96 313.46 20 2.36 4.95 59.27 63.57 2.15 1.97 313.47 21 2.12 4.48 59.45 63.75 2.15 1.98 313.48 22 1.89 4.01 59.17 63.46 2.14 1.97 313.47 23 1.65 3.53 58.44 62.71 2.13 1.96 313.46 24 1.41 3.06 57.26 61.50 2.12 1.93 313.43 25 1.18 2.59 55.67 59.86 2.10 1.90 313.40 26 0.94 2.12 53.65 57.79 2.07 1.86 313.36 27 0.71 1.65 51.23 55.30 2.03 1.82 313.32 28 0.47 1.18 48.42 52.41 1.99 1.76 313.26 29 0.24 0.71 45.23 49.13 1.95 1.70 313.20 30 0.00 0.24 41.66 45.46 1.90 1.63 313.13 31 0.00 0.00 37.97 41.66 1.85 1.55 313.05 32 0.00 0.00 34.39 37.97 1.79 1.48 312.98 33 0.00 0.00 30.97 34.39 1.71 1.40 312.90 34 0.00 0.00 27.72 30.97 1.63 1.31 312.81 35 0.00 0.00 24.61 27.72 1.55 1.24 312.74 36 0.00 0.00 21.65 24.61 1.48 1.16 312.66 37 0.00 0.00 18.83 21.65 1.41 1.09 312.59 38 0.00 0.00 16.14 18.83 1.35 1.03 312.53 39 0.00 0.00 13.68 16.14 1.23 0.95 312.45 40 0.00 0.00 11.51 13.68 1.08 0.86 312.36 41 0.00 0.00 9.60 11.51 0.96 0.79 312.29 42 0.00 0.00 7.91 9.60 0.84 0.72 312.22 43 0.00 0.00 6.42 7.91 0.74 0.67 312.17 44 0.00 0.00 5.11 6.42 0.66 0.61 312.11 45 0.00 0.00 3.95 5.11 0.58 0.57 312.07 Garrett Engineertng. 4444 carter Creek Parkway Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 28 46 0.00 0.00 2.92 3.95 0.51 0.53 312.03 47 0.00 0.00 2.04 2.92 0.44 0.48 311.98 48 0.00 0.00 1.43 2.04 0.31 0.33 311.83 49 0.00 0.00 1.00 1.43 0.21 0.23 311.73 50 0.00 0.00 0.70 1.00 0.15 0.16 311.66 51 0.00 0.00 0.49 0.70 0.11 0.11 311.61 52 0.00 0.00 0.34 0.49 0.07 0.08 311.58 53 0.00 0.00 0.24 0.34 0.05 0.06 311.56 54 0.00 0.00 0.17 0.24 0.04 0.04 311.54 55 0.00 0.00 0.12 0.17 0.03 0.03 311.53 56 0.00 0.00 0.08 0.12 0.02 0.02 311.52 57 0.00 0.00 0.06 0.08 0.01 0.01 311.51 58 0.00 0.00 0.04 0.06 0.01 0.01 311.51 59 0.00 0.00 0.03 0.04 0.01 0.01 311.51 60 0.00 0.00 0.02 0.03 0.00 0.00 311.50 Garrett E~neerir"41 . 4444 Carter Creek Parl<way Suite 108. Bryan, Texas 77802 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 29 Inflow/Outflow Simulation 25-Year Storm Event 6.00 I \ ' I \ \ 5.00 I \ \ -"Cl c I \ 0 u Q) (/) 4 .00 ... Q) ~ -Q) I \ Q) ..... ' u \ ..Q ::I 0 I -; 3.00 ' 0 = -::I 0 \ I \ 2.00 1.00---1-~~~t--~~~,~-+-~--.-~~.--~~~---+"~~~~--+-~~~~+-~~~-----< ' ' ' ' ' ' ' ' ' ' 0.00 -11:....~~~~ ..... ~~~~~-+~~~~~':.+~~~~~-+~~~~~-+....;;::::::::! .......... ~~~~~--1 0 10 20 30 40 50 60 70 Time (Minutes) ---Pre· Development Hydrograph • • • Post -Development Outflow Hydrograph Without Detent ion -- -- -·Post-Development 'Free -Flow ' ---Post.Deve lopment Outf low With Detention Garrett Engineering -4444 carter Creek Parkway Suite 108 . Biyan, Texas 77602 ·Te lephone: (979) 846-2688 ·Fax: (979) 846-3094 · Page 30 Inflow I Outflow Simulation 50-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.53 0.53 0.37 0.53 0.08 0.09 311.59 2 1.07 1.60 1.38 1.97 0.30 0.32 311.82 3 1.60 2.66 3.01 4.04 0.52 0.53 312.03 4 2.13 3.73 5.38 6.74 0.68 0.63 312.13 5 2.66 4.79 8.42 10.18 0.88 0.74 312.24 6 3.20 5.86 12.05 14.28 1.12 0.88 312.38 7 3.73 6.93 16.27 18.97 1.35 1.03 312.53 8 4.26 7.99 21.32 24.26 1.47 1.16 312.66 9 4.79 9.06 27.15 30.38 1.61 1.30 312.80 10 5.33 10.12 33.72 37.27 1.77 1.46 312.96 11 5.06 10.39 40.35 44.11 1.88 1.60 313.10 12 4.79 9.86 46.28 50.20 1.96 1.72 313.22 13 4.53 9.32 51.52 55.60 2.04 1.82 313.32 14 4.26 8.79 56.11 60.31 2.10 1.91 313.41 15 4.00 8.26 60.05 64.37 2.16 1.99 313.49 16 3.73 7.73 63.37 67.78 2.20 2.05 313.55 17 3.46 7.19 66.08 70.56 2.24 2.11 313.61 18 3.20 6.66 68.20 72.74 2.27 2.15 313.65 19 2.93 6.13 69.74 74.33 2.29 2.18 313.68 20 2.66 5.59 70.72 75.34 2.31 2.20 313.70 21 2.40 5.06 71.16 75.79 2.31 2.21 313.71 22 2.13 4.53 71.07 75.69 2.31 2.21 313.71 23 1.86 4.00 70.46 75.06 2.30 2.19 313.69 24 1.60 3.46 69.35 73.92 2.29 2.17 313.67 25 1.33 2.93 67.75 72.28 2.26 2.14 313.64 26 1.07 2.40 65.68 70.15 2.24 2.10 313.60 27 0.80 1.86 63.14 67.54 2.20 2.05 313.55 28 0.53 1.33 60.16 64.47 2.16 1.99 313.49 29 0.27 0.80 56.73 60.96 2.11 1.92 313.42 30 0.00 0.27 52.89 57.00 2.06 1.85 313.35 31 0.00 0.00 48.88 52.89 2.00 1.77 313.27 32 0.00 0.00 44.99 48.88 1.95 1.69 313.19 33 0.00 0.00 41.20 44.99 1.89 1.62 313.12 34 0.00 0.00 37.52 41.20 1.84 1.55 313.05 35 0.00 0.00 33.96 37.52 1.78 1.47 312.97 36 0.00 0.00 30.56 33.96 1.70 1.38 312.88 37 0.00 0.00 27.33 30.56 1.62 1.30 312.80 38 0.00 0.00 24.24 27.33 1.54 1.23 312.73 39 0.00 0.00 21.30 24.24 1.47 1.15 312.65 40 0.00 0.00 18.49 21.30 1.40 1.08 312.58 41 0.00 0.00 15.81 18.49 1.34 1.02 312.52 42 0.00 0.00 13.40 15.81 1.21 0.94 312.44 43 0.00 0.00 11.26 13.40 1.07 0.85 312.35 44 0.00 0.00 9.38 11.26 0.94 0.78 312.28 45 0.00 0.00 7.72 9.38 0.83 0.72 312.22 Garrett Engineering. 4444 Carter Creek Parkway Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 31 46 0.00 0.00 6.25 7.72 0.73 0.66 312.16 47 0.00 0.00 4.96 6.25 0.65 0.61 312.11 48 0.00 0.00 3.81 4.96 0.57 0.56 312.06 49 0.00 0.00 2.81 3.81 0.50 0.53 312.03 50 0.00 0.00 1.96 2.81 0.42 0.46 311.96 51 0.00 0.00 1.37 1.96 0.30 0.32 311.82 52 0.00 0.00 0.96 1.37 0.21 0.22 311.72 53 0.00 0.00 0.67 0.96 0.14 0.16 311.66 54 0.00 0.00 0.47 0.67 0.10 0.11 311.61 55 0.00 0.00 0.33 0.47 0.07 0.08 311.58 56 0.00 0.00 0.23 0.33 0.05 0.05 311.55 57 0.00 0.00 0.16 0.23 0.03 0.04 311.54 58 0.00 0.00 0.11 0.16 0.02 0.03 311.53 59 0.00 0.00 0.08 0.11 0.02 0.02 311.52 60 0.00 0.00 0.05 0.08 0.01 0.01 311.51 Garrett Engineering . 4444 carter Creek Parl<way Suite 108 · Bryan. Texas 778-02 · Telephone: (979) 846-2688 · Fax: (979) 846-3094 · Page 32 :::> \.) :::> :..u :::> J1 :::> 0 0 0 ,, ,, ,, ,, ,, ,, ,, 0 0 ,, ,, ,, ,, ,, ,, N 0 0 Outflow (Cubic F'eet Per Second) ---- w 0 0 ---- -t:- 0 0 01 0 0 -. -------- .. " " " .. ~ 0 0 --- " .. -...J 0 0 OJ 0 0 ::I -0 ~ ........ 0 c -::: 0 ~ U> 3 c I» -0 ::I U1 0 I -< CD I» ""l U> -0 ""l 3 ITI < CD ::I - Inflow I Outflow Simulation 100-Year Storm Event Time Inflow 11+ 12 2s/t-O 2s/t+O Outflow Depth Elevation (Minutes) (Ft3/Sec) (Ft3/Sec) (Feet) 0 0.00 0.00 0.00 0.00 0.00 0.00 311.50 1 0.56 0.56 0.39 0.56 0.08 0.09 311.59 2 1.11 1.67 1.44 2.06 0.31 0.34 311.84 3 1.67 2.78 3.16 4.22 0.53 0.54 312.04 4 2.23 3.89 5.67 7.06 0.69 0.64 312.14 5 2.78 5.01 8.86 10.67 0.91 0.76 312.26 6 3.34 6.12 12.66 14.98 1.16 0.91 312.41 7 3.89 7.23 17.15 19.89 1.37 1.05 312.55 8 4.45 8.34 22.49 25.49 1.50 1.18 312.68 9 5.01 9.46 28.65 31.95 1.65 1.34 312.84 10 5.56 10.57 35.59 39.22 1.82 1.51 313.01 11 5.28 10.85 42.61 46.43 1.91 1.65 313.15 12 5.01 10.29 48.89 52.90 2.00 1.77 313.27 13 4.73 9.73 54.47 58.63 2.08 1.88 313.38 14 4.45 9.18 59.35 63.65 2.15 1.97 313.47 15 4.17 8.62 63.56 67.98 2.21 2.06 313.56 16 3.89 8.07 67.12 71.63 2.26 2.13 313.63 17 3.62 7.51 70.04 74.63 2.30 2.18 313.68 18 3.34 6.95 72.33 76.99 2.33 2.23 313.73 19 3.06 6.40 74.02 78.73 2.35 2.26 313.76 20 2.78 5.84 75.13 79.87 2.37 2.29 313.79 21 2.50 5.28 75.66 80.41 2.37 2.30 313.80 22 2.23 4.73 75.64 80.39 2.37 2.30 313.80 23 1.95 4.17 75.08 79.82 2.37 2.28 313.78 24 1.67 3.62 73.99 78.70 2.35 2.26 313.76 25 1.39 3.06 72.40 77.05 2.33 2.23 313.73 26 1.11 2.50 70.30 74.90 2.30 2.19 313.69 27 0.83 1.95 67.72 72.25 2.26 2.14 313.64 28 0.56 1.39 64.67 69.11 2.22 2.08 313.58 29 0.28 0.83 61.16 65.50 2.17 2.01 313.51 30 0.00 0.28 57.20 61.43 2.12 1.93 313.43 31 0.00 0.00 53.08 57.20 2.06 1.85 313.35 32 0.00 0.00 49.07 53.08 2.00 1.77 313.27 33 0.00 0.00 45.17 49.07 1.95 1.70 313.20 34 0.00 0.00 41.38 45.17 1.90 1.62 313.12 35 0.00 0.00 37.69 41.38 1.84 1.55 313.05 36 0.00 0.00 34.12 37.69 1.78 1.47 312.97 37 0.00 0.00 30.72 34.12 1.70 1.39 312.89 38 0.00 0.00 27.48 30.72 1.62 1.31 312.81 39 0.00 0.00 24.38 27.48 1.55 1.23 312.73 40 0.00 0.00 21.43 24.38 1.47 1.16 312.66 41 0.00 0.00 18.62 21.43 1.41 1.09 312.59 42 0.00 0.00 15.94 18.62 1.34 1.02 312.52 43 0.00 0.00 13.51 15.94 1.22 0.94 312.44 44 0.00 0.00 11.36 13.51 1.07 0.86 312.36 45 0.00 0.00 9.47 11.36 0.95 0.78 312.28 Garrett Engineering · 4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 34 46 0.00 0.00 7.79 9.47 0.84 0.72 312.22 47 0.00 0.00 6.32 7.79 0.74 0.66 312.16 48 0.00 0.00 5.02 6.32 0.65 0.61 312.11 49 0.00 0.00 3.87 5.02 0.57 0.57 312.07 50 0.00 0.00 2.85 3.87 0.51 0.53 312.03 51 0.00 0.00 1.99 2.85 0.43 0.47 311.97 52 0.00 0.00 1.39 1.99 0.30 0.33 311.83 53 0.00 0.00 0.97 1.39 0.21 0.23 311.73 54 0.00 0.00 0.68 0.97 0.15 0.16 311.66 55 0.00 0.00 0.48 0.68 0.10 0.11 311.61 56 0.00 0.00 0.33 0.48 0.07 0.08 311.58 57 0.00 0.00 0.23 0.33 0.05 0.05 311.55 58 0.00 0.00 0.16 0.23 0.04 0.04 311.54 59 0.00 0.00 0.11 0.16 0.02 0.03 311.53 60 0.00 0.00 0.08 0.11 0.02 0.02 311.52 Garrett Engineertng · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 • Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Page 35 -~ c 0 u QI (/) ... QI 0.. -QI QI ..... u ..Q ::::s (.) -~ 0 --::::s 0 7.00 6.00 I 5.00 I 4 .00 I 3.00 I 2.00 Inflow /Outflow Simulation 100-Year Storm Event I \ I ' I \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ' \ \ 1.00~-+-~-F-~--+~~~~'~,...+~~--\-~~1--~~~~-+-~~---~--+~~~~~+-~~~~--j \ \ \ \ \ \ \ \ 0.0 0 ~~~~~...a.~~~~~'--~~~~';.i..~~~~....j~~~~~"'--~~.;;:: ..... ~~~~--4 0 10 20 30 40 50 Time (Minute s) ---Pre -Deve lopment Hydrograph • • • Post -Development Outflow Hydrograph Without Detention ---Post -Development Outflow With Deten t ion -- - - -·Post -Deve lopment 'Free -Flow ' 60 70 Inflow/Outflow Simulation 2-Year Storm Event -"O c 0 1.50 <.> Q) en ... Q) 0.. -Q) Q) ..... <.> ..Q ::I u ..... ~ 0 1.00 :;: -::I 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Development Hydrograph -Total Post -Development Hydrograph Garrett Engineering · 4444 Carter Creek Parkway Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 37 Inflow/Outflow Simulation 25-Year Storm Event -"Cl 2.50 c 0 u Cl) (/) ... Cl) 0.. -Cl) Cl) 2 .00 ..... u ..c ::I 0 -~ 0 :: -1.50 ::I 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -To t al Post-Development Hydrograph Garrett Engineering · 4444 carter Creek Par1<way Suite 108 . Bryan, Texas 77802 . Telephone: (979) 846-2688 . Fax: (979) 846·3094 . Page 40 -"'C c Q u cu Inflow/Outflow Simulation 5-Year Storm Event ~ 2 .00 ... ~~~~-+~~-\~--l~~--'l-~+-~~~~+-~~~~-+-~~~~---+~~~~--l cu 0.. -cu cu ..... u .c ::I (.) ; 1.50 Q :;: -::I 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Development Hydrograph -Total Post-Development Hydrograph Garrett Engineering . 4444 carter Creek Parkway Suite 108 -Bryan, Texas 7781J2 -Telephone: (979) 846-2688 • Fax: (979) 846-3094 . Page 38 -"'C c 0 u GI en ... GI Q. -GI GI ..... u .J:l = <.J 2 .00 ';' 1.50 0 = -= 0 0 Inflow/Outflow Simulation 10-Year Storm Event 10 20 30 40 50 60 70 Time (Minutes) --Pre -Development Hydrograph -Total Post -Development Hydrograph Garrett Engineering · 4444 carter Creek Parkway Suite 108 · Bryan, Texas 77802 · Telephone: (979) 846-2688 . Fax: (979) 846-3094 . Page 39 Inflow/Outflow Simulation 100-Year Storm Event 3.50 -"'C c 0 3 .00 u Q) en ... Q) D.. -Q) Q) 2.50 ..... u :.a ::s 0 -~ 0 2 .00 ;;:: -::s 0 1.50 0 10 20 30 40 50 60 70 Time (Minutes) --Pre -Developm ent Hydrograph -Total Post -Deve lopm en t Hyd rograph Garrett Engineerine -4444 carter Creek Parl<way Suite 108 -Bryan , Texas 77802 -Telephone: (979) 846-2688 -Fax: (979) 846-3094 -Page 42 Inflow/Outflow Simul ation SO -Year Storm Event 3.00 -"Cl c 0 u Q) (/) ... 2.50 Q) D.. -Q) Q) ..... u .D ::::s 2.0 0 u -~ 0 :;:: -::::s 0 1.50 0 10 2 0 30 40 50 60 70 Ti me (Minutes ) --Pre -Development Hydrograph -Total Post-Development Hydrograph Garrett ~i Mering · 4444 carter Creek Parkway Suite 108 • Bryan, Texas 77802 -Telephone : (979) 846-2688 · Fax: (979) 846-3094 · Page 4 1 Detention Pond Storage Volumes as Percent of Maximum Volu me 703 Q) E ::s 603 0 > E ::s E ·;;c 503 C'O ~ -0 -c Q) 403 u ... Q) ~ 303 2 -year 5-year 10-year 25 -year 50 -year 100-year Des ign Storm Storm Simulation Synops i s 2 -ear 5 -ear 10-ear 25 -ear 50-ear lQQ -~ar Storm Depth 1.37 1.60 1.76 1.98 2.2 1 2.3 0 Storm Elevation 312.87 313.10 313.26 313 .48 313.71 313.80 Storm Vo lume 949 1239 1515 1848 22 04 2341 Maximum Capacity 30 71 3071 3071 30 71 3071 30 71 Percent of Capacity 313 403 493 60 3 723 763 Garrett Engineering · 4444 Carter Creek Parkway Suite 108 -Bryan, Texas 77802 -Telephone : (979) 846-2688 . Fa x: (979) 846-3094 . Page 43 0.665 Acres VJ Tributary B -0 .712 kres Post Development Impervious Area 0 .536 Acres - Post Development Pervious Area 0 . 129 Acres Pre-Development Impervious Area 0 .048 Acres --n S 68°55•33• W*240.SS'(Ad:.&.. Plat) lUJININ'~!Rl~~TI1 !D)!Rl~~~ (~IHI 00) GARRETI ENGINEERING Consulting Eng ineering & Land Surveying «44 Corter Creek Parkway Suite 108 Bryon, Texas 77802 Telephone : (979) 846 -2688 Fox : (979) 846 -3094 Post Development Impervious Area 0 .584 Acres Post Development Pervious Area 0 .128 Acres Pre-Development Impervious Area 0.076 Acres OWNER I DEVELOPER : Buffalo Wild Wi ngs c/ o C-J STONE, INC . P.O . Box 628/ 717 Ave.B Somerville, TX 77879 Tel : (979) 255-5180 Fax : (979) 596-1285 Scale: 1 " = 40' 317.1 I w ~ ;;., 0 0 ... N en Bp•317.~ Exhibit A GARRETI ENGINEERING Consulting Engineering & Land Sunl'l!yfng «-« Carter Creek Pakway Suite 108 Br)(Jn, Texas 77802 Telephone : (979) 846 -2688 Fax : (979) 846 -3094 Scale: 1" = 30' Tributary A -Total 0.665 Acres Post Development Impervious Area 0 .536 Acres Post Development Pervious Area 0 .129 Acres Pre-Development Pervious Area 0 .129 Acres •Free Flow" Area = 0 .071 Acres (area not flowing in to the detention pond) OWNER I DEVELOPER: Buffalo Wild Wings c/ o C-J STONE, INC. P.O. Box 628/ 717 Ave.B Somerville, TX 77879 Tel : (979) 255-5180 Fax: (979) 596-1285 "Free Flow" Pervious Area 0 .045 Acres "free Flow" ervious Area 0 .026 Acres \ ExhibitB IS); 155"9J£d±/ l50"91£-'lrru z I 1 -a:r ...... lO"llt£-CU -... t.£"1iit£-d.J. .... St "9t£-O.l _.,. Tributary B -0.712 Acres Post Development Impervious Area 0.58-4 Acres Post Development Pervioua Areo 0. 128 Acres Pre-Development Impervious Areo 0.076 Acres "Free Flow · Area = 0.159 Acres (area not flowing in to the detention pond) ·Free Flow• Pervioua Area 0.012 Acres II ~ 11,,.(' "Free Flow• ~ f)C'Pervioua Area 0.1-47 Acres ~e: 1" -30'1 GARRElT ENGINEERING ~ ~ • Land Slno)lng -c.t.r a--......_ ..... , .. ._ T-7180i2 T....,._ : (17'1) 848 -- F• : (171) Ml -J0'4 "IJO!lDoWI] ~d liu!la!x3 ...... '2!!"PllC!=.,,,=Pl=PI!=' 10.5 Ltt.) QWtER I [)E\lf] OPfB · Buffalo Wild Wings c/o C-J STONE. INC . P.O. Box 828/ 717 Jwe.B SometvTile, TX nB79 Tel : (979) 255-5180 Fox: (979) 596-1285 • 1 ~ I I ~ I I I ExbibitC 1. 2 . 3. 4. ENGINEERS ESTIMATE For Water Im proveme nt s To Buffalo Wild Wings, 903 University Drive East College Station , Brazos County , Texas * September, 2004 * 4" D iameter C900 -Class 200 139 L.F. $20 .00 P.V.C . Water Line 4" X 2" X 2" Tee 1 EA. $150.00 6 " x 4" M.J . Reducer 1 EA. $150.00 4" x 90° M. J . Bend 2 EA. $220.00 Total Construction Costs For Water Improvements: Engineering Costs (10%): Total Cost: $2 ,780.00 $150.00 $150.00 $440.00 $3 ,520.00 $352 .00 $3 ,872 .00 Garrett Enginaoong • 4444 Carter Creek Pai1<way Suite 108 • Bryan. Texas 77802 •Telephone: (979) 846-2688 • Fax: (979) 846-3094 ~-~ DEVELOPMENT PERMIT PERMIT NO . 04-34A Project: BUFFALO WILD WINGS COLLl(;l STATION FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA RE : CHAPTER 13 OF THE COLLEGE STATION CITY CODE SITE LEGAL DESCRIPTION: University Park, Phase Ill Lot 3C-R Block 5 DATE OF ISSUE: 08/13/04 OWNER: University Land Partnership 2508 Merrimac Court College Station , Texas 77840 TYPE OF DEVELOPMENT: SPECIAL CONDITIONS: SITE ADDRESS: 903 University Drive E DRAINAGE BASIN: Burton Creek VALID FOR 3 MONTHS CONTRACTOR: Clearing and Grading Permit All construction must be in compliance with the approved construction plans All trees required to be protected as part of the landscape plan must be completely barricaded in accordance with Section 7.5 .E., Landscape/Streetscape Plan Requirements of the City's Unified Development Ordinance , prior to any operations of this permit. The cleaning of equipment or materials within the drip line of any tree or group of trees that are protected and required to remain is strictly prohibited. The disposal of any waste material such as, but not limited to , paint , oil , solvents , asphalt, concrete , mortar, or other harmful liquids or materials within the drip line of any tree required to remain is also prohibited . TCEQ PHASE II RULES IN EFFECT. The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construction site in accordance with the approved erosion control plan as well as the City of College Station Drainage Policy and Design Criteria . If it is determined the prescribed erosion control measures are ineffective to retain all sediment onsite , it is the contractors responsibility to implement measures that will meet City, State and Federal requirements . The Owner and/or Contractor shall assure that all disturbed areas are sodden and establishment of vegetation occurs prior to removal of any silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any disturbed vegetation be returned to its original condition , placement and state . The Owner and/or Contractor shall be responsible for any damage to adjacent properties , city streets or infrastructure due to heavy machinery and/or equipment as well as eros ion , siltation or sedimentation resulting from the permitted work . In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure that debris from construction , erosion , and sedimentation shall not be deposited in city streets , or existing drainage facilities. I hereby grant this permit for development of an area outside the special flood hazard area . All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer in the development permit application for the above named project and all of the codes and ordinances of the City of College Station that apply. Date 6-tc,-oy Date DATE, TIME FAX NO./NAME DURATION PAGE(S) RESULT MODE TRANSMISSION VERIFICATION REPORT 08/23 09:54 98453094 00:01:39 03 OK STANDARD ECM TIME : 08/23/2004 09:55 NAME : COCS DEVELOPMENT SER FAX : 9797543495 TEL : 9797543570 SER.# : BROE2J341073 -----=----CJ~ :vvJ -·OrffD\ct";JJ--~'l \ ~'iJ\[L: rvw ff=::\ 1\0 701 -g_t_Qf'{ L"'Q QJV")fLC>WJ -))~~ )¥--V ~s--L>J.1?\:J e "2'1Q1<; a+-l.Db'J -~ IA:! O dVSV fie1daH D M0!A0J JnoA Jo~ iuafiln D :siµewaH UO!lBlS abaflO~ !0 Al,8 :/\uedwo~ ots~ -FIL :aUOLfd ~ki1~ \~ :woJ.:1 >~ =-41?' 2)'2ttJtj :AuedWO:'.) f;"b,Q ~ _, )J-0 :xe:1 -o.._HJ~ :OJ_ ·1-e»!Wsue.q .Meu e JOJ. .A1~e1peww1 aowo Jno 11eo gsee1d ·~J 9l9tdwoo e eAtw.>aJ JOU P!P no.h J.1 '?'-J9AOO D0DntQUI !lARP.rl tn -H. I ...-. ;>;. ~ t= .,.... .......... FACSIMILE COVER SHEET CITY OF COLLEGE STATION DEVELOPMENT SERVICES 1101 Texas Avenue South, PO Box 9960 College Station, Texas 77842 Phone (979)764-3570 I Fax (979)764-3496 Date: C?2Y'&o ~ #of pages included cover _3 __ If you did not receive a complete fax, please call our office immediately for a new transmittal. To: ~J)\O._ Fax: 0-f C:,-3 09 '{- Company: fu!Z. Q d. I -~ · From: ili_e_v\ Gatbrt Phone: l ~c.f -;Ssr10 Company: City of College Station Remarks: D Urgent ~or your review D Replay ASAP D FYI ~ ~ -tcioq -+o <vl2l{Z_a1.1 f\Sl)n .Dz~ 'i -SIQ ~{Llc[ ~l\ kltpRia.c~ -Cms1J2u.c:J:t (}(] t:LDTE- "R2" HANDICAP RAMP Pr-operty Une Begin w i th STA 0+00 At Exlati ng Mein Lin• STA 1 +77 .e5 -6"x6"xe" M .J. Tee Gote Volve W i th Box & e" P l ug -~Hlt--Beg i n STA 0+00 Remove 6" Plug lR 0 lnaert e" x .3" Reducer FL-.31 1 .92 ond Begin 3" Olo S D~ 2...1 1 A-ST D "22..L/ I ~? a;e Cloaa 200 PVC Wote,. L i ne o+oo \ Scale : Horl zontol : 1 " -20' Vert l col : 1 " -~· • REVIEWED FOR COMPLIANCE x-t" AUG 2 0 2004 U· COLLEGE STATION ENGINEERING APPLICANT : Char1es Stone C.J STONE, INC . P.O. Box 82&' 717 Ave .B Somervtlle, TX n879 Tel : (979) 256-5180 Fax : (979) 518-1285 GRADING PLAN for Buffalo Wild Wings Restaurant 1.38 ACRE TRACT LOT3CR UNIVERSITY PARK PHASED Volume 54~ 1, Page 49 Richard Carter League, A-8 College Station, Brazos County, Texas Scale 1" = 20' May 2004 ENGINEERING CoJUUiti.D.1 ~eerizl6 It Land Surre7'n6 "" ca.n.r Cnek Phy. m. 1oe, .ar,,u. n-7'780a f'U_-y:::f-. \'.?,n0f")} ffitA ~-t I ,,it-f o 0 LI) LI) O"I "it N w M "it M 0 0 T"-4 N Cf) ~0 .1 7 IT9.67 120 .oe ml.58 -. ............ ~~;r" •n.,' :::::::::::::~~·~c~ -·e· TRACTION GROYES _. __... 06" O.C. UP f'ACE 1;r x 1 1rr x -s ... r TIW:'1ION -/ ... O.C. UP '"" Of -· Of' RAMP . cru1 -~ -llfl!I -"*") DETAIL "R1" -HANDICAP RAMP "R2" HA N.T.S. Ul/11 1 .3' Domeatlc Wa,erAlnel l~:A'! 1!>' F'lre Un• Eaaement to Bldg i ... / I'll "'! -; . ~--~u • ~-- Dt:=-;;;-:-~To.'3 ~~ '2 . . ~i ~ ,·---/I ,,-3" '<•• ~~~~k~oo .c;·:: .,.. ·• :ll'· ' .jii •• ... •, U '-I• 0 ·· .,,._'(i '-12~ ----ry.:f ·-· --"?! " o+eo _!_----e+;;- L ~3 · F'i r•-~prlnkler L i n.---·.S ------- ;to Bldg . . fff'/ ~====:::!JI ~ '",;rp-.314.10 I' I I "'\ tl I ': -e- I OD >( 3 ... Reducer w----• 0+20 ( --e : .-------'---. ..... ------->I. O -t STA 0+00 6" >< .3 .,., ReQlii'.cer [\ w co Begin 3 " Dia . ~-C'fdaa ' t N 200 P .V .C . Water Line c -t F'L -.31 1 .92 -i + -~ \,; .,... ~-..,._t=-·== I---f-· ·-._ -- • .:: ... _ii: ~:--~-.. o -~:: --~-~ -- ==:Ill .4J ,._ -· -·.- 1--1-----~- 1 +40 1 +20 1+00 ( Not--to-ScA l •) s· ... 11•· -------.....----· .......... _ ......... __ Sidewalk ~ 1:::1 Ace••• Drive SIQpe 1 .0" ~--'1. -- ·- I~ ..... ·---1 ... I~ ... Clo . C aee 20 l P .V .C. Wa er l ne --·-L"! ---:, ------- o+eo 0+60 0+40 0+20 o+oo I I I 7 I:~ : I • ~ v~ relocation) ,. . tj' ... ,. D .. ~~~ relocotloo\) >ereloco*I) 111' ......... :.·· ~J :, ... ·. T ew•lk ~ ll:h axlltlng curb Ind pavement s ' ~ El.~~ }'.lE:W ~ _,. ... 1/4' J A ~ ·----"' ~ ~~ ' ~ ...... > rM.~ ! ';i , ... l.C:..-.W<~ Tw .. 11 ERQEIU; INLET CONTROL STRUCTURE < Not-w-ka ••> 1 I 7' •'U' -I l'O IUICll SECTION A-A DISSIPAIDR ~ DISSIPATOR BLOCK LOCATION FOR END'n'ALLS <~I•> f'U- --------------------' Fire Flow Report To Accompany the Site Plan of Buffalo Wild Wings 903 University Drive East College Station, Brazos County, Texas Prepared Bv: Garrett Engineering 4444 Carter Creek Parkway, Suite 108 Bryan, TX 77802 Phone : (979) 846-2688 Fax : (979) 846-3094 Fire Flow Report To Accompany the Site Plan of Buffalo Wild Wings 903 University Drive East College Station, Brazos County, Texas Fire Flow Capacity Calculations According to the City of College Station Flow Test Report dated June 14, 2004 the flow rate of FH# B-024 tested at 1455 GPM. See Attached Report. This building is Type IIB construction according to the International Building Code and is 6000 Sq.Ft. As such, looking at Table B 105.1, Minimum Required Fireflow and Flow Duration for Buildings, from the 2000 International Fire Code, the required Fireflow per minutes is 1750 GPM. An reduction in required Fire Flows by 50% is allowed when the building is Equipped with an approved atuomatic sprinkler system. The prposed building is to be sprinkled thus reducing the required Fire Flow is (1750 GPM * 50%= 875 GPM. The required 875 GPM for this construction is less than the available 1455 GPM, so therefore we can conclude that the proposed building has adaquate fire protection Waterisute Power is Progress Service is Pride ~illI111!1IJ(!!]J[DJNj C ornrnun lfy C)l..o,mad 1601 GRAHAM ROAD COLLEGE STATION TEXAS 77845 979-764-3435 Date: 14 JUNE 2004 FLOW TEST REPORT Nozzel size: 2.5 inch Location: 901 UNIVERSITY DRIVE E Flow hydrant number: B-024 Pitot reading: 75 (GPM): 1455 Static hydrant number: B-019 Static PSI: 85 Residual PSI: 84 t'ENDIX B FIRE-FLOW REQUIREMENTS FOR BUILDINGS . . TABLE 8105.1 MINIMUM REQUIRED FIRE FLOW AND FLOW DURATION FOR BUILDINGS FIRE AREA (square feet) FIRE FLOW FLOW Type IA and 10• Type llA and lllA" Type IV and V-A• Type JIB and lllB" Type v-e• (gallons per minute)" DURATION (hours) 0-22,700 0-12.700 0-8.200 0-5 .900 0-3.600 1.500 22 . 701-30.200 12.701-17.000 8.201-10.900 5.901 -7.900 3.601-4.800 1.7 50 30.201-38.700 17 .001-21.800 I 0.901-12.900 7.901 -9.800 4.801-6.200 2.000 38,701-48.300 21.80 1-24 .200 I 2. 90 I -17.400 9 .801-12.600 6.201-7.700 2.250 2 48.301-59.000 24.201 -33.200 17.401-2 U<XJ I 2.60 I -15 .400 7.701-9.400 2.500 59,00 I-70.900 33.20 1-39.700 21.301-25.500 15.401 -18.400 9.401-11.300 2.750 70.901-83. 700 39.70 1-47 .100 25.501-30.100 18.401-21.800 I 1.30 I -I 3.400 :i .ooo 83.701-97,700 47,101-54.900 30.10 l-."15 .200 21.8 0 1-25.900 13.401 -15.600 ."1 .250 3 97. 701-1 I 2.700 54. 90 1-63 .400 35 .201-40.600 25 .901 -29 . ."100 15.601-18 ,000 3.500 112 .701-128.700 63.401-72.400 40.601-46.400 29.30 1-33 .500 18.001 -20.600 3.750 128.701-145 .900 72.401-82.100 46.401-52 .500 . •3 .50 1-37.900 20.601-23 .300 4 .000 . 145 .901-164,200 82.101-92.400 52.501-59 .100 )7. 90 I -·E 700 23 .301-26.300 4.250 164 .201-183.400 92.401-103 .100 59. I 01-66.000 42.701-47 .700 26 . ."101-29.3 00 4.500 183.401-203.700 103.10 1-114.600 66.00 I -7 3 .. '00 47 .70 1-53 .000 29 .301-32.600 4 .750 203.701-225.200 114 .601-126.700 73.301-81.100 53.00 1-58.600 32 .601-36.000 5.000 225.201-247.700 126.701-139.400 81.101-89.200 58.601-65.400 36 .001-39.600 5.250 247.701-271.200 139 .40 I -15 2.600 89 .201-97 .700 65 .40 I -70.600 39 .60 I -4 :'-400 5.500 271.201-295.900 152.601-166.500 97 . 70 I -I 06.500 70.60 I -77 .000 43.401-4 7.400 5.750 295.90 !-G reater 166.50 I -G reater I 06.501-115 .800 77.(XJl -X."1.700 47.401 -51.5 00 6 .000 4 --115.801-125.500 83 .701-90.600 51.501-55 . 700 . _ _fi .250 .. ~ --125.501-135 .500 90.601-97.900 55. 701-60.200 6 .500 --135.501-145 .800 97.90 1-106.800 60.201-64.800 6. 7 50 --145 .801-156 . 700 106.8 01 -1 13 .200 64.801-69 .600 7 .000 --156. 701-16 7.900 113.201-121.300 69.60 !-74.600 7.250 --167 .901-179.400 121 .301-129 .600 74 .60 !-79 .800 7 .500 --179.401-191.400 129.601-138 .300 79 .801-85 .100 7. 7 50 --191.40 I -Greater 138.30 I -Greater 85 . l 0 ! -Greater lUJOO For S I: I square foot= 0 .0929 111 2• I gallon per minute= .1 .7 X5 IJm . I p11u 11J per square inch= 6 .8')) ~Pa . a . Types of construction are hascd o n the /111emuti1111al /J111/di11 g Codi·. b. Measured at :!O psi . 358 2000 INTERNATIONAL FIRE CODE® "'""'''"I r n 1•1,..,. 'I Vl 'I M\..' "1 '--"'-J'-''-'-"' SQencer ThomQson -Buffalo WW From: To: Date: Subject: Chris , Spencer Thompson Chris Haver; Lance Simms 6/24/2004 3 :41 :02 PM Buffalo WW I looked at the water again . The hydrant on the adjacent hotel s ite covers this project. It does not look like they w ill have to replace the hydrant at the entrance before a full blown BP is issued . st Page 1 S encer Thomi:_:ison -Universitl' Park Access From: To: Date: Subject: Spencer Thompson Kelly Templin 3/3/2004 4 :02 :07 PM University Park Access We received a fax from Jim Woods office about a Buffalo Wings restaurant going in . In the PAC we required cross access , as shown on the plat, with the adjacent hotel. Basically they screamed bloody ..... . One issue is grade , which I don't see as a problem . Second is the 20-ft "reserve area" along Univ Dr due to the overlay . I think we might have to do a little give and take (fudge) on this area to get the cross access. No one can go east from T-bone Jones over until this driveway; which is slated to be a signal later on . They may be contact ing you . If you need us to 'spla in our actions before hand let us know. st CC: Jane Kee ; Jennifer Reeves ; Ken Fogle ; Natalie Ruiz Page 1 S12encer Thom12son -Re : Universit):' Park Phase 2 From: To: Date: Subject: Spencer Thompson Deborah Grace 3/5/2004 10:47:43 AM Re : University Park Phase 2 They need an engineer's estimate for the infrastructure and a bond . st Spencer G . Thompson , Jr. Engineering Services City of College Station PO Box 9960 College Station , TX 77842 Ph . 979 .764 .3570 Fx. 979 .764 .3496 www.cstx.gov »> Deborah Grace 3/5/2004 10:40:30 AM »> lots 3-C-R , 3D-R , 3-E & 3-F . Melinda with Garrett is calling about this one . "No matter how little money and how few possessions you own , having a dog makes you rich ." -Louis Sabin -·-·-·-·-·-·-·-·-· Deborah Grace ><> Staff Assistant City of College Station Development Services 1101 Texas Avenue College Station, Texas 77840 979-764-3570 Main 979-764-3784 Desk 979-764-3496 Fax dgrace@cstx.gov www.cstx.gov -*-*-*-*-*-*-*-*-* Page 1 Si;>encer Thomi;>son -Buffalo Wild Wings From: To: Date: Subject: Spencer, "Garrett Engineering" <admin@garrettonline .net> <Sthompson@cstx.gov> 6/17/2004 2 :53 :09 PM Buffalo Wild Wings I looked at the plat for University Park, Section II , Block 5 , Lot 3A , aka , the State Farm property next door and there's not 20 ' PUE along the right-of-way . If I understood you correctly the other day the fire hydrant could not be within the right-of-way correct? If that is true then we would have to relocate the FH within one of our medians close enough to serve State Farm . I want to understand this correctly so I have the plans corrected for your review by tommorows deadline. Thanks , DeAnna Page 1 SJ=>encer ThomJ=>son -Fireline Easement Dedication From: To: Date: Subject: "Garrett Engineering" <admin@garrettonline.net> <Sthompson@cstx.gov> 612812004 1 :59 :27 PM Fireline Easement Dedication I have prepared an exhibit with metes and bounds for the fireline easement. How does the easement process work? I believe you wanted the easement dedication form filled out for a temporary blanket easement for the fireline prior to building permit. A blanket easement would not require meets and bounds ; however the developer would whether issue a specfic easement for the waterline requiring metes and bounds. Please let me know something so I get get these turned into you . Also , If the SWP3 meets the requirements , can we recieve the clearing and grading permit at this time? Thanks , DeAnna CC: <CStone8523@aol .com> Page 1 Spencer Thomi:ison -Fire Flow Calculation From: To: Date: Subject: Spencer Thompson ddgar@txcyber.com 6/15/2004 11 :53 :04 AM Fire Flow Calculation Spencer G . Thompson, Jr. Engineering Services City of College Station PO Box 9960 College Station, TX 77842 Ph . 979 .764 .3570 Fx. 979 .764 .3496 www.cstx .gov Page 1 S~encer Thom~son -Fwd: Flow Test h)'drant 8-024 From: To: Date: Subject: Spencer Thompson ddgar@txcyber.com 6/15/2004 11 :49:25 AM Fwd : Flow Test hydrant 8 -024 Th is is the hydrant at your driveway and University. st Spencer G . Thompson , Jr. Engineering Services City of College Station PO Box 9960 College Station , TX 77842 Ph . 979 .764 .3570 Fx . 979.764.3496 www.cstx .gov Page 1 FOR OFFICE USE O~L Y Case No . f.J'f-3 4- Date Submitted /0-J 5 -Qlf DEVELOPMENT PERMIT MINIMUM SUBMITTAL REQUIREMENTS $200.00 developm ent permit fee . Dra inage and erosion control plan , with supporting Drainage Report two (2) copies each , f( Notice of Intent (N.0 .1.) if disturbed area is greater than 5 acres ~~.___ ____________________________ ___... Date of *Required Preapplication Conference: __________________ _ *(Required for areas of special flood hazard) LEGAL DESCRIPTION Lo-r 3C-R l l.An'1VQ'~~a.rK., ?~s~lLC APPLICANT'S INFORMATION (Pr imary Contact for the Project): Name t:J=±A~Lt~ S"TOl-1£ E-Mail ___________ _ Street Address -P. D' ~ b Z.B City ~r\..f\ \ \<.,... State \X ----.~----Zip Code le '2:>_1~9~-- Phone Number ~79) "'2-~S-? I e 0 Fax Number _______ (~9_7~9~l ~G.~~~~-·-l'2_e_~_ PROPERTY OWNER 'S INFORMATION : Name Un\ \J e-<S ...f.-'1 ~ -PoJ..\-00'.S\hp -Ma il __________ _ Street Address 2. C:,o t!> /\..-( (;;('r"' i t'Y\..A.. '-Co u...r-t City l,o L.L-GGt r;;; ~Qt-{. State · -\'E::-1('. • Zip Code / i ~ 0'"2- Phone Number (~7'}) b9~ ... ikL.7 Fax Number (979) £!.~-~133 ARCHITECT OR E ~~1 ~ifE ~·s~1dRM~TI&/1 Name 0A=tZ.l?.0:rr '2:-N..Gt< ,.Jr;Gg_tM4 E-Mail dd jax=@~ c...1bt:!K. ~a. Street Address 4:4-~4-C.,p.¢...-1l?f2...c_.~~ :P~k-\.Va-y ~L"'T""E-Loe City ~'1 !Pq.J State -t;x Zip Code --J7 r?O'Z- Phone Number (!7~) £P+b ... ~'09 Fax Number ("!!f!J7P) E34-b-309+ Application is hereby made for the following development specific site/waterway alterations : ACKNOWLEDGMENTS : C.-tfi\[l..1..EiS ~C:. I, __ , design enginee ~hereby acknowledge or affirm that: The information and conclusions contained in the above plans and supporting documents comply with the current requ ireme nts of the City of College Station , Texas City Code, Chapter 13 and its associated Drainage Policy and Design Standards . ci.J__p ~.. () 4--A-(,-_ /&,/. Property Owner(s) '--- Development Permit 07 /02 /03 1 o f2 As a cond ition of approval of this permit application , I agree to construct the improvements proposed in this application according to these documents and the requirements of Chapter 13 of the College Station City c~ Contractor CERTIFICATIONS: A. '··•·.·····-············· .. ~·., Engine . · .. L'o. 22790 -. .~ J • •. 7'~ ~" ... , ·, :c-.(' a1srf'.Q , .. r . ""· ~ (. . '1 'St ········~~ ..:'" ''\ ONAL --~ B . I, __ '_'~' ertify that the finished floor elevation of the lowest floor, including any basement , of any residential structure, proposed as part of this appl ication is at or above the base flood elevation established in the latest Federal Insurance Administration Flood Hazard Study and maps , as amended . Engineer Date C. I, __ , certify that the alterations or development covered by this permit shall not diminish the flood- carrying capacity of the waterway adjoining or crossing this permitted site and that such alterations or development are consistent with requirements of the City of College Station City Code , Chapter 13 concerning encroachments of floodways and of floodways fringes . Engineer Date D . I , __ , do certify that the proposed alterations do not raise the level of the 100 year flood above elevation established in the latest Federal Insurance Administration Flood Hazard Study. Engineer Date Conditions or comments as part of approval: ------------------------ In accordance with Chapter 13 of the Code of Ordinances of the City of College Station , measures shall be taken to insure that debris from construction , erosion , and sedimentation shall not be deposited in city streets , or existing drainage facilities . All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer for the above named project. All of the applicable codes and ordinances of the City of College Station shall apply. Development Perm it 07/02/03 2 of 2