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23 Development Permit 99-300 ABC Building Dance Studio
Development Permit Issuance Checklist .:· ... "'· c9:2 i. $100 Application Fee 'ifJ'z. Application Complete and Signed / / D 3. Erosion Control Plan (submitted & approved) D 4. EPA N.0.1. submitted for sites > 5 acres IA.A D 5. Drainage Report/Letter (submitted & approved) ~ D 6. $300 Infrastructure Inspection Fee (if applicable) 11tf.. D 7. Easements dedicated (separate instrument) IA~ D 8. TxDOT Permits issued (if applicable) tA/1... D 9. Sealed Engineer's Estimates Received IA (c... O. Development Permit Issued 6) (o, Jq41 "The above checklist must be complete prior to issuing a full development permit on a project. To issue a partial permit for clearing and grading only, items 1-4 must be completed. .Please initial each box if you check off any of these items." DRAINAGE COMPUTATIONS For ABC Pest Control Complex 0.20 Acres College Station, Brazos County, Texas REVISED VERSION Prepared for Mr. Lee Clayton Wood Haven Construction Spring , Texas 77379 Telephone : (281) 798-6118 Prep ared b y : Garrett Engineering 4444 Carter Creek Parkway -Suite 108 Bryan , Texas 77802 ;. - Telephone : (409) 846-2688 RE .. \.ANC coMPL ff\. SE\' o 9 '999 *August, 1999 * coLLEGESTAT\ON ENG,\NG Garrett E"51ineering -4444 Carter Creek Parltway Suite 108 -Bryan, Texas 77802 -Telei:oor>e : (409) 846-2688 -Fax: (409) 846-3094 -Page 1 Engineer's Certification DRAINAGE COMPUTATIONS for ABC Pest Control Complex College Station, Brazos County , Texas *August, 1999 * SUMMARY The subject project is situated on the west side of Southern Plantation Drive and Texas State Highway No .6 west frontage road. The project consist of a total of 0 .63 acres of land which is currently occupied by ABC Pest Control building and associated parking areas, however the proposed area to be approved consists of only 0 .20 acres of land with a parking lot, driveway and a detention facility to negate the impact of development of the proposed drive and parking area. the proposed detention facility will be located at the north comer of the existing ABC Pest Control Building. The metering device will consist of a four inch ( 4 ") diameter orifice constructed in the downstream wall of the detention facility adjacent to Southern Plantation Drive. A two foot (2') wide concrete pilot channel will convey metered storm water discharge from the aforementioned orifice to Southern Plantation Drive. The total area tributary to the proposed detention facility is 0 .20 acres . The existing ABC Pest Control building and parking area drain to the front of the subject property where run-off is metered into an existing ditch that runs parallel to the west frontage road of Texas State Highway No . 6 . The existing detention facility was approved and constructed March , 1998. 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 .30 based on a total tributary drainage basin area of 5 .88 acres of which no development is assumed acres are currently undeveloped (C = 0.30). A 10-minute time of concentration (Tic) was estimated utilizing topographic maps and field reconnaissance. The Rational Method was employed exclusively throughout this document to compute the estimated peak storm water discharge rates. The equation that represents the Rational Method is as follows : Q = CIA, where ; "Q" is the peak discharge rate in cubic feet per second, "C" is the run-off coefficient, assumed to be 0 .30 in the pre-development condition, "I" is the storm intensity in inches per hour, and "A" is the area of the tributary drainage basin in acres . A 30-minute total storm event duration was utilized exclusively throughout this report . From the computations on page 3, based on the total tributary area of 0 .20 acres, the post-development weighted run-off coefficient being assumed at 0.90 , and a minimum time of concentration of 10 minutes, the relative post-development peak discharge rates ("Q") were determined and presented in tabular form . The Rational Method was again utilized to compute the estimated peak post-development discharge rates . Computations depicted on page 3 assume no detention . Pages 14 -16 depict pre-development and post- development hydrographs for the 2, 5 , 10 , 25 , 50 and 100-year storm events with no detentions considered. A comparison between the peak pre-development discharge rates and post-development discharge rates is included to aid in establishing a preliminary "target" for the volume requirements for the proposed detention facility . This preliminary estimate is computed by determining the volume generated from the difference of the pre-development and post-development hydrographs . Please note that the post- development hydrograph shown on these same graphs assumes no detention at this point in the computational process . P -:lO"P 1_1 ------~---------- " Page 4 provides computations that determine the post-development storm water run-off which is allowed to flow from the subject site unmetered and page 5 provides computations that determine the post- development run-off that is routed through the proposed detention facility. The "free-flow" run-off computations presented on page 4 are based on a time of concentration of 10 minutes (minimum), the run- off routed through the proposed detention facility as presented on page 5 is calculated based on a time of concentration of 10 minutes. Pages 6-7 and pages 8-9 are tabulations of the pre-development hydrographs and the post-development hydrographs respectively, based on the computations performed on pages 2 & 3. The post-development hydrograph assumes no detention to facilitate direct comparison in the pre-and post-development conditions. Pages 10-11 and pages 12-13 are tabulations of the post- development hydrograph for "free-flow'' storm water run-off and storm water run-off directed through the detention facility respectively. Having derived the preliminary volume requirements as presented on page 3 and "allowable peak" discharge rate as present on page 2 it is now possible to design the final detention facility and outlet control structure . Page 17 presents a tabulation and depth versus volume graph of the detention facility as proposed The maximwn pond volume necessary to provide sufficient storage for the 100-year storm condition was estimated to be approximately 1257 cubic feet (page 3). The actual design for the proposed detention pond supplies 1365 cubic feet at a water surface elevation of 291.39 (Top Of Detention Pond Retaining Wall). Page 18 presents a tabulation and rating curve for the proposed outlet control structure. A 4" diameter orifice was chosen due to depth verses discharge ratio characteristics associated with the anticipated headwater depth and convenience of construction. Page 19 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. The storage indication curve as shown on page 19 is a graphical solution to the equation presented as follows: 2s 1 (I 1 + I 2) + ( ----------------01 ) dt 2s2 (-----------------+ 02) 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 represents 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), the post-development hydrograph as routed through the detention pond and the post-development "free-flow" hydrograph for each storm event. Pages 38 -43 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 actually been slightly reduced from those peak pre- development discharge rates due to the incorporation of the proposed detention facility. Page 44 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. The construction of the proposed detention facility will minimize the effects of development on downstream property owners and will actually decrease the peak discharge rates for the range of storm events of interest within this report. 'I , I •Determine Total . Pre-Devel.opment Peak Storm Water Discharge Rates Tributary Area ("A"): 0.20 Acres Pervious Area : 0 .20 Acres Impervious Area : o.oo Acres Run-Off Coefficient ("Cwt"): 0.30 Time Of Concentration ("T/c"): Woodlands: Low Elevation : High Elevation : Distance (Feet): Slope(% Grade): Velocity ("Vw"): Time : Pastures : Low Elevation: High Elevation : Distance (Feet): Slope (% Grade): Velocity ("Vp"): Time : Pavements: Low Elevation : High Elevation : Distance (Feet): Slope(% Grade): Velocity ("Vpave"): Time : Total 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: 0.38 5-Year: 0.46 10-Year: 0.52 25-Year: 0.59 50-Year: 0 .67 100-Year: 0.70 c = 0.30 c = 0.90 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 0.00 0.00 0.00 0.00 0.00 Feet I Second 0.00 Minutes 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 Garrett Engneering-4444 Carter Creek Pa11cway Suite 108-Bryan, Te>Ols 77802-Tele~: (409) 846-2688 -Fax: (409) 846-3094 -Page 2 •Determine ·Post-development .Peak Storm Water Discharge (No Detention) Tributary Area ("A "): 0.20 Acres Pervious Area: 0 .00 Acres Impervious Area : 0.20 Acres Run-Off Coefficient ("Cwt"): 0 .90 Time Of Concentration ("T/c"): 10 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 c = 0 .30 c = 0.90 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Peak Discharge Rate ("Q"): 2-Year: 1.14 Cubic Feet I Second 5-Year: 1.38 Cubic Feet I Second 10-Year: 1.55 Cubic Feet I Second 25-Year: 1.78 Cubic Feet I Second 50-Year: 2 .01 Cubic Feet I Second 100-Year: 2 .10 Cubic Feet I Second Comparison Of Predevelopment And Post-development Peak Discharge Rates Predevelopment 2-Year: 0 .38 Ft3/sec 5-Year: 0.46 Ft3/sec 10-Year: 0 .52 Ft3/sec 25-Year: 0 .59 Ft3/sec 50-Year: 0 .67 Ft3/sec 100-Year: 0 .70 Ft3/sec Preliminary Determination Of Detention Pond Volume 2-Year: 0 .76 Ft3/sec x (30 Min . 5-Year: 0 .92 Ft3/sec x (30 Min . 10-Year: 1 .04 Ft3/sec x (30 Min . 25-Year: 1 .18 Ft3/sec x (30 Min. 50-Year: 1 .34 Ft3/sec x (30 Min. 100-Year: 1.40 Ft3/sec x (30 Min . Post-Development 1 .14 Ft3/sec 1.38 Ft3/sec 1 .55 Ft3/sec 1 . 78 Ft3/sec 2.01 Ft3/sec 2.1 O Ft3/sec x 60 Sec. I 2 ) = x 60 Sec. I 2 ) = x 60 Sec. I 2 ) = x 60 Sec. I 2 ) = x 60 Sec. I 2 ) = x 60 Sec. I 2 ) = Increase 0 .76 Ft3/sec 0 .92 Ft3/sec 1.04 Ft3/sec 1 .18 Ft3/sec 1.34 Ft3/sec 1 .40 Ft3/sec 683 Cubic Feet 831 Cubic Feet 933 Cubic Feet 1 ,065 Cubic Feet 1,204 Cubic Feet 1 ,257 Cubic Feet Time B£ise (Tb) = 3 00 x T/c And Time Of Cvnccntraiion (T/ci Of 1 o Minutes Garrett Eogneering • 4444 Carter Creek Parkway Surte 108 • Bryan , Texas 77802 ·Telephone: (409) 846-2888 ·Fax: (409) 846-3094 -Page 3 Determine Post-Development ''Free-Flow" Peak Storm Water Discharge Tributary Area ("A"): 0.00 Acres Pervious Area : 0.00 Acres Impervious Area : 0.00 Acres Run-Off Coefficient ("Cwt"): 0.00 c = 0.30 c = 0.90 Time Of Concentration ("Tic"): 10 Minutes (Min .) Hourly Intensity Rates ("I"): 2-Year: 6 .33 Inches I Hour 5-Year: 7.69 Inches I Hour 10-Year: 8.63 Inches I Hour 25-Year: 9.86 Inches I Hour 50-Year: 11.15 Inches I Hour 100-Year: 11 .64 Inches I Hour Peak Discharge Rate ("Q"): 2-Year: 0 .00 Cubic Feet I Second 5-Year: 0.00 Cubic Feet I Second 10-Year: 0 .00 Cubic Feet I Second 25 -Year: 0.00 Cubic Feet I Second 50-Year: 0.00 Cubic Feet I Second 100-Year: 0.00 Cubic Feet I Second Garrett Engineering-4444 Carter Creek Par1<way Suite 108 -Bryan, Texas 77802 -Telepllone: (409) 846-2688 -Fax: (409) 846-3094 -Page 4 . . --. . Determine Post-Development Flow Into Detention Pond Tributary Area ("A"): 0 .20 Acres Pervious Area: 0 .00 Acres Impervious Area : 0 .20 Acres Run-Off Coefficient ("Cwt"): 0.90 Time Of Concentration ("T/c"): 10 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: 1.14 5-Year: 1.38 10-Year: 1.55 25-Year: 1.78 50-Year: 2 .01 100-Year: 2 .10 c = 0 .30 c = 0.90 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 Parl<way Suite 108 -Bryan, Texas 77802 -Telephone : (409) 846-2688 -Fax: (~) 846-3094 -P•ge 5 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 0.04 0.05 0.05 0.06 0.07 0.07 2 0.08 0.09 0.10 0.12 0.13 0.14 3 0.11 0.14 0.16 0.18 0.20 0.21 4 0.15 0.18 0.21 0.24 0.27 0.28 5 0.19 0.23 0.26 0.30 0.33 0.35 6 0.23 0.28 0.31 0.36 0.40 0.42 7 0.27 0.32 0.36 0.41 0.47 0.49 8 0.30 0.37 0.41 0.47 0.54 0.56 9 0.34 0.42 0.47 0.53 0.60 0.63 10 0.38 0.46 0.52 0.59 0.67 0.70 11 0.36 0.44 0.49 0.56 0.64 0.66 12 0.34 0.42 0.47 0.53 0.60 0.63 13 0.32 0.39 0.44 0.50 0.57 0.59 14 0.30 0.37 0.41 0.47 0.54 0.56 15 0.28 0.35 0.39 0.44 0.50 0.52 16 0.27 0.32 0.36 0.41 0.47 0.49 17 0.25 0.30 0.34 0.38 0.43 0.45 18 0.23 0.28 0.31 0.36 0.40 0.42 19 0.21 0.25 0.28 0.33 0.37 0.38 20 0.19 0.23 0.26 0.30 0.33 0.35 21 0.17 0.21 0.23 0.27 0.30 0.31 22 0.15 0.18 0.21 0.24 0.27 0.28 23 0.13 0.16 0.18 0.21 0.23 0.24 24 0.11 0.14 0.16 0.18 0.20 0.21 25 0.09 0.12 0.13 0.15 0.17 0.17 26 0.08 0.09 0.10 0.12 0.13 0.14 27 0.06 0.07 0.08 0.09 0.10 0.10 28 0.04 0.05 0.05 0.06 0.07 0.07 29 0.02 0.02 0.03 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 En!;jneering-4«4 Corter Creek Pari<way Suite 108-Bryan, Texas 77802-Telephone: (409) 846-2688 -Fax: (409) 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 Engneering-4444 Carter Creek Parl<way Suite 108-Bryan, Texas 77802-Telephone: (409) 846-2688 -Fax: (409) 846-3094 -Page 7 1111 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 0.11 0.14 0.16 0.18 0.20 0.21 2 0.23 0.28 0.31 0.36 0.40 0.42 3 0.34 0.42 0.47 0.53 0.60 0.63 4 0.46 0.55 0.62 0.71 0.80 0.84 5 0.57 0.69 0.78 0.89 1.00 1.05 6 0.68 0.83 0.93 1.07 1.20 1.26 7 0.80 0.97 1.09 1.24 1.40 1.47 8 0.91 1.11 1.24 1.42 1.61 1.68 9 1.02 1.25 1.40 1.60 1.81 1.89 10 1.14 1.38 1.55 1.78 6 2.01 .2.10 ~= 11 1.08 1.32 1.48 1.69 1.91 1.99 12 1.02 1.25 1.40 1.60 1.81 1.89 13 0.97 1.18 1.32 1.51 1.71 1.78 14 0.91 1.11 1.24 1.42 1.61 1.68 15 0.85 1.04 1.17 1.33 1.50 1.57 16 0.80 0.97 1.09 1.24 1.40 1.47 17 0.74 0.90 1.01 1.15 1.30 1.36 18 0.68 0.83 0.93 1.07 1.20 1.26 19 0.63 0.76 0.85 0.98 1.10 1.15 20 0.57 0.69 0.78 0.89 1.00 1.05 21 0.51 0.62 0.70 0.80 0.90 0.94 22 0.46 0.55 0.62 0.71 0.80 0.84 23 0.40 0.48 0.54 0.62 0.70 0.73 24 0.34 0.42 0.47 0.53 0.60 0.63 25 0.28 0.35 0.39 0.44 0.50 0.52 26 0.23 0.28 0.31 0.36 0.40 0.42 27 0.17 0.21 0.23 0.27 0.30 0.31 28 0.11 0.14 0.16 0.18 0.20 0.21 29 0.06 0.07 0.08 0.09 0.10 0.10 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 Ensineering· 4444 Carter Creek Par1<way Suite 108 • Blyan. Texas 7781J2 ·Telephone: (409) 846-2688 ·Fax: (409) 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 Ensjneering-4444 Carter Creel< Parkway Su~e 108 -Bryan, Texas n802 -Telephone: (409) 846-2688 -Fax: (409) 846-3094 -Page 9 • Post-Development "Free-Flow" Inflow Hydrograph Ordinates (Cubic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year SO-Year 100-Year (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.00 0.00 0.00 0.00 0.00 0.00 2 0.00 0.00 0.00 0.00 0.00 0.00 3 0.00 0.00 0.00 0.00 0.00 0.00 4 0.00 0.00 0.00 0.00 0.00 0.00 5 0.00 0.00 0.00 0.00 0.00 0.00 6 0.00 0.00 0.00 0.00 0.00 0.00 7 0.00 0.00 0.00 0.00 0.00 0.00 8 0.00 0.00 0.00 0.00 0.00 0.00 9 0.00 0.00 0.00 0.00 0.00 0.00 10 0.00 0.00 0.00 0.00 0.00 0.00 11 0.00 0.00 0.00 0.00 0.00 0.00 12 0.00 0.00 0.00 0.00 0.00 0.00 13 0.00 0.00 0.00 0.00 0.00 0.00 14 0.00 0.00 0.00 0.00 0.00 0.00 15 0.00 0.00 0.00 0.00 0.00 0.00 16 0.00 0.00 0.00 0.00 0.00 0.00 17 0.00 0.00 0.00 0.00 0.00 0.00 18 0.00 0.00 0.00 0.00 0.00 0.00 19 0.00 0.00 0.00 0.00 0.00 0.00 20 0.00 0.00 0.00 0.00 0.00 0.00 21 0.00 0.00 0.00 0.00 0.00 0.00 22 0.00 0.00 0.00 0.00 0.00 0.00 23 0.00 0.00 0.00 0.00 0.00 0.00 24 0.00 0.00 0.00 0.00 0.00 0.00 25 0.00 0.00 0.00 0.00 0.00 0.00 26 0.00 0.00 0.00 0.00 0.00 0.00 27 0.00 0.00 0.00 0.00 0.00 0.00 28 0.00 0.00 0.00 0.00 0.00 0.00 29 0.00 0.00 0.00 0.00 0.00 0.00 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 Engneering· 4444 Carte< Creek Part<way Suito 108 ·Bryan, ToX>S 77802 • Telephono: (409) 846-2688 ·Fax: (409) 846-3094 • Page 10 - 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 Partcway Suite 108 ·Bryan, Texas 77802 ·Telephone: (409) 846-2688 ·Fu: (409) 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 0.11 0.14 0.16 0.18 0.20 0.21 2 0.23 0.28 0.31 0.36 0.40 0.42 3 0.34 0.42 0.47 0.53 0.60 0.63 4 0.46 0.55 0.62 0.71 0.80 0.84 5 0.57 0.69 0.78 0.89 1.00 1.05 6 0.68 0.83 0.93 1.07 1.20 1.26 7 0.80 0.97 1.09 1.24 1.40 1.47 8 0.91 1.11 1.24 1.42 1.61 1.68 9 1.02 1.25 1.40 1.60 1.81 1.89 10 :d 1.14 1.38 1.55 1.78 2.01 2.10 f 11 1.08 1.32 1.48 1.69 1.91 1.99 12 1.02 1.25 1.40 1.60 1.81 1.89 13 0.97 1.18 1.32 1.51 1.71 1.78 14 0_91 1.11 1.24 1.42 1.61 1.68 15 0.85 1.04 1.17 1.33 1.50 1.57 16 0.80 0.97 1.09 1.24 1.40 1.47 17 0.74 0.90 1.01 1.15 1.30 1.36 18 0.68 0.83 0.93 1.07 1.20 1.26 19 0.63 0.76 0.85 0.98 1.10 1.15 20 0.57 0.69 0.78 0.89 1.00 1.05 21 0.51 0.62 0.70 0.80 0.90 0.94 22 0.46 0.55 0.62 0.71 0.80 0.84 23 0.40 0.48 0.54 0.62 0.70 0.73 24 0.34 0.42 0.47 0.53 0.60 0.63 25 0.28 0.35 0.39 0.44 0.50 0.52 26 0.23 0.28 0.31 0.36 0.40 0.42 27 0.17 0.21 0.23 0.27 0.30 0.31 28 0.11 0.14 0.16 0.18 0.20 0.21 29 0.06 0.07 0.08 0.09 0.10 0.10 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<woy Suite 108-Bryan, TeXlls 77&!2 -Telephone: (409) 84&-2688 -Fax: (409) 84&-3094 -Poge 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 fnlineering· 4444 Carter Creek Parl<way Suite 108-Bryan, Texas 77802-Telephone: (409) 846-2688 ·Fax: (409) 846-3094 -Page 13 ,.. 1.20 .... Q) 1.00 c.. -Q) Q) 0.80 LL u- ·-"C .c c :J 0 0.60 0 u -Q) Q) "' Cl 0 .40 .... cu .c: u (I) 0 .20 i5 0.00 0 .... Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 2-Year Storm Event 10 20 30 40 50 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 ~ 1 .20-----+-+---"0------<------+-----+------1----~ -Q) Q) LL u-:a ~ 0.80------lr----I>------">-+------+-----+------+----~ :J 0 0 u ~ 4> 0 .60 ----+-----i>------+-------+-----+------+----~ Q) "' Cl .... cu .c: u (I) i5 0 10 20 ---Pre -Development Hydrograph 30 40 50 Time (Minutes) ---Post-Development Outflow Hydrograph Without Detention Garrett En!;jneering-4444 Carter Creek Parkway Suite 108 ·Bryan, T.,.,s 77802 • TeleP><>ne : (409) 84S.2Baa -Fax: (409) 84S.3094 -Pa ge 14 60 60 ... Cl) Q. Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 10-Year Storm Event 1 .60 -------.---------r------.------.----~------, 1.40 ----~l----"lr------l------t-----+----------4---------j ~ 1.20----__,,__,___,,,____-+------+-----+------1------1 Cl) u. (.) -1 .00 ----+--t-------1------1-----+-------t------1 :c -g 8 8 0 .80 ---+--t---------'11------t-----+-------t------I -Cl) 8, UJ 0.60 ___ ,,__ __ ,__ ___ -+---""----+-----+------t------1 ... ca ~ 0.40 ----~~,__t--~--=---t-----'~--t-----+-------t------1 en i:5 0.20 ~'---,.C----f------l--=·~-~-+------+----------4---------J 0.00 .c,-. ___ _,. ____ .,._ ___ .-;;::-----e-----1------e 0 10 20 30 40 50 Time (Minutes) ----Pre-Development Hydrograph ---Post-Development Outflow Hydrograph Without Detention 1.80 1.60 ... Cl) Q. -1.40 Cl) Cl) u. 1.20 u-:c -g 1.00 :I 0 0 (.) -Q) 0.80 Q) UJ e> "' .c: (.) en i:5 0.60 0.40 0.20 0 .00 0 Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 25-Year Storm Event Jr\ I \. I \. I \. I '\ I \. I / ........ .........._ \. // ~ ~ \. v/ ............. '-~ 10 20 30 40 50 Time (Minutes) ------· Pre-Development Hydrograph ---Post-Development Outflow Hydrograph Without Detention Gorrell Engineering -44« Corter Creek Po ri<woy Suite 108 ·Bryon, Texas 77802 ·Telephone: (409) 846-2688 -Fox: (409) 846-3094 -Page 15 60 60 ... Q) D.. Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 50-Year Storm Event 0.00 -----------------------------:i 0 10 20 30 40 so Time (Minutes) ----Pre-Development Hydrograph ---Post-Development Outflow Hydrograph Without Detention Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 100-Year Storm Event 60 0.00 -c.-----+----..----...... -----~----ii-----= 0 10 20 Pre-Development Hydrograph 30 40 so Time (Minutes) ---Post-Development Outflow Hydrograph Without Detent ion Garrett Engneering -4444 Cart..-Creek Pa rkway Suite 108 -Bryan, Texas 77802 -Telep.one: (409) 846-2688 -Fax: (409) 846-3094 -Page 16 60 Detention Pond De th Vs. Volume --Cl.I Cl.I u. 1.60 1.40 1.20 1.00 :; 0 .80 -Q. Cl.I c 0 .60 0.40 0.20 0.00 0 Elevation 289 .87 290 .09 290 .89 291 .06 291 .22 291 .39 Depth (Feet) 0 .00 0 .22 1.02 1.19 1.35 1.52 Volume (Ft3) 0 86 715 867 1,064 1 ,365 Detention Pond Depth Vs. Volume 200 400 600 800 1 ,000 Detention Pond Volume (Cubic Feet) 1 ,200 Garrett Engineering · 4«4 Carter Creek Par1<way sute 108 ·Bryan, Texas 77802 ·Telephone : (409) 846-2888 ·Fax: (409) 846-3094 • Page 17 1 ,400 Rating Curve For Outlet Control Structure De th Vs ~ Volume --Cll Cll u. 1.60 1.40 1.20 1.00 :;;-0.80 -Q. Cll c 0.60 0 .40 0.20 0.00 0.00 Elevation 289.87 290 .09 290 .89 291.06 29 1.22 29 1.39 Depth (Feet) 0.00 0 .22 1.02 1.1 9 1.35 1.52 Discharge Ft3/Sec 0 .00 0.07 0 .39 0.43 0 .46 0.50 Rating Curve For Outlet Control Structure Depth Vs. Volume 0.10 0 .20 0.30 0.40 Discharge (Cubic Feet Per Second) Garrett Engneering · 4444 Cart.,. Creek Parkwoy Suite 108 -Bryan, Texas 77802 -Tele~: (409) 846-2688 ·Fax: (409) 84&-3094 -Page 18 0.50 !storage Indication Curve 0 .50 0.45 0 .40 -"C c: 0 .35 0 (,,) Cll CJ) ; 0 .30 Cl. .... Q) Cll IL. (,,) 0 .25 :c :::s 0 -;-0 .20 Cl ... ca .c: (,,) Cll 0 .15 0 0 .10 0 .05 0 .00 Dept h (Feet) 0 .00 0 .22 1.02 1.19 1.35 1.52 0 .00 10 .00 Sto rage Discharge 2s/t 2s/t+O (Ft3) (Ft3/Sec) (Ft3/Sec) (Ft3/Sec) 0 0 .00 0 .00 0 .00 86 0 .07 2 .87 2 .94 715 0 .39 23.83 24 .22 867 0.43 28 .90 29 .33 1,064 0.46 35.47 35 .93 1,365 0 .50 45 .50 46 .00 Storage Indication Curve 20 .00 30 .00 40 .00 2s/t+O (Cub ic Feet Per Second) Garrett Engneering· 4444 Carter Creek Parkway Suite 108-Bryan, Texas 77802-Telephone: (409) 846-2688 -Fax: (409) 846-3094 -Page 19 50 .00 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 0.00 289.87 1 0.11 0.11 0.11 0.11 0.00 0.01 289.88 2 0.23 0.34 0.43 0.45 0.01 0.03 289.90 3 0.34 0.57 0.95 1.00 0.02 0.07 289.94 4 0.46 0.80 1.66 1.75 0.04 0.13 290.00 5 0.57 1.02 2.56 2.69 0.06 0.20 290.07 6 0.68 1.25 3.65 3.81 0.08 0.25 290.12 7 0.80 1.48 4.92 5.13 0.10 0.30 290.17 8 0.91 1.71 6.38 6.63 0.13 0.36 290.23 9 1.02 1.94 8.01 8.31 0.15 0.42 290.29 10 1.14 2.16 9.82 10.18 0.18 0.49 290.36 11 1.08 2.22 11.63 12.04 0.21 0.56 290.43 12 1.02 2.11 13.27 13.73 0.23 0.63 290.50 13 0.97 1.99 14.75 15.26 0.26 0.68 290.55 14 0.91 1.88 16.08 16.63 0.28 0.73 290.60 15 0.85 1.77 17.25 17.84 0.29 0.78 290.65 16 0.80 1.65 18.29 18.91 0.31 0.82 290.69 17 0.74 1.54 19.18 19.82 0.32 0.85 290.72 18 0.68 1.42 19.93 20.60 0.34 0.88 290.75 19 0.63 1.31 20.55 21.24 0.35 0.91 290.78 20 0.57 1.20 21.04 21.74 0.35 0.93 290.80 21 0.51 1.08 21.40 22.12 0.36 0.94 290.81 22 0.46 0.97 21.65 22.37 0.36 0.95 290.82 23 0.40 0.85 21.77 22.50 0.36 0.96 290.83 24 0.34 0.74 21.78 22.51 0.36 0.96 290.83 25 0.28 0.63 21.68 22.41 0.36 0.95 290.82 26 0.23 0.51 21.48 22.20 0.36 0.94 290.81 27 0.17 0.40 21.17 21.88 0.35 0.93 290.80 28 0.11 0.28 20.76 21.45 0.35 0.92 290.79 29 0.06 0.17 20.25 20.93 0.34 0.90 290.77 30 0.00 0.06 19.64 20.30 0.33 0.87 290.74 31 0.00 0.00 19.00 19.64 0.32 0.85 290.72 32 0.00 0.00 18.37 19.00 0.31 0.82 290.69 33 0.00 0.00 17.77 18.37 0.30 0.80 290.67 34 0.00 0.00 17.18 17.77 0.29 0.78 290.65 35 0.00 0.00 16.62 17.18 0.28 0.76 290.63 36 0.00 0.00 16.06 16.62 0.28 0.73 290.60 37 0.00 0.00 15.53 16.06 0.27 0.71 290.58 38 0.00 0.00 15.01 15.53 0.26 0.69 290.56 39 0.00 0.00 14.51 15.01 0.25 0.67 290.54 40 0.00 0.00 14.02 14.51 0.24 0.65 290.52 41 0.00 0.00 13.55 14.02 0.24 0.64 290.51 42 0.00 0.00 13.09 13.55 0.23 0.62 290.49 43 0.00 0.00 12.64 13.09 0.22 0.60 290.47 44 0.00 0.00 12.21 12.64 0.22 0.58 290.45 45 0.00 0.00 11.79 12.21 0.21 0.57 290.44 Garrett Engneering • <<4< Carter Creek Parkway Suite 108 ·Bryan, Texas 77802 ·Telephone: (409) 846-2688 ·Fax: (<09) 846-3094 • Page 20 46 0.00 0.00 11.39 11.79 0.20 0.55 290.42 47 0.00 0.00 10.99 11.39 0.20 0.54 290.41 48 0.00 0.00 10.61 10.99 0.19 0.52 290.39 49 0.00 0.00 10.24 10.61 0.19 0.51 290.38 50 0.00 0.00 9.88 10.24 0.18 0.49 290.36 51 0.00 0.00 9.53 9.88 0.17 0.48 290.35 52 0.00 0.00 9.19 9.53 0.17 0.47 290.34 53 0.00 0.00 8.86 9.19 0.16 0.46 290.33 54 0.00 0.00 8.55 8.86 0.16 0.44 290.31 55 0.00 0.00 8.24 8.55 0.15 0.43 290.30 56 0.00 0.00 7.94 8.24 0.15 0.42 290.29 57 0.00 0.00 7.65 7.94 0.15 0.41 290.28 58 0.00 0.00 7.37 7.65 0.14 0.40 290.27 59 0.00 0.00 7.09 7.37 0.14 0.39 290.26 60 0.00 0.00 6.83 7.09 0.13 0.38 290.25 Garrett En!jneering-4444 Carter Creek Par1<way Suite 108 -Bcyan, Texas 77802-TeleiilOOO: (409) 846-2688 -Fax: (409) 846-3094 -Page 21 "' -"'C c 0 I.) GI en .... GI a.. -GI GI u.. I.) :c ::::J ~ 3: 0 5 ::::J 0 Inflow/Outflow Simulation 2-Year Storm Event 1.20 1.00 0.80 0 .60 J 0.40 0.20 0.00 0 10 ----Pre- Development Hydrograph \ ' l ' ' "\ l \ 20 30 40 Time (Minutes) • Post- Development Outflow Hydrograph Without Detention ---•Post- Development Outflow With Detention 50 - - ---Post- Development "Free-Flow" Garrett Engneering-4444 Carter Creek Parkway Suite 108 -Bryan. Texas 77802 -Telephone : (409 ) 846-2688 -Fax: (409) 846-3094 -Page 22 60 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 0.00 289.87 1 0.14 0.14 0.13 0.14 0.00 0.01 289.88 2 0.28 0.42 0.52 0.55 0.01 0.04 289.91 3 0.42 0.69 1.16 1.21 0.03 0.09 289.96 4 0.55 0.97 2.02 2.12 0.05 0.16 290.03 5 0.69 1.25 3.12 3.27 0.08 0.23 290.10 6 0.83 1.52 4.45 4.64 0.10 0.28 290.15 7 0.97 1.80 6.01 6.25 0.12 0.34 290.21 8 1.11 2.08 7.79 8.09 0.15 0.41 290.28 9 1.25 2.35 9.79 10.15 0.18 0.49 290.36 10 1.38 2.63 12.00 12.42 0.21 0.58 290.45 11 1.32 2.70 14.20 14.70 0.25 0.66 290.53 12 1.25 2.56 16.21 16.77 0.28 0.74 290.61 13 1.18 2.42 18.02 18.63 0.31 0.81 290.68 14 1.11 2.28 19.64 20.31 0.33 0.87 290.74 15 1.04 2.15 21.08 21.79 0.35 0.93 290.80 16 0.97 2.01 22.34 23.09 0.37 0.98 290.85 17 0.90 1.87 23.43 24.21 0.39 1.02 290.89 18 0.83 1.73 24.37 25.17 0.40 1.05 290.92 19 0.76 1.59 25.16 25.96 0.40 1.08 290.95 20 0.69 1.45 25.79 26.61 0.41 1.10 290.97 21 0.62 1.32 26.28 27.11 0.41 1.12 290.99 22 0.55 1.18 26.63 27.46 0.42 1.13 291.00 23 0.48 1.04 26.83 27.67 0.42 1.13 291.00 24 0.42 0.90 26.90 27.73 0.42 1.14 291.01 25 0.35 0.76 26.83 27.66 0.42 1.13 291.00 26 0.28 0.62 26.62 27.45 0.42 1.13 291.00 27 0.21 0.48 26.28 27.10 0.41 1.12 290.99 28 0.14 0.35 25.81 26.62 0.41 1.10 290.97 29 0.07 0.21 25.21 26.01 0.40 1.08 290.95 30 0.00 0.07 24.48 25.28 0.40 1.06 290.93 31 0.00 0.00 23.70 24.48 0.39 1.03 290.90 32 0.00 0.00 22.93 23.70 0.38 1.00 290.87 33 0.00 0.00 22.19 22.93 0.37 0.97 290.84 34 0.00 0.00 21.47 22.19 0.36 0.94 290.81 35 0.00 0.00 20.77 21.47 0.35 0.92 290.79 36 0.00 0.00 20.10 20.77 0.34 0.89 290.76 37 0.00 0.00 19.44 20.10 0.33 0.86 290.73 38 0.00 0.00 18.81 19.44 0.32 0.84 290.71 39 0.00 0.00 18.19 18.81 0.31 0.82 290.69 40 0.00 0.00 17.59 18.19 0.30 0.79 290.66 41 0.00 0.00 17.01 17.59 0.29 0.77 290.64 42 0.00 0.00 16.45 17.01 0.28 0.75 290.62 43 0.00 0.00 15.90 16.45 0.27 0.73 290.60 44 0.00 0.00 15.37 15.90 0.26 0.71 290.58 45 0.00 0.00 14.86 15.37 0.26 0.69 290.56 Garrett Engineering-4444 Carter Creek Parkway Suite 108-Bryan, Texas 77802-Telephone: (409) &46-2688 -Fax: (409) S..6-JOEM -Page 23 "' 46 0.00 0.00 14.36 14.86 0.25 0.67 290.54 47 0.00 0.00 13.87 14.36 0.24 0.65 290.52 48 0.00 0.00 13.41 13.87 0.23 0.63 290.50 49 0.00 0.00 12.95 13.41 0.23 0.61 290.48 50 0.00 0.00 12.51 12.95 0.22 0.60 290.47 51 0.00 0.00 12.08 12.51 0.21 0.58 290.45 52 0.00 0.00 11.67 12.08 0.21 0.56 290.43 53 0.00 0.00 11.26 11.67 0.20 0.55 290.42 54 0.00 0.00 10.87 11.26 0.20 0.53 290.40 55 0.00 0.00 10.50 10.87 0.19 0.52 290.39 56 0.00 0.00 10.13 10.50 0.18 0.50 290.37 57 0.00 0.00 9.77 10.13 0.18 0.49 290.36 58 0.00 0.00 9.43 9.77 0.17 0.48 290.35 59 0.00 0.00 9.09 9.43 0.17 0.46 290.33 60 0.00 0.00 8.77 9.09 0.16 0.45 290.32 Garrett Efllineering-4444 Cartef Creek Pari<way Suite 108 -Bryan, Texas 77802 -Telephone: (409) 846-2688 -Fax: (409) 846-3094 -Page 24 .. 'C c 0 (.) Q) UJ ... Q) a.. -Q) Q) LL (.) :c :I ~ 3: 0 5 :I 0 • Inflow/Outflow Simulation 5-Year Storm Event 1.40 ' \ I \ ' \ 1 .20 \ ' 1 .00 ' \ \ 0 .80 I \ 0 .60 \ ' 0.40 \ \ 0 .20 \' 0 .00 0 10 20 30 40 50 Time (Minutes) --···--··--Pre-• Post- Development Outflow Hydrograph W ithout Detention ----Post- Development Outflow With Detention • --• • -• Post- Development Hydrograph Development "Free-Flow" Ga rrett Engneering-4444 Carter Creek Parlcw3y Suite 108 -Bryan , TeQs 77802 -Telephone : (409) 846-2688 -Fax: (409) 846-3094 -Pa ge 25 60 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 0.00 289.87 1 0.16 0.16 0.15 0.16 0.00 0.01 289.88 2 0.31 0.47 0.58 0.61 0.01 0.05 289.92 3 0.47 0.78 1.30 1.36 0.03 0.10 289.97 4 0.62 1.09 2.27 2.39 0.06 0.18 290.05 5 0.78 1.40 3.51 3.67 0.08 0.25 290.12 6 0.93 1.71 5.01 5.22 0.10 0.31 290.18 7 1.09 2.02 6.77 7.03 0.13 0.37 290.24 8 1.24 2.33 8.77 9.10 0.16 0.45 290.32 9 1.40 2.64 11.02 11.41 0.20 0.54 290.41 10 1.55 2.95 13.50 13.97 0.24 0.63 290.50 11 1.48 3.03 15.98 16.53 0.27 0.73 290.60 12 1.40 2.88 18.24 18.86 0.31 0.82 290.69 13 1.32 2.72 20.28 20.96 0.34 0.90 290.77 14 1.24 2.56 22.10 22.84 0.37 0.97 290.84 15 1.17 2.41 23.73 24.51 0.39 1.03 290.90 16 1.09 2.25 25.17 25.98 0.40 1.08 290.95 17 1.01 2.10 26.44 27.27 0.41 1.12 290.99 18 0.93 1.94 27.54 28.39 0.42 1.16 291.03 19 0.85 1.79 28.47 29.33 0.43 1.19 291.06 20 0.78 1.63 29.23 30.10 0.43 1.21 291.08 21 0.70 1.48 29.84 30.71 0.44 1.22 291.09 22 0.62 1.32 30.28 31.16 0.44 1.23 291.10 23 0.54 1.17 30.57 31.45 0.44 1.24 291.11 24 0.47 1.01 30.70 31.58 0.44 1.24 291.11 25 0.39 0.85 30.67 31.55 0.44 1.24 291.11 26 0.31 0.70 30.49 31.37 0.44 1.24 291.11 27 0.23 0.54 30.16 31.04 0.44 1.23 291.10 28 0.16 0.39 29.68 30.55 0.44 1.22 291.09 29 0.08 0.23 29.05 29.91 0.43 1.20 291.07 30 0.00 0.08 28.27 29.13 0.43 1.18 291.05 31 0.00 0.00 27.43 28.27 0.42 1.15 291.02 32 0.00 0.00 26.60 27.43 0.42 1.13 291.00 33 0.00 0.00 25.78 26.60 0.41 1.10 290.97 34 0.00 0.00 24.97 25.78 0.40 1.07 290.94 35 0.00 0.00 24.18 24.97 0.40 1.04 290.91 36 0.00 0.00 23.40 24.18 0.39 1.02 290.89 37 0.00 0.00 22.65 23.40 0.38 0.99 290.86 38 0.00 0.00 21.92 22.65 0.37 0.96 290.83 39 0.00 0.00 21.20 21.92 0.36 0.93 290.80 40 0.00 0.00 20.52 21.20 0.34 0.91 290.78 41 0.00 0.00 19.85 20.52 0.33 0.88 290.75 42 0.00 0.00 19.20 19.85 0.32 0.86 290.73 43 0.00 0.00 18.57 19.20 0.31 0.83 290.70 44 0.00 0.00 17.96 18.57 0.31 0.81 290.68 Garrett Engneering • #44 Carter Creek Porl<way Suite 108 -Bryan, Texas nB02 -Telephone: ('409) 846-2688 -Fax: ('409) 846-309<4 • Page 26 ,. fill ., 45 0.00 0.00 17.37 17.96 0.30 0.78 290.65 46 0.00 0.00 16.79 17.37 0.29 0.76 290.63 47 o_oo 0.00 16_24 16.79 0.28 0.74 290.61 48 0.00 0.00 15.70 16.24 0.27 0.72 290.59 49 0.00 0.00 15.17 15.70 0.26 0.70 290.57 50 0.00 0.00 14.67 15.17 0.25 0.68 290.55 51 0.00 0.00 14.17 14.67 0.25 0.66 290.53 52 0.00 0.00 13.70 14.17 0.24 0.64 290.51 53 0.00 0.00 13.23 13.70 0.23 0.62 290.49 54 0.00 0.00 12.78 13.23 0.22 0.61 290.48 55 0.00 0.00 12.35 12.78 0.22 0.59 290.46 56 0.00 0.00 11.92 12.35 0.21 0.57 290.44 57 0.00 0.00 11.51 11.92 0.21 0.56 290.43 58 0.00 0.00 11.12 11.51 0.20 0.54 290.41 59 0.00 0.00 10.73 11.12 0.19 0.53 290.40 60 0.00 0.00 10.36 10.73 0.19 0.51 290.38 Garrett Engineering-4444 Carter Creek Parkw11y &ite 108-Bryan, Texas 778'12-Telephone: (409) 846-2888 -Fax: (409) 846-3094 -Page 27 Inflow/Outflow Simulation 10-Year Storm Event -"C c: 0 1.60 1.40 1.20 ~ 1 .00 ti) .... G> a. -G> ,f 0 .80 .!::! .c :J !:!. ~ 0.60 s :J 0 0 .40 0.20 0.00 ' \ ' 0 10 -------Pre- Development Hydrograph \ \ ' ' \ ' \ \ 1 \ 20 \ l \ ' \ \, ' 30 40 Time (Minutes) • Post- Development Outflow Hydrograph Without Detention ----Post- Development Outflow With Detention 50 - - - - -- -Post- Development "Free-Flow'' Garrett Engneering-4444 Carter Cre ek Pa rlcway Suite 108-Bryan, Texas 77802 -Telephone : (409) 846-2688 -Fax: (409) 846-3094 • Pa ge 28 60 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 0.00 289.87 1 0.18 0.18 0.17 0.18 0.00 0.01 289.88 2 0.36 0.53 0.67 0.70 0.02 0.05 289.92 3 0.53 0.89 1.48 1.56 0.04 0.12 289.99 4 0.71 1.24 2.59 2.72 0.06 0.20 290.07 5 0.89 1.60 4.01 4.19 0.09 0.27 290.14 6 1.07 1.95 5.74 5.97 0.12 0.33 290.20 7 1.24 2.31 7.75 8.04 0.15 0.41 290.28 8 1.42 2.66 10.05 10.41 0.18 0.50 290.37 9 1.60 3.02 12.62 13.07 0.22 0.60 290.47 10 1.78 3.37 15.46 15.99 0.27 0.71 290.58 11 1.69 3.46 18.30 18.92 0.31 0.82 290.69 12 1.60 3.28 20.88 21.59 0.35 0.92 290.79 13 1.51 3.11 23.22 23.99 0.39 1.01 290.88 14 1.42 2.93 25.34 26.15 0.41 1.08 290.95 15 1.33 2.75 27.25 28.09 0.42 1.15 291.02 16 1.24 2.57 28.96 29.82 0.43 1.20 291.07 17 1.15 2.40 30.47 31.35 0.44 1.24 291.11 18 1.07 2.22 31.80 32.69 0.45 1.27 291.14 19 0.98 2.04 32.94 33.84 0.45 1.30 291.17 20 0.89 1.86 33.90 34.81 0.45 1.32 291.19 21 0.80 1.69 34.67 35.58 0.46 1.34 291.21 22 0.71 1.51 35.25 36.18 0.46 1.35 291.22 23 0.62 1.33 35.66 36.58 0.46 1.36 291.23 24 0.53 1.15 35.89 36.81 0.46 1.36 291.23 25 0.44 0.98 35.94 36.86 0.46 1.37 291.24 26 0.36 0.80 35.81 36.73 0.46 1.36 291.23 27 0.27 0.62 35.50 36.43 0.46 1.36 291.23 28 0.18 0.44 35.03 35.95 0.46 1.35 291.22 29 0.09 0.27 34.38 35.29 0.46 1.33 291.20 30 0.00 0.09 33.56 34.47 0.45 1.31 291.18 31 0.00 0.00 32.66 33.56 0.45 1.29 291.16 32 0.00 0.00 31.77 32.66 0.45 1.27 291.14 33 0.00 0.00 30.89 31.77 0.44 1.25 291.12 34 0.00 0.00 30.02 30.89 0.44 1.23 291.10 35 0.00 0.00 29.15 30.02 0.43 1.21 291.08 36 0.00 0.00 28.29 29.15 0.43 1.18 291.05 37 0.00 0.00 27.45 28.29 0.42 1.16 291.03 38 0.00 0.00 26.62 27.45 0.42 1.13 291.00 39 0.00 0.00 25.80 26.62 0.41 1.10 290.97 40 0.00 0.00 25.00 25.80 0.40 1.07 290.94 41 0.00 0.00 24.21 25.00 0.40 1.05 290.92 42 0.00 0.00 23.43 24.21 0.39 1.02 290.89 43 0.00 0.00 22.67 23.43 0.38 0.99 290.86 44 0.00 0.00 21.94 22.67 0.37 0.96 290.83 45 0.00 0.00 21.23 21.94 0.36 0.93 290.80 Garrett Engineering-«44 Carter Creek Parkway SUie 108 -Btyan, Texas 77802 -Telephone: (409) 846-2688 -Fax: (409) 846-3094 -Page 29 • 46 0.00 0.00 20.54 21.23 0.34 0.91 290.78 47 0.00 0.00 19.87 20.54 0.33 0.88 290.75 48 0.00 0.00 19.22 19.87 0.32 0.86 290.73 49 0.00 0.00 18.59 19.22 0.31 0.83 290.70 50 0.00 0.00 17.98 18.59 0.31 0.81 290.68 51 0.00 0.00 17.38 17.98 0.30 0.79 290.66 52 0.00 0.00 16.81 17.38 0.29 0.76 290.63 53 0.00 0.00 16.25 16.81 0.28 0.74 290.61 54 0.00 0.00 15.71 16.25 0.27 0.72 290.59 55 0.00 0.00 15.19 15.71 0.26 0.70 290.57 56 0.00 0.00 14.68 15.19 0.25 0.68 290.55 57 0.00 0.00 14.19 14.68 0.25 0.66 290.53 58 0.00 0.00 13.71 14.19 0.24 0.64 290.51 59 0.00 0.00 13.25 13.71 0.23 0.62 290.49 60 0.00 0.00 12.80 13.25 0.22 0.61 290.48 Garrett Engineering-4444 Carter Creek Par1<way SUite 108 -Bryan, Texas 77802 -Telephone: (409) 846-2688 -Fax: (409) 846-3094 -Page 30 ... Inflow/Outflow Simulation 25-Year Storm Event 1.80 1.60 1.40 --g 1 .20 0 u Q) en .. cu a. 1 .00 4i Q) LL u .g 0 .80 0 -3: 0 5 c5 0 .60 0.40 0.20 0 .00 I 1 0 10 ----Pre- Development Hydrograph \ \ \ 20 30 40 50 Time (Minutes) • Post- Development Outflow Hydrograph Without Detention ----Post -• • • - --• Post- Development Development Outflow W ith "Free-Flow'' Detention Garrett Engneering -4444 Carter Creek Parl<way Suite 108 -Bryan, 'rexas 77802 -Tele~: (409) 846-2638 -Fax: (409) 846-3094 -Page 31 60 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 0.00 289.87 1 0.20 0.20 0.19 0.20 0.00 0.02 289.89 2 0.40 0.60 0.76 0.79 0.02 0.06 289.93 3 0.60 1.00 1.67 1.76 0.04 0.13 290.00 4 0.80 1.40 2.94 3.08 0.07 0.23 290.10 5 1.00 1.81 4.55 4.74 0.10 0.29 290.16 6 1.20 2.21 6.50 6.75 0.13 0.36 290.23 7 1.40 2.61 8.78 9.11 0.16 0.45 290.32 8 1.61 3.01 11.39 11.79 0.20 0.55 290.42 9 1.81 3.41 14.30 14.80 0.25 0.67 290.54 10 2.01 3.81 17.52 18.11 0.30 0.79 290.66 11 1.91 3.91 20.73 21.43 0.35 0.91 290.78 12 1.81 3.71 23.66 24.45 0.39 1.03 290.90 13 1.71 3.51 26.35 27.17 0.41 1.12 290.99 14 1.61 3.31 28.80 29.66 0.43 1.20 291.07 15 1.50 3.11 31.02 31.91 0.44 1.25 291.12 16 1.40 2.91 33.03 33.93 0.45 1.30 291.17 17 1.30 2.71 34.82 35.74 0.46 1.35 291.22 18 1.20 2.51 36.40 37.33 0.47 1.37 291.24 19 1.10 2.31 37.76 38.70 0.47 1.40 291.27 20 1.00 2.11 38.92 39.87 0.48 1.42 291.29 21 0.90 1.91 39.87 40.82 0.48 1.43 291.30 22 0.80 1.71 40.61 41.57 0.48 1.45 291.32 23 0.70 1.50 41.14 42.11 0.48 1.45 291.32 24 0.60 1.30 41.47 42.45 0.49 1.46 291.33 25 0.50 1.10 41.61 42.58 0.49 1.46 291.33 26 0.40 0.90 41.54 42.51 0.49 1.46 291.33 27 0.30 0.70 41.27 42.24 0.49 1.46 291.33 28 0.20 0.50 40.80 41.77 0.48 1.45 291.32 29 0.10 0.30 40.14 41.10 0.48 1.44 291.31 30 0.00 0.10 39.29 40.24 0.48 1.42 291.29 31 0.00 0.00 38.34 39.29 0.47 1.41 291.28 32 0.00 0.00 37.40 38.34 0.47 1.39 291.26 33 0.00 0.00 36.47 37.40 0.47 1.37 291.24 34 0.00 0.00 35.55 36.47 0.46 1.36 291.23 35 0.00 0.00 34.63 35.55 0.46 1.34 291.21 36 0.00 0.00 33.72 34.63 0.45 1.32 291.19 37 0.00 0.00 32.82 33.72 0.45 1.30 291.17 38 0.00 0.00 31.93 32.82 0.45 1.27 291.14 39 0.00 0.00 31.05 31.93 0.44 1.25 291.12 40 0.00 0.00 30.17 31.05 0.44 1.23 291.10 41 0.00 0.00 29.30 30.17 0.43 1.21 291.08 42 0.00 0.00 28.44 29.30 0.43 1.19 291.06 43 0.00 0.00 27.60 28.44 0.42 1.16 291.03 44 0.00 0.00 26.77 27.60 0.42 1.13 291.00 45 0.00 0.00 25.95 26.77 0.41 1.10 290.97 Garrett Engineering-4444 Carter Creek Par1<way SUite 108 -Bryan, TeXlls 77802 -Teiopllone: (409) 846-2688 -Fax: (409) 846-3094 -Page 32 46 0.00 0.00 25.14 25.95 0.40 1.08 290.95 47 0.00 0.00 24.34 25.14 0.40 1.05 290.92 48 0.00 0.00 23.56 24.34 0.39 1.02 290.89 49 0.00 0.00 22.80 23.56 0.38 1.00 290.87 50 0.00 0.00 22.07 22.80 0.37 0.97 290.84 51 0.00 0.00 21.35 22.07 0.36 0.94 290.81 52 0.00 0.00 20.66 21.35 0.35 0.91 290.78 53 0.00 0.00 19.98 20.66 0.34 0.89 290.76 54 0.00 0.00 19.33 19.98 0.33 0.86 290.73 55 0.00 0.00 18.70 19.33 0.32 0.84 290.71 56 0.00 0.00 18.08 18.70 0.31 0.81 290.68 57 0.00 0.00 17.49 18.08 0.30 0.79 290.66 58 0.00 0.00 16.91 17.49 0.29 0.77 290.64 59 0.00 0.00 16.35 16.91 0.28 0.75 290.62 60 0.00 0.00 15.81 16.35 0.27 0.72 290.59 Garrett Engineering-4444 Cart"' Creek Parkway S<ite 108 -Bryan, Texas 77802 • Teiojlllone: (409) 841S-~ -Fax: (40Q) 841S-3094 -Page 33 - Inflow/Outflow Simulation 50-Year Storm Event 2.50 2 .00 ' I \ I ' ' -'t:J J ~ c 0 I ' t.) I ' QI "' 1 .50 \ .... ' QI I a.. ... \ QI QI ' u. t.) • :c :I I 0 i' 1.00 0 5 :I 0 0 .50 0.00 0 10 ---,-Pre- Development Hydrograph \ \ 20 30 40 50 Time (Minutes) • Post- Deve lopment Outflow Hydrograph Without Detent ion ----Post-- - ----• Post- Development Development Outflow W ith "Free-Flow" Detention Garrett Engneeting • 4444 Carter Creek Parl<way SIJite 108 • Bryan. Texas nao2 ·Telephone: (409) 84&-2688 • Fax: (409) 84&-3094 • Pa ge 3-4 60 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 0.00 289.87 1 0.21 0.21 0.20 0.21 0.00 0.02 289.89 2 0.42 0.63 0.79 0.83 0.02 0.06 289.93 3 0.63 1.05 1.75 1.84 0.04 0.14 290.01 4 0.84 1.47 3.07 3.22 0.07 0.23 290.10 5 1.05 1.89 4.75 4.95 0.10 0.30 290.17 6 1.26 2.30 6.79 7.06 0.13 0.37 290.24 7 1.47 2.72 9.18 9.52 0.17 0.47 290.34 8 1.68 3.14 11.90 12.32 0.21 0.57 290.44 9 1.89 3.56 14.94 15.46 0.26 0.69 290.56 10 2.10 3.98 18.30 18.92 0.31 0.82 290.69 11 1.99 4.09 21.66 22.39 0.36 0.95 290.82 12 1.89 3.88 24.74 25.54 0.40 1.06 290.93 13 1.78 3.67 27.56 28.41 0.42 1.16 291.03 14 1.68 3.46 30.14 31.02 0.44 1.23 291.10 15 1.57 3.25 32.49 33.39 0.45 1.29 291.16 16 1.47 3.04 34.61 35.53 0.46 1.34 291.21 17 1.36 2.83 36.51 37.44 0.47 1.38 291.25 18 1.26 2.62 38.18 39.13 0.47 1.40 291.27 19 1.15 2.41 39.64 40.59 0.48 1.43 291.30 20 1.05 2.20 40.87 41.84 0.48 1.45 291.32 21 0.94 1.99 41.88 42.86 0.49 1.47 291.34 22 0.84 1.78 42.68 43.66 0.49 1.48 291.35 23 0.73 1.57 43.27 44.25 0.49 1.49 291.36 24 0.63 1.36 43.64 44.63 0.49 1.50 291.37 25 0.52 1.15 43.80 44.79 0.50 1.50 291.37 26 0.42 0.94 43.76 44.75 0.50 1.50 291.37 27 0.31 0.73 43.50 44.49 0.49 1.49 291.36 28 0.21 0.52 43.04 44.02 0.49 1.49 291.36 29 0.10 0.31 42.38 43.35 0.49 1.48 291.35 30 0.00 0.10 41.51 42.48 0.49 1.46 291.33 31 0.00 0.00 40.54 41.51 0.48 1.44 291.31 32 0.00 0.00 39.59 40.54 0.48 1.43 291.30 33 0.00 0.00 38.64 39.59 0.47 1.41 291.28 34 0.00 0.00 37.70 38.64 0.47 1.40 291.27 35 0.00 0.00 36.76 37.70 0.47 1.38 291.25 36 0.00 0.00 35.84 36.76 0.46 1.36 291.23 37 0.00 0.00 34.92 35.84 0.46 1.35 291.22 38 0.00 0.00 34.01 34.92 0.46 1.33 291.20 39 0.00 0.00 33.10 34.01 0.45 1.30 291.17 40 0.00 0.00 32.21 33.10 0.45 1.28 291.15 41 0.00 0.00 31.32 32.21 0.44 1.26 291.13 42 0.00 0.00 30.44 31.32 0.44 1.24 291.11 43 0.00 0.00 29.57 30.44 0.44 1.22 291.09 44 0.00 0.00 28.71 29.57 0.43 1.20 291.07 45 0.00 0.00 27.86 28.71 0.43 1.17 291.04 Garrett Engnoering· 4444 Cartet Creek Parl<way Suite 108· Bryan, Tens 77802-Telepllone: (409) 846-2688 ·Fax: (409) 846-3094 -Page 35 - - 46 0.00 0.00 27.02 27.86 0.42 1.14 291.01 47 0.00 0.00 26.20 27.02 0.41 1.11 290.98 48 0.00 0.00 25.39 26.20 0.41 1.09 290.96 49 0.00 0.00 24.59 25.39 0.40 1.06 290.93 50 0.00 0.00 23.81 24.59 0.39 1.03 290.90 51 0.00 0.00 23.04 23.81 0.38 1.00 290.87 52 0.00 0.00 22 .. 29 23.04 0.37 0.98 290.85 53 0.00 0.00 21.57 22.29 0.36 0.95 290.82 54 0.00 0.00 20.87 21.57 0.35 0.92 290.79 55 0.00 0.00 20.19 20.87 0.34 0.89 290.76 56 0.00 0.00 19.53 20.19 0.33 0.87 290.74 57 0.00 0.00 18.89 19.53 0.32 0.84 290.71 58 0.00 0.00 18.27 18.89 0.31 0.82 290.69 59 0.00 0.00 17.67 18.27 0.30 0.80 290.67 60 0.00 0.00 17.09 17.67 0.29 0.77 290.64 Garrett Er9neering-««Carter Creek Parlcqy SUite 108 -Bryan, Texas nao2 -Tetei:none: (409) 8ol6-2688 -Fax: (409) 8ol6-3094 -Page 36 - -'O c 0 u 41 "' ~ 41 Q. ... 41 41 u. u :c ::::J 0 2.50 2.00 1 .50 • Inflow/Outflow Simulation 100-Year Storm Event \ \ \ ' • l ' i 1 .00 \ 0 5 ::::J 0 0 .50 0 .00 0 10 -----Pre- Development Hydrograph \ \ 20 \ "'-.'' ' 30 40 50 Time (Minutes) • Post- Development Outflow Hydrograph Without Detention ----Post-------· Post- Development Development Outflow With "Free-Flow" Detention GarMI Engineering -4-444 Carter Creek Parl<way SLite 108 -Bryan. Texas 77802 -TeieP>one: (409) 846-2eaa -Fu: (409) 846-3094 -Page 37 60 Inflow/Outflow Simulation 2-Year Storm Event 0 .40 0 .35 0 .30 ' ( 1 -I "C I c I 0 0 .25 (.) GI f (/) I ... I GI ll. I ... GI GI 0 .20 LL l (,) :c I :I ~ 3: I 0 0.15 = I :I 0 0 .10 0 .05 \ \ \ 0 .00 0 10 20 30 40 50 60 Time (Minutes) ---Pre-Developme nt Hydrograph ---Total Post-D evelopment Hydrograph Garrett E1'9neering -+44<4 Carter Creek Part<way &Ate 108-Bryan, Texas 77802 -Telephone: (409) 846-2688 -Fax: (409) 846-3094 -Pago 38 Inflow/Outflow Simulation 5-Year Storm Event 0 .50 0.45 0.40 0.35 -'t:I c: 0 u Q) 0 .30 "' ... Q) ll. .. Q) Q) 0.25 I.I.. u ii :J 0 -~ 0 .20 I 5 1 :J I 0 ! f 0 .15 I ! I • 0.10 0 .05 0 .00 0 10 20 30 40 50 60 Time (Minutes) ---Pre-Development Hydrograph ---Total Post-Development Hydrograph Gamilt Engneering • 4-444 Carter Creek Par1<way Suite 108 -Bryan, Te>o1s 77802 -Telephone: (409) 846-2688 -Fax: (409) 846-~ -Page 39 - - 0 .60 0 .50 ;;-0.40 c 0 u cu en .... cu Q. -t u. 0 .30 u :s :I ~ 3: 0 = :::I 0 0 .20 0 .10 0.00 Inflow/Outflow Simulation 10-Year Storm Event \ I \ \ \ 0 10 20 30 40 50 60 Time (Minutes) ---Pre-Development Hydrograp h ---Total Post-Development Hydrog raph Garrett E19neering • 4444 Carter Cnoek Parkway Suite 108 • Bryan , Texas 77802 • Teiel:hOne : (409) &46-2888 • Fax: (409) 846-3094 • Page 40 - 0 .60 0.50 ~ 0.40 c 0 u Q) C/J .... Q) 0.. -Q) Q) u. 0 .30 u :.c ::s 0 -?: 0 5 ::s 0 0 .20 0 .10 0 .00 0 I / I I i I Inflow/Outflow Simulation 25-Year Storm Event I I \ \ \ \ 10 20 30 40 50 Time (Minutes) ---Pre-Development Hydrograph ---Total Post-Development Hydrograp h Garrett En9neering-«« Ca~erCrffk ~arl<way Suite 108-Bryon, T.,..s 77602-Telephone: (409) 646-2688 -Fax: (<!09) 646-3094 -Pogo 41 60 Inflow/Outflow Simulation 50-Year Storm Event 0 .70 0 .60 I 0 .50 -i:s i c 0 I u Cl> f "' ... 0 .40 Cl> a. ..... Cl> Cl> u.. I u 1 :c ~ I 2. 0.30 ~ I 0 I 5 ~ 0 \ I \ 0.20 I \ I \ \ \ \ 0.10 \ \ \ ' 0 .00 0 10 20 30 40 50 60 Time (Minutes) ---Pre-Development Hydrograph ---Total Post-Development Hydrograph G a~ Engineering-4444 Carter Creek Part<way Suite 108 -Bryan , Texas 77802 -Telephone : (409) 846-2688 -Fax: (409) 846-3094 -Page 42 - Inflow/Outflow Simulation 100-Year Storm Event 0.70 0 .60 i i ! 0 .50 I ' :s I c I 0 u GI I "' ... 0 .40 GI D.. -GI GI u. u :0 ~ ~ 0.30 ~ 0 = ~ 0 0 .20 0 .10 \ \ 0 .00 0 10 20 30 40 50 60 Time (Minutes) ---·-----Pre-Development Hydrograph ---Total Post-Development Hydrograp h Garrett Engneering-4+44 Carter Creek Par!<way Suite 108 -Bryan. Texas 77802-Telephone: (409) 84&-25118 -Fax: (409) 84&-3094 -Page 43 - Detention Pond Storage Volumes as Percent of Maximum Volume 100% 90% 80% 70% Q) E :::I 0 60% > E :::I E ')( 50% ca ~ .... 0 ... 40% c: Q) (.) ... Q) Q. 30% 20% 10% 0% 2-year 5-year 10-year 25-year Storm Depth Storm Elevat ion Storm Volume Maximum Capacity Percent of Capacity Design Storm Storm Simulation Synopsis 2-ear 5-ear 10-ear 25-ear 0.96 1.14 1.24 1.37 290 .83 291 .01 29 1.11 291 .24 664 807 934 1092 1365 1365 1365 1365 49% 59% 68% 80% 50-year 100 -year 93% 97% Gorrell Engineering -4444 Carter Creek Parl<way &ite 108 • Bryan, Texas 77802 -Telephone: (409) 846-2688 -Fax: (409) 846-3094 -Page 44 DEVELOPMENT PERMIT CITY OF COLLEGE STATION 1101 TEXAS AVE COLLEGE STATION, TX 77840 PHONE: (409) 76 4-3741 FAX: (409) 764 -3814 Application Number Property Address Property ID . . . . Application description Subdivision Name Property Use Property Zoning . Owner JENKINS, ROBERT W JR 9519 IH 35 NORTH AUSTIN TX 78753 99-00500300 Date 9/09/99 4202 SH 6 S A 569500-0000 -0021 DEVELOPMENT-AREA'S INSIDE SFHA SHENANDOAH #1 BUSINESS GENERAL COMMERCIAL Contractor OWNER DEVELOPMENT PERMIT 100.00 Permit . . . . Additional desc Permit Fee Issue Date 9/09/99 Valuation Special Notes and Comments 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. 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. ANY TREES REQUIRED TO BE PROTECTED BY ORDINANCE OR AS PART OF THE LANDSCAPE PLAN MUST BE COMPLETELY FENCED BEFORE ANY OPERATIONS OF THIS PERMIT CAN BEGIN. 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 0 DEVELOPMENT PERMIT CITY OF COLLEGE STATION 1101 TEXAS AVE COLLEGE STATION, TX 77840 PHONE: (409) 764 -3741 FAX: (409) 764-3814 Application Number 99-00500300 Special Notes and Comments. CONSTRUCTION, EROSION AND SEDIMENTATION SHALL NOT BE DEPOSITED IN CITY STREETS, OR EXISTING DRAINAGE FACILITIES. I HEREBY GRANT THIS PERMIT FOR DEVELOPMENT OR AN AREA INSIDE THE SPECIAL FLOOD HAZAR D AREA. ALL DEVELOPMENT SHALL BE IN ACCORDANCE WITH THE PLANS AND SPECIFICATIONS SUBMITTED TO AND APPROVED BY THE CITY DEVELOPMENT ENGINEER AND ALL OF THE CODES AND ORDINANCES OF THE CITY OF COLLEGE STATION THAT APPLY. ADMINISTRATOR SIGNITURE: DATE: CONTRACTOR/OWNER SIGNITURE: DATE: **************************************** **************************************** Fee summary Charged Paid ------------------------------------- Permit Fee Total 100.00 100.00 Grand Total 100.00 100.00 BUILDING DEPT APPLICANT: Credited ---------- .00 .00 Page Date Due 2 9/09/99 ---------- .00 .00 / FOR OFFICE USE ONL y CASE NO. DATE SUBMfITED ____ _ SITE PLAN APPLICATION MINIMUM SUBMITTAL REQUIREMENTS _ Site plan application completed in full. $100 .00 Application Fee . 1---....-::r SlOO.OO Development Pennit Application Fee . _ $300 .00 Public Infrastructure Inspection Fee if applicable . (This fee is payable if construction of a public waterline, sewerline, sidewalk, street or drainage facilities is involved .) _ Ten ( l 0) folded copies of site plan. _ A copy of the attached site plan checklist with all items checked off or a brief explanation as to why they are not ch ecked off. APPLICATION DAT A NAME OF PROJECT f/jJ C 8u1 ld) /;t/G ADDRESS ~ 0 J.-~ 22 uvrl ft_w l t LEGAL oEscRIPTioN t-0 r J ) JJ7;:: % " St0 6 /Vtb? /.)~O~r'f~H-'---__.#:,__/ ___ _ APPLICANT (Primary Contact for the Project): Name Lee c/~~~ street Ad~~ascr J i~t::;-Ylfl7D/f../ LA.aif-city ~'-*f__..&'---'-1--<-;, __ 5 ____ _ State n Zip Code ] ).] ) 5 E-Mail Address ----------- Phone Number d-&'/ -7c;~-&l/k Fax.Number >f:/-.]7 0-I Vo:J PROPER1Y OWNER'S INFORMATION: -----. Name /]1Jf)e7 v bn ;(I r?S Street Address f;YO d:: _{' tJ //Of ~ State ,a Zip Code 7 / y rf..J f City Ct?t./Lft5e ST)f17v',,v E-Mail Address - Phone Number )--)(=) -" 3 t, I -OJ OV Fax Number---------------- ARCIBTECT OR ENGlNEER'S INJORMATION: . Name_ (.d /fl--l67/ brJ<j1,,, &~YI~ Street Address c/:f f St-<!Mt-bR_ (k~/< ff "-7 City Jl,.e-.>q.7~lf=i;.i::=:i~---- State ti Zip Code E-Mail Address ___________ _ Phon e Nfunber c:foa., ~']l, _ 'd=G. it Fax Number ?/fl, -30 9+-V-------- OTIIER CONT ACTS (Please specify type of contact, i .e . project manager, potential buyer, local contact, etc.) Name ;qdn '21 /b t!C&Tn A 7 --, 1/ Street Address cfro~ d S l>v pt /!h-=; & City Lp ,, """' 5 L S Df-Ve'A-- State Tl ZipCode 71~<f..J E-MailAddress ------------- Phone Number 'i/trJ -'3(,(-vSe.Q_Fax.Number _______________ _ SITE PLAN AP PUCA TION SITEAPP.DOC OJn5/99 I ofJ CURRENT ZONING __ C_-_/f-/ _ ___;h~.s--!5-o....- !RESENT USE OF PROPERlY /Z/ /A PROPOSED USE OF PROPERlY V ARIANCE(S) REQUESTED AND REASON(S) # OF PARKING SPACES REQUIRED __ ;}-_C)~ Si 0 MULTI-FAMILY RESIDENTIAL Total Acreage ---- Floodplain Acreage -- Housing Units ---- # of 1 Bedroom Units #of 2 Bedroom Units # of 3 Bedroom Units # of 4 Bedroom Units FOR 2 BEDROOM UNITS ONLY __ # Bedrooms ~ 132 sq. ft. __ # Bedrooms < 132 sq . ft. SITE Pl.AN APPLICATION SITEAPP .DOC OJn~/99 I #OF PARKING SPACES PROVIDED ]/ 0 COMMERCIAL Total Acreage , J- Building Square Feet .}--) f']l Floodplain Acreage ---- Date ~ I 2 of3 SUPPLEMENTAL DEVELOPMENT PERMIT INFORMATION Application is hereby made for the following development specific waterway alterations : 17' 771 II I ACKNOWLEDGMENTS: I, ----------------·' design engineer/owner, hereby acknowledge or affirm that The information and conclusions contained in the above plans and supporting documents comply with the current requirements of the City of College Station, Texas City Code, Chapter 13 and its associated Drainage Policy and Design Standards. As a condition of approval of this permit application, I agree to construct the improvements proposed in this application accordi ng to these documents and the requirements of Chapter l3 of the College Station City Code. Property Owner(s) Contracto r CERTIFICATIONS: (for proposed alterations within designated flood hazard areas .) A. I, , certify that any nonresidential structure on or p roposed to be on this site as part of this ap plication is designated to prevent damage to th e structure or its con tents as a result of fl oodi ng from the 100 yea r sto rm. Engineer Date B . I, certify that the finished floor elevation of the lowest floor, including any basement, of any residential structure, proposed as part of this application is at or above the base flood elevation established in the latest Federal Insurance Administration Flood Haz.ard 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 flood way 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 Administratio n Flood Hazard Study . Engineer Date Conditions or comments as part of approval:----------------------------- In accordance with Chapter l3 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. All development shall be in accordance with the plans and specifications submitted to and approved by the City Engineer for the above named proj ect All of the applicable codes and ordinances of the City of Co ll ege Station shall apply. SITE PLAN APPLICATION SITEAPP.OOC OJn5/99 3 ofJ