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Home My WebLink AboutFolderCk~,~~ ~* ()~ CITY OF COLLEGE STATION ~ Planning & Development Services FINAL PLAT APPLICATION (Check one) 0 Minor ($300.00) 0 Amending ($300.00) ~ Final ($400.00) D Vacating ($400.00) D Replat ($600.00)" *Includes public hearing fee The following items must be submitted by an established filing deadline date for P&Z Commission consideration. MINIMUM SUBMITTAL REQUIREMENTS: _../_Filing Fee (see above) NOTE: Multiple Sheets -$55.00 per additional sheet NIA Variance Request to Subdivision Regulations -$100 (if applicable) _..)_ Development Permit Appllcation Fee of $200.00 (if applicable). _../_ Infrastructure Inspection Fee of $600.00 (applicable if any public infrastructure is being constructed) __{_ Application completed in full. NIA Copy of original deed restrictions/covenants for replats {if applicable). _{_ Thirteen (13) folded copies of plat. (A signed mylar original must be submitted after staff review.) N/A One (1) copy of the approved Preliminary Plat and/or one (1) Master Plan (if applicable). __ Paid tax certificates from City of College Station, Brazos County and College Station l.S.D. _../_ A copy of the attached chec~list with all items checked off or a brief explanation as to why they are not. _:::=.._ Two (2) copies of public infrastructure plans associated with this plat (if applicable). ll.1..8. Parkland Dedication requirement approved by the Parks & Recreation Board, please provide proof of approval {if applicable). Date of Preapplication Conference:_~N_c_i-J_· £'--------------------- NAME OF SUBDIVISION ~S~u~p~er~·~·s~"~P~h~a~s~e~"~--------------------- SPECIFIED LOCATION OF PROPOSED SUBDIVISION (Lot & Block) Approximately 245 feet along the northwest right-of-way of SH 30,in a southwest direction from the intersecton of FM 158, Elmo Weeden & SH 30. APPLICANT/PROJECT MANAGER'S INFORMATION (Primary Contact for the Project): Name Garrett Engineering -DeAnna Ordonez Street Address 4444 Cartercreek Parkway Suite 108 City Brvan State Tx Zip Code 77802 E-Mail Address ddgar@txcyber.com Phone Number of 979.846.2688 cell 979.739.1649 Fax Number_9_79~-~8_4~6_-3_0_4~9 ________ _ PROPERTY OWNER'S INFORMATION: Name Sanh Trinh Street Address P.O. Box 4650 State __ ___,_T=x-Zip Code 7_,_7'--'8"""'0"--"5'----- Phone Number -=-97-'-9,,_--=5_,_7 5=--_,4-=5-'-45=-------- ARCHITECT OR ENGINEER'S INFORMATION: City Brvan E-Mail Address sanhtrinh@verizonmail.com Fax Number 979-774-2998 SUPPLEMENTAL DEVELOPMENT PERMIT INFORMATION App\ication is hereby made for the following deve\opment specific sitefwatefWay a\terations·. ~ l='l.At-J.S . ACKNOWLEDGMENTS: I, Sanh Trinh , 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 according to th documents and the requirements of Chapt r 1 f the llege Station City Code. Subject property is not in a 100 year flood plain. 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. DRAINAGE COMPUTATIONS for Brazos Super Trac Phase I & II College Station, Brazos County, Texas *Jan., 2007 * SUMMARY Super "B" Phase I, 1.21 acres, is currently developed as an Exxon Gas Station and is located southwest of the intersection of FM 158 and State Hwy 30. Super "B" Phase II a 1.88 acre tract is currently undeveloped. The 1.88 acre tract is located directly south of Phase I, approximently 245 feet south of the intersection of FM 158 and State Hwy 30 on the west side of the right-of-way of Harvey Road (SH 30). Both tracts together are all of that 3.09 acre tract of land conveyed to Brazos Super Trac, Inc. in vol. 3644, pg. 256, deed recorded in Brazos County Deed Records. Said 3.09 acre tract being in the J.W. SCOTT SURVEY, A-49, and MARIA KEGANS SURVEY, A-28, College Station, Brazos County, Texas. Currently the stormwater run-off from the 1.21 acre d itigated through a ? detention pond constructed on the adjacent acre proper 1 acre development surfaced drained into a grated junction x, through a 18" di r-RC pipe then on to surface l> drain into the detention pond. The mitig ted storm wa er-run-off leaving the detention pond is then dispersed or "fanned-out" to 64 feet 1me it reaches the nighboring property. See Topographic Survey. Detention ponds are typically designed to release the post developed run-off at a rate that is equal to the run-off rate in the predeveloped condition. Assuming this is the case, the run-off rates for the 1.21 acre tract in the predeveloped state was calculated for the 2, 5, 10, 25, 50 and 100-year storm events as 3.06 ft3 /s, 3.72 ft3 /s, 4.18 ft3 / s, 4.77 ft3/s, 5.40 ft3/s, and 5.63 ft3 /s, respectfully. These are the run-off rates that are being "fanned-out" over 64 feet as previously mentioned. It is proposed to relocate the Phase I detention pond to the west property line of the 1.88 acre tract. A storm water detention facility was designed to accept run-off from the total 3.01 acre tract and 0.1 acre of a joint access easement tributary that passes through the proposed 2.50 acre site development. The total tributary of water flowing through the 2.50 acre development site is 4.20 acres. The 2.50 acre development site has 0.00 acres that are allowed to "free flow". 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 0.35. The post development weighted run-off coefficient was assumed to be 0.43 for the 5.11 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 0.00 acres and having a weighted run-off coefficient of 0.00. 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 6.20 minutes. The calculations fort/care on Page 1 and Appendix A shows the slopes and distances taken to compute t/ c as well as the tributary areas. 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 318.00. In the 25-year strom event the elevation in the pond is 317 .08 thus leaving 0.92 foot 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 3.5 is available due to the physical geometry of the pond. The pipe diameter of 18 inches was selected. This value was determined from the following equation for headwater depth (in feet), H=[[ (2.5204 (1 +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 2.50 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. 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. 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 The construction of the proposed detention facility will minimize the effects of this development on the downstream property owners and will actually decrease the peak discharge rates for the range of storm events of interest within this report. 3 Determine Total Pre-Developm Peak Storm Water Disc Tributary Area ("A"): 0.826 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 0.40 0.826 0.000 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: 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: 2.09 5-Year: 2.54 10-Year: 2.85 25-Year: 3.26 50-Year: 3.68 100-Year: 3.84 Page 1 c = 0.40 c = 0.97 0.00 0.00 0.00 0.00 0.00 Feet I Second 0.00 Minutes 309.25 318.00 512.00 1.71 1.42 Feet I Second 5.99 Minutes 0.00 0.00 0.00 0.00 0.00 Feet I Second 0.00 Minutes 5.99 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 Determine Post-development Peak Storm Water Discharge (No Detention) Tributary Area ("A"): 0.826 Pervious Area: Impervious Area: Run-Off Coefficient ("Cwt"): Acres 0.85 0 .175 0.651 Acres Acres c = 0.40 c = 0.97 Time Of Concentration ("T le"): 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-Yea r: Comparison Of Predevelopment And Post-development Peak Discharge Rates 2-Year: 5-Year: 10-Year: 25-Year: 50-Year: 100-Year: Predevelopment 2.09 Ft31sec 2.54 Ft31sec 2.85 Ft31sec 3.26 Ft31sec 3.68 Ft31sec 3.84 Ft31sec Preliminary Determination Of Detention Pond Volume 2-Year: 2.35 Ft31sec x (30 Min. 5-Year: 2.86 Ft31sec x (30 Min. 10-Year: 3.20 Ft31sec x (30 Min. 25-Year: 3.66 Ft31sec x (30 Min. 50-Year: 4.14 Ft31sec x (30 Min. 100-Year: 4.32 Ft31sec x (30 Min. x 60 x 60 x 60 x 60 x 60 x 60 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 4.44 Cubic Feet I Second 5.40 Cubic Feet I Second 6.06 Cubic Feet I Second 6.92 Cubic Feet I Second 7.82 Cubic Feet I Second 8.17 Cubic Feet I Second Post-Development Increase Sec. Sec. Sec. Sec. Sec. Sec. I I I 4.44 Ft31sec 5.40 Ft31sec 6.06 Ft31sec 6.92 Ft31sec 7 .82 Ft31sec 8.17 Ft31sec 2 )= 2 )= 2 )= I 2 ) = I 2 )= I 2 )= 2.35 Ft31sec 2.86 Ft31sec 3.20 Ft31sec 3.66 Ft31sec 4.14 Ft31sec 4.32 Ft31sec 2,113 Cubic 2,570 Cubic 2,884 Cubic 3,294 Cubic 3,724 Cubic 3,888 Cubic Time Base (Tb)= 3.00 x T le And Time Of Concentration (T le) Of 10 Minutes. Page 2 Feet Feet Feet Feet Feet Feet Determine Post-Development "Free-Flow" Peak Storm Water Discharge Tributary Area ("A"): 0.000 Pervious Area : Impervious Area : Run·Off Coefficient ("Cwt"): Acres 0.00 0.000 0.000 Acres Acres Time Of Concentration ("T /c"): 10.00 Minutes (Min.) Hourly Intensity Rates ("I "): 2·Year: 6.33 5·Year: 7.69 lO·Year: 8.63 25-Year: 9.86 50-Year: 11.15 100-Year: 11.64 Peak Discharge Rate ("Q"): 2-Year: 0.00 5-Year: 0.00 10-Year: 0.00 25-Year: 0.00 50-Year: 0.00 100-Year: 0.00 Page 3 c = 0.40 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 Determine Post-Development Flow Into Detention Pond Tributary Area ("A"): 0.826 Pervious Area : Impervious Area: Run -Off Coefficient ("Cwt"): Time Of Concentration ("T /c"): Hourly Intensity Rates ("I"): Peak Discharge Rate ("Q"): Acres 0.85 0.175 0.651 Acres Acres 10.00 Minutes 2-Year: 5-Yea r: 10-Year: 25-Year: 50-Year: 100-Year: 10-Year: 25-Year: 50-Year: 100-Year: 6.33 7.69 8.63 9.86 11.15 11.64 4.44 5.40 6.06 6.92 7.82 8.17 Page 4 c = 0.40 c = 0.97 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 Pre-Development Inflow Hydrograph Ordinates (Cub ic Feet per Second) Time 2-Year 5-Year 10-Year 25-Year 50-Year 100-Yea r (Minutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.21 0.25 0.29 0.33 0.37 0.38 2 0.42 0.51 0.57 0.65 0.74 0.77 3 0.63 0.76 0.86 0.98 1.10 1.15 4 0.84 1.02 1.14 1.30 1.47 1.54 5 1.04 1.27 1.43 1.63 1.84 1.92 6 1.25 1.52 1.71 1.95 2.21 2.31 7 1.46 1.78 2.00 2.28 2.58 2.69 8 1.67 2.03 2.28 2.61 2.95 3.08 9 1.88 2.29 2.57 2.93 3.31 3.46 11 1.99 2.41 2.71 3.09 3.50 3.65 12 1.88 2.29 2.57 2.93 3.31 3.46 13 1.78 2.16 2.42 2.77 3.13 3.27 14 1.67 2.03 2.28 2.61 2.95 3.08 15 1.57 1.91 2.14 2.44 2.76 2.88 16 1.46 1.78 2.00 2 .28 2.58 2.69 17 1.36 1.65 1.85 2.12 2.39 2.50 18 1.25 1.52 1.71 1.95 2.21 2.31 19 1.15 1.40 1.57 1.79 2.03 2.11 20 1.04 1.27 1.43 1.63 1.84 1.92 21 0.94 1.14 1.28 1.47 1.66 1.73 22 0.84 1.02 1.14 1.30 1.47 1.54 23 0.73 0.89 1.00 1.14 1.29 1.35 24 0.63 0.76 0.86 0 .98 1.10 1.15 25 0.52 0.64 0.71 0 .81 0.92 0.96 26 0.42 0.51 0.57 0.65 0.74 0.77 27 0.31 0.38 0.43 0.49 0.55 0.58 28 0.21 0.25 0.29 0.33 0.37 0.38 29 0.10 0.13 0.14 0 .16 0.18 0.19 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 Page 5 (j) (Jl (Jl (Jl (Jl (Jl (Jl (Jl (Jl (Jl (Jl .p. .p. .p. .p. 0 \.D (X) -..J (j) (Jl .p. w I\.) ...., 0 \.D (X) -..J (j) 999009999999999 000000000000000 000000000000000 999099999090990 000000000000000 000000000000000 000099909909090 000000000000000 000000000000000 009090900000009 000000000000000 000000000000000 099000999099909 000000000000000 000000000000000 009000000090000 000000000000000 000000000000000 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 0.44 0.54 0.61 0.69 0.78 0.82 2 0.89 1.08 1.21 1.38 1.56 1.63 3 1.33 1.62 1.82 2.08 2.35 2.45 4 1.78 2.16 2.42 2.77 3.13 3.27 5 2.22 2.70 3.03 3.46 3.91 4.08 6 2.66 3.24 3.63 4.15 4.69 4.90 7 3.11 3.78 4.24 4.84 5.47 5.72 8 3.55 4.32 4.85 5.53 6.26 6.53 9 3.99 4.86 5.45 6.23 7.04 7.35 11 4.22 5.13 5.75 6.57 7.43 7.76 12 3.99 4.86 5.45 6.23 7.04 7.35 13 3.77 4.59 5.15 5.88 6.65 6.94 14 3.55 4.32 4.85 5.53 6.26 6.53 15 3.33 4.05 4.54 5.19 5.87 6.12 16 3.11 3.78 4.24 4.84 5.47 5.72 17 2.88 3.51 3.94 4.50 5.08 5.31 18 2.66 3.24 3.63 4.15 4.69 4.90 19 2.44 2.97 3.33 3.80 4.30 4.49 20 2.22 2.70 3.03 3.46 3.91 4.08 21 2.00 2.43 2.73 3.11 3.52 3.67 22 1.78 2.16 2.42 2.77 3.13 3.27 23 1.55 1.89 2.12 2.42 2.74 2.86 24 1.33 1.62 1.82 2.08 2.35 2.45 25 1.11 1.35 1.51 1.73 1.96 2.04 26 0.89 1.08 1.21 1.38 1.56 1.63 27 0.67 0.81 0.91 1.04 1.17 1.22 28 0.44 0.54 0.61 0.69 0.78 0.82 29 0.22 0.27 0.30 0.35 0.39 0.41 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 Page 7 O'IU1UlU1UlU1UlU1UlU1Ul~~~~ 0 l.O 00 -....! 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O'I ppppppppppppppp 000000000000000 000000000000000 ppppppppppppppp 000000000000000 000000000000000 ooooooopppppppp 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 PPPPPPPPPPPPPPP 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 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 0.00 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 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 Page 9 ""'O Ill OQ ct> ..... 0 O'\U1U1UlU1U1UlU1UlU1Ul~~~~ 0 \.D 00 -....J (j\ 01 ~ w I\) ..... 0 \.D 00 -....J (j\ PPPPPPPPPPPPPPP 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 PPPPPPPPPPPPPPP 000000000000000 000000000000000 PPPPPPPPPPPPPPP 000000000000000 000000000000000 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 (Mi nutes) Storm Storm Storm Storm Storm Storm 0 0.00 0.00 0.00 0.00 0.00 0.00 1 0.44 0.54 0.61 0.69 0.78 0.82 2 0.89 1.08 1.21 1.38 1.56 1.63 3 1.33 1.62 1.82 2.08 2.35 2.45 4 1.78 2.16 2.42 2.77 3.13 3.27 5 2.22 2.70 3.03 3.46 3.91 4.08 6 2.66 3.24 3.63 4.15 4.69 4.90 7 3.11 3.78 4.24 4.84 5.47 5.72 8 3.55 4.32 4.85 5.53 6.26 6.53 9 3.99 4.86 5.45 6.23 7.04 7.35 11 4.22 5.13 5.75 6.57 7.43 7.76 12 3.99 4.86 5.45 6.23 7.04 7.35 13 3.77 4.59 5.15 5.88 6.65 6.94 14 3.55 4.32 4.85 5.53 6.26 6.53 15 3.33 4.05 4.54 5.19 5.87 6.12 16 3.11 3.78 4.24 4.84 5.47 5.72 17 2.88 3.51 3.94 4.50 5.08 5.31 18 2.66 3.24 3.63 4.15 4.69 4.90 19 2.44 2.97 3.33 3.80 4.30 4.49 20 2.22 2.70 3.03 3.46 3.91 4.08 21 2.00 2.43 2.73 3.11 3.52 3.67 22 1.78 2.16 2.42 2.77 3.13 3.27 23 1.55 1.89 2.12 2.42 2.74 2.86 24 1.33 1.62 1.82 2.08 2.35 2.45 25 1.11 1.35 1.51 1.73 1.96 2.04 26 0.89 1.08 1.21 1.38 1.56 1.63 27 0.67 0.81 0.91 1.04 1.17 1.22 28 0.44 0.54 0.61 0.69 0.78 0.82 29 0.22 0.27 0.30 0.35 0.39 0.41 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 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 Page 12 -"'C c 0 u Cl) IJ) ... Cl) ll. -Cl) Cl) La. u .c ::i Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 2-Year Storm Event 5.00 -"'C 4.50 c 0 u 4.00 Cl) IJ) ... 3.50 Cl) ll. -3.00 Cl) Cl) La. 2.50 u :c 2.00 ::i 0 ';' 1.50 t)O ... 1.00 "' ..c u j\ I \. I ~ I \. I ' " I / ~ \. // ~ \. // ~~ Ill c 0.50 (/ 0.00 0 ~ 10 20 30 40 50 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 6.00 5.00 4.00 3.00 ~ 2.00 Cl) t)O ... 70 "' ~ 1.00--,_,~~-+-~~~-+--~--__,1--~~~+-~~~-1-~~~-+--~~~---< Ill c 0 10 20 30 40 50 60 70 Time (Minutes) -Pre-Development Hydrograph -Post-Development Outflow Hydrograph Without Detention Page 13 -"C c 0 (,) Q) CJ) -Q) ll.. -Q) Q) LI. (,) ~ :J (.) -Q) -"C Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 10-Year Storm Event g 6.00-----------+-----+-------+-----+-------+--------< (,) Q) CJ) -5.oo------1'-+-~--+------+-------+-----+-------+-------j Q) ll.. -~ 4.oo----.,.._--+--~-+------+-------+-----+-------+-------j LI. (,) ~ 3.oo----11----+-----------+-------+-----+-------+--------< (.) -~ 2.00 __ __,_ _ _,_--+-------+-------+-------+-----+-------+--------< -ro .J: :il 1.00 __,f---/-----+----+--_,,,_,_---' __ -+-------+-----+-------+-------j c 8.00 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 ro . .J: (,) "' 1.00 c 0.00 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Post-Development Outflow Hydrograph Without Detention Page 14 -"O c 0 u Cll V) ... Cll Q. -Cll Cll Y.. u .c ::l Tota l Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 50-Year Storm Event 9.00 8 .00 7.00 6.00 5.00 4.00 Ji\. I ' I ~ I ' ~ 3.00 I I ~ \ // ~ ~ Cll t).Q ... 2.00 ra .: u Ill 1.00 0 // ~~' {/ ~ 0.00 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 100-Year Storm Event 9.00 -"O 8.00 c 0 u Cll 7.00 V) ... Cll 6.00 Q. -Cll 5.00 Cll Y.. u 4.00 :.c ::l ~ 3.00 Cll t).Q ~ 2.00 .: u 1.00 Ill 0 0.00 I ' I ' I ' I \ I / ~ ' // ~ ' // ~' {/ ~ 0 10 20 30 40 50 60 Time (Minutes) --Pre-Development Hydrograph -Post-Development Outflow Hydrograph Without Detention Page 15 70 70 3.50 3.00 2.50 Z" 2.00 Q) Q) ..... -.: -Q. Q) Q 1.50 1.00 0.50 0.00 Elevation 310.00 312.50 312.70 312.80 312.90 313.00 Depth (Feet) 0.00 2.50 2.70 2.80 2.90 3.00 Detention Pond Depth Vs. Volume / -------- I J I Volume (Ft3) 0 1614 1993 2475 3316 4536 I I J I 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 Detention Pond Volume (Cubic Feet) Page 16 Rating Curve For Outlet Control Structure De th Vs. Volume Elevation 310.00 312.50 312.70 312.80 312.90 313.00 Depth (Feet) 0.00 2.50 2.70 2.80 2.90 3.00 Pipe Dia. 18.00 (in.) 3.00 (Length In Feet) Discharge Ft3/Sec 0.00 1.90 2.10 2.35 2.50 2.65 Rating Curve For Outlet Control Structure Depth Vs. Volume :-2.00+-~~~~-+-~~~~-+-~~~~------.w~~~~-+~~~~--j~~~~~ cu cu Y.. -.c -c. cu 0 1.50--~~~~-l-~~~~-+------..~~~~--l-~~~~-+~~~~--+~~~~--1 0.00~--------..... ---------+----------+---------+----------t----------t 0.00 0.50 1.00 1.50 2.00 2.50 3.00 Discharge (Cubic Feet Per Second) 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 2.50 1,614 1.90 53.82 55.72 2.70 1,993 2.10 66.45 68.55 2.80 2,475 2.35 82.50 84.85 2.90 3,316 2.50 110.53 113.03 3.00 4,536 2.65 151.19 153.84 Storage Indication Curve -"ti c 2.00 Q u Q) en ... Q) ll.. -Q) Q) La. 1.50 u :a ;:, 0 -Q) bO ... "' ..c u 1.00 Ill Ci 0.00~~~ ..... ~~--1~~~+-~~_.,~~~1--~~ ..... ~~-+~~~+-~~-1 0.00 20.00 40.00 60.00 80.00 100.00 120.00 140.00 160.00 180.00 2s/t+O (Cubic Feet Per Second) Page 18 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 0.00 310.00 1 0.44 0.44 0.41 0.44 0.02 0.02 310.02 2 0.89 1.33 1.63 1.74 0.06 0.08 310.08 3 1.33 2.22 3.58 3.85 0.13 0.17 310.17 4 1.78 3.11 6.23 6.69 0.23 0.30 310.30 5 2.22 3.99 9.53 10.23 0.35 0.46 310.46 6 2.66 4.88 13.43 14.41 0.49 0.65 310.65 7 3.11 5.77 17.89 19.20 0.65 0.86 310.86 8 3.55 6.66 22.87 24.55 0.84 1.10 311.10 9 3.99 7.54 28.34 30.42 1.04 1.36 311.36 10 4.44 8.43 34.27 36.78 1.25 1.65 311.65 11 4.22 8.65 39.99 42.92 1.46 1.93 311.93 12 3.99 8.21 44.92 48.20 1.64 2.16 312.16 13 3.77 7.77 49.09 52.68 1.80 2.36 312.36 14 3.55 7.32 52.59 56.41 1.91 2.51 312.51 15 3.33 6.88 55.55 59.47 1.96 2.56 312.56 16 3.11 6.44 57.99 61.99 2.00 2.60 312.60 17 2.88 5.99 59.93 63.98 2.03 2.63 312.63 18 2.66 5.55 61.37 65.47 2.05 2.65 312.65 19 2.44 5.10 62.34 66.47 2.07 2.67 312.67 20 2.22 4.66 62.85 67.00 2.08 2.68 312.68 21 2.00 4.22 62.91 67.06 2.08 2.68 312.68 22 1.78 3.77 62.54 66.68 2.07 2.67 312.67 23 1.55 3.33 61.75 65.87 2.06 2.66 312.66 24 1.33 2.88 60.56 64.64 2.04 2.64 312.64 25 1.11 2.44 58.97 63.00 2.01 2.61 312.61 26 0.89 2.00 57.01 60.97 1.98 2.58 312.58 27 0.67 1.55 54.67 58.56 1.94 2.54 312.54 28 0.44 1.11 51.98 55.78 1.90 2.50 312.50 29 0.22 0.67 49.05 52.64 1.80 2.36 312.36 30 0.00 0.22 45.92 49.28 1.68 2.21 312.21 31 0.00 0.00 42.78 45.92 1.57 2.06 312.06 32 0.00 0.00 39.87 42.78 1.46 1.92 311.92 33 0.00 0.00 37.15 39.87 1.36 1.79 311.79 34 0.00 0.00 34.61 37.15 1.27 1.67 311.67 35 0.00 0.00 32.25 34.61 1.18 1.55 311.55 36 0.00 0.00 30.05 32.25 1.10 1.45 311.45 37 0.00 0.00 28.00 30.05 1.02 1.35 311.35 38 0.00 0.00 26.09 28.00 0.95 1.26 311.26 39 0.00 0.00 24.31 26.09 0.89 1.17 311.17 40 0.00 0.00 22.66 24.31 0.83 1.09 311.09 41 0.00 0.00 21.11 22.66 0.77 1.02 311.02 42 0.00 0.00 19.67 21.11 0.72 0.95 310.95 43 0.00 0.00 18.33 19.67 0.67 0.88 310.88 44 0.00 0.00 17.08 18.33 0.63 0.82 310.82 45 0.00 0.00 15.91 17.08 0.58 0.77 310.77 Page 19 46 0.00 0.00 14.83 15.91 0.54 0.71 310.71 47 0.00 0.00 13.82 14.83 0.51 0.67 310.67 48 0.00 0.00 12.88 13.82 0.47 0.62 310.62 49 0.00 0.00 12.00 12.88 0.44 0.58 310.58 50 0.00 0.00 11.18 12.00 0.41 0.54 310.54 51 0.00 0.00 10.42 11.18 0.38 0.50 310.50 52 0.00 0.00 9.71 10.42 0.36 0.47 310.47 53 0.00 0.00 9.04 9.71 0.33 0.44 310.44 54 0.00 0.00 8.43 9.04 0.31 0.41 310.41 55 0.00 0.00 7.85 8.43 0.29 0.38 310.38 56 0.00 0.00 7.32 7.85 0.27 0.35 310.35 57 0.00 0.00 6.82 7.32 0.25 0.33 310.33 58 0.00 0.00 6.35 6.82 0.23 0.31 310.31 59 0.00 0.00 5.92 6.35 0.22 0.29 310.29 60 0.00 0.00 5.52 5.92 0.20 0.27 310.27 Page 20 Inflow/Outflow Simulation 2-Year Storm Event 4.50 •' I \ I ' 4.00 \ 3.50 I \ \ -' "O c I \ 0 u 3.00 G> en \ ... G> D.. -I \ G> G> 2.50 ..... u \ :c ' ::s (,) I -~ 0 2.00 :;: -::s 0 1.50 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-Development 'Free-Flow' Page 21 Inflow I Outflow Simulation 5-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 0.00 310.00 0.54 0.54 0.50 0.54 0.02 0.02 310.02 2 1.08 1.62 1.98 2.12 0.07 0.10 310.10 3 1.62 2.70 4.36 4.68 0.16 0.21 310.21 4 2.16 3.78 7.58 8.13 0.28 0.36 310.36 5 2.70 4.86 11.59 12.44 0.42 0.56 310.56 6 3.24 5.94 16.33 17.52 0.60 0.79 310.79 7 3.78 7.02 21.75 23.34 0.80 1.05 311.05 8 4.32 8.09 27.81 29.85 1.02 1.34 311.34 9 4.86 9.17 34.46 36.99 1.26 1.66 311.66 10 5.40 10.25 41.67 44.72 1.52 2.01 312.01 11 5.13 10.52 48.63 52.19 1.78 2.34 312.34 12 4.86 9.98 54.72 58.61 1.95 2.55 312.55 13 4.59 9.44 60.11 64.17 2.03 2.63 312.63 14 4.32 8.90 64.80 69.01 2.11 2.70 312.70 15 4.05 8.36 68.82 73.16 2.17 2.73 312.73 16 3.78 7.83 72.20 76.64 2.22 2.75 312.75 17 3.51 7.29 74.95 79.48 2.27 2.77 312.77 18 3.24 6.75 77.09 81.69 2.30 2.78 312.78 19 2.97 6.21 78.64 83.29 2.33 2.79 312.79 20 2.70 5.67 79.63 84.31 2.34 2.80 312.80 21 2.43 5.13 80.05 84.75 2.35 2.80 312.80 22 2.16 4.59 79.95 84.64 2.35 2.80 312.80 23 1.89 4.05 79.32 84.00 2.34 2.79 312.79 24 1.62 3.51 78.19 82.83 2.32 2.79 312.79 25 1.35 2.97 76.57 81.16 2.29 2.78 312.78 26 1.08 2.43 74.48 79.00 2.26 2.76 312.76 27 0.81 1.89 71.93 76.37 2.22 2.75 312.75 28 0.54 1.35 68.93 73.28 2.17 2.73 312.73 29 0.27 0.81 65.51 69.74 2.12 2.71 312.71 30 0.00 0.27 61.66 65.78 2.06 2.66 312.66 31 0.00 0.00 57.68 61.66 1.99 2.59 312.59 32 0.00 0.00 53.82 57.68 1.93 2.53 312.53 33 0.00 0.00 50.15 53.82 1.84 2.41 312.41 34 0.00 0.00 46.73 50.15 1.71 2.25 312.25 35 0.00 0.00 43.54 46.73 1.59 2.10 312.10 36 0.00 0.00 40.57 43.54 1.48 1.95 311.95 37 0.00 0.00 37.80 40.57 1.38 1.82 311.82 38 0.00 0.00 35.22 37.80 1.29 1.70 311.70 39 0.00 0.00 32.82 35.22 1.20 1.58 311.58 40 0.00 0.00 30.58 32.82 1.12 1.47 311.47 41 0.00 0.00 28.50 30.58 1.04 1.37 311.37 42 0.00 0.00 26.55 28.50 0.97 1.28 311.28 43 0.00 0.00 24.74 26.55 0.91 1.19 311.19 44 0.00 0.00 23.06 24.74 0.84 1.11 311.11 45 0.00 0.00 21.48 23.06 0.79 1.03 311.03 Page 22 46 0.00 0.00 20.02 21.48 0.73 0.96 310.96 47 0.00 0.00 18.65 20.02 0.68 0.90 310.90 48 0.00 0.00 17.38 18.65 0.64 0.84 310.84 49 0.00 0.00 16.20 17.38 0.59 0.78 310.78 50 0.00 0.00 15.09 16.20 0.55 0.73 310.73 51 0.00 0.00 14.06 15.09 0.51 0.68 310.68 52 0.00 0.00 13.10 14.06 0.48 0.63 310.63 53 0.00 0.00 12.21 13.10 0.45 0.59 310.59 54 0.00 0.00 11.38 12.21 0.42 0.55 310.55 55 0.00 0.00 10.60 11.38 0.39 0.51 310.51 56 0.00 0.00 9.88 10.60 0.36 0.48 310.48 57 0.00 0.00 9.20 9.88 0.34 0.44 310.44 58 0.00 0.00 8.58 9.20 0.31 0.41 310.41 59 0.00 0.00 7.99 8.58 0.29 0.38 310.38 60 0.00 0.00 7.45 7.99 0.27 0.36 310.36 Page 23 Inflow/Outflow Simulation 5-Year Storm Event I' I \ 5.00 I \ \ I \ 4.00 \ -"C I \ c 0 u Cll \ IJ) ... Cll ll. -I \ Cll Cll 3.00 ..... u ..Q ' :::s I (.) -~ 0 :;: -:::s 0 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-Development 'Free-Flow' Page 24 Inflow I Outflow Simulation 10-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 0.00 310.00 1 0.61 0.61 0.56 0.61 0.02 0.03 310.03 2 1.21 1.82 2.22 2.38 0.08 0.11 310.11 3 1.82 3.03 4.89 5.25 0.18 0.24 310.24 4 2.42 4.24 8.51 9.13 0.31 0.41 310.41 5 3.03 5.45 13.01 13.96 0.48 0.63 310.63 6 3.63 6.66 18.33 19.67 0.67 0.88 310.88 7 4.24 7.87 24.42 26.20 0.89 1.18 311.18 8 4.85 9.09 31.22 33.50 1.14 1.50 311.50 9 5.45 10.30 38.68 41.51 1.42 1.86 311.86 10 6.06 11.51 46.77 50.19 1.71 2.25 312.25 11 5.75 11.81 54.69 58.58 1.94 2.54 312.54 12 5.45 11.21 61.78 65.90 2.06 2.66 312.66 13 5.15 10.60 68.06 72.38 2.16 2.72 312.72 14 4.85 9.99 73.56 78.06 2.25 2.76 312.76 15 4.54 9.39 78.31 82.95 2.32 2.79 312.79 16 4.24 8.78 82.37 87.09 2.36 2.81 312.81 17 3.94 8.18 85.79 90.55 2.38 2.82 312.82 18 3.63 7.57 88.57 93.36 2.40 2.83 312.83 19 3.33 6.97 90.72 95.53 2.41 2.84 312.84 20 3.03 6.36 92.25 97.08 2.42 2.84 312.84 21 2.73 5.75 93.16 98.00 2.42 2.85 312.85 22 2.42 5.15 93.47 98.31 2.42 2.85 312.85 23 2.12 4.54 93.17 98.01 2.42 2.85 312.85 24 1.82 3.94 92.28 97.11 2.42 2.84 312.84 25 1.51 3.33 90.80 95.61 2.41 2.84 312.84 26 1.21 2.73 88.73 93.52 2.40 2.83 312.83 27 0.91 2.12 86.09 90.85 2.38 2.82 312.82 28 0.61 1.51 82.87 87.60 2.36 2.81 312.81 29 0.30 0.91 79.11 83.78 2.33 2.79 312.79 30 0.00 0.30 74.88 79.42 2.27 2.77 312.77 31 0.00 0.00 70.49 74.88 2.20 2.74 312.74 32 0.00 0.00 66.23 70.49 2.13 2.71 312.71 33 0.00 0.00 62.10 66.23 2.06 2.66 312.66 34 0.00 0.00 58.10 62.10 2.00 2.60 312.60 35 0.00 0.00 54.23 58.10 1.94 2.54 312.54 36 0.00 0.00 50.53 54.23 1.85 2.43 312.43 37 0.00 0.00 47.08 50.53 1.72 2.27 312.27 38 0.00 0.00 43.87 47.08 1.61 2.11 312.11 39 0.00 0.00 40.88 43.87 1.50 1.97 311.97 40 0.00 0.00 38.09 40.88 1.39 1.83 311.83 41 0.00 0.00 35.49 38.09 1.30 1.71 311.71 42 0.00 0.00 33.07 35.49 1.21 1.59 311.59 43 0.00 0.00 30.82 33.07 1.13 1.48 311.48 44 0.00 0.00 28.72 30.82 1.05 1.38 311.38 Page 25 45 0.00 0.00 26.76 28.72 0.98 1.29 311 .29 46 0.00 0.00 24.93 26.76 0.91 1.20 311 .20 47 0.00 0.00 23.23 24.93 0.85 1.12 311 .12 48 0.00 0.00 21.65 23.23 0.79 1.04 311.04 49 0.00 0.00 20.17 21 .65 0.74 0.97 310.97 50 0.00 0.00 18.79 20.17 0.69 0.91 310.91 51 0.00 0.00 17.51 18.79 0.64 0.84 310.84 52 0.00 0.00 16.32 17.51 0.60 0.79 310.79 53 0.00 0.00 15.21 16.32 0.56 0.73 310.73 54 0.00 0.00 14.17 15.21 0.52 0.68 310.68 55 0.00 0.00 13.20 14.17 0.48 0.64 310.64 56 0.00 0.00 12.30 13.20 0.45 0.59 310.59 57 0.00 0.00 11 .46 12.30 0.42 0.55 310.55 58 0.00 0.00 10.68 11.46 0.39 0.51 310.51 59 0.00 0.00 9.95 10.68 0.36 0.48 310.48 60 0.00 0.00 9.27 9.95 0.34 0.45 310.45 Page 26 Inflow/Outflow Simulation 10-Year Storm Event -'t1 c 0 u Q) I I \ I \ \ I \ \ \ ~ 4.00 --~~~~~1-----~~~,~-l-~~~~~+--~~~~-1-~~~~~+--~~~~--+~~~~~ Q) Q. -Q) Q) ..... u :c :s (.) -; 3.00 0 s :s 0 I I \ \ \ I 0.00 .... ---~~-+~~~~1--~~~-+-~~~~~~~~-+-~~~-+~~~---4 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-Development 'Free-Flow' 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 0.00 310.00 1 0.69 0.69 0.64 0.69 0.02 0.03 310.03 2 1.38 2.08 2.53 2.72 0.09 0.12 310.12 3 2.08 3.46 5.58 5.99 0.20 0.27 310.27 4 2.77 4.84 9.72 10.43 0.36 0.47 310.47 5 3.46 6.23 14.85 15.94 0.54 0.72 310.72 6 4.15 7.61 20.93 22.46 0.77 1.01 311.01 7 4.84 8.99 27.88 29.93 1.02 1.34 311.34 8 5.53 10.38 35.65 38.26 1.30 1.72 311 .72 9 6.23 11 .76 44.18 47.41 1.62 2.13 312.13 10 6.92 13.14 53.47 57.32 1.93 2.53 312.53 11 6.57 13.49 62.81 66.96 2.08 2.68 312.68 12 6.23 12.80 71 .19 75.61 2.21 2.74 312.74 13 5.88 12.11 78.65 83.30 2.33 2.79 312.79 14 5.53 11 .41 85.31 90.06 2.38 2.82 312.82 15 5.19 10.72 91 .21 96.03 2.41 2.84 312.84 16 4.84 10.03 96.37 101 .24 2.44 2.86 312.86 17 4.50 9.34 100.79 105.71 2.46 2.87 312.87 18 4.15 8.65 104.47 109.43 2.48 2.89 312.89 19 3.80 7.96 107.43 112.43 2.50 2.90 312.90 20 3.46 7.26 109.68 114.70 2.51 2.90 312.90 21 3.11 6.57 111.23 116.26 2.51 2.91 312.91 22 2.77 5.88 112.08 117.11 2.51 2.91 312.91 23 2.42 5.19 112.24 117.27 2.52 2.91 312.91 24 2.08 4.50 111 .71 116.74 2.51 2.91 312.91 25 1.73 3.80 110.50 115.52 2.51 2.91 312.91 26 1.38 3.11 108.61 113.61 2.50 2.90 312.90 27 1.04 2.42 106.05 111.03 2.49 2.89 312.89 28 0.69 1.73 102.83 107.78 2.47 2.88 312.88 29 0.35 1.04 98.97 103.87 2.45 2.87 312.87 30 0.00 0.35 94.46 99.31 2.43 2.85 312.85 31 0.00 0.00 89.66 94.46 2.40 2.83 312.83 32 0.00 0.00 84.91 89.66 2.38 2.82 312.82 33 0.00 0.00 80.21 84.91 2.35 2.80 312.80 34 0.00 0.00 75.65 80.21 2.28 2.77 312.77 35 0.00 0.00 71.23 75.65 2.21 2.74 312.74 36 0.00 0.00 66.95 71 .23 2.14 2.72 312.72 37 0.00 0.00 62.80 66.95 2.08 2.68 312.68 38 0.00 0.00 58.78 62.80 2.01 2.61 312.61 39 0.00 0.00 54.88 58.78 1.95 2.55 312.55 40 0.00 0.00 51 .14 54.88 1.87 2.46 312.46 41 0.00 0.00 47.65 51 .14 1.74 2.29 312.29 42 0.00 0.00 44.40 47.65 1.62 2.14 312.14 43 0.00 0.00 41.37 44.40 1.51 1.99 311.99 44 0.00 0.00 38.55 41 .37 1.41 1.86 311.86 45 0.00 0.00 35.92 38.55 1.31 1.73 311 .73 Page 28 46 0.00 0.00 33.47 35.92 1.22 1.61 311.61 47 0.00 0.00 31.19 33.47 1.14 1.50 311.50 48 0.00 0.00 29.06 31.19 1.06 1.40 311.40 49 0.00 0.00 27.08 29.06 0.99 1.30 311.30 50 0.00 0.00 25.23 27.08 0.92 1.22 311.22 51 0.00 0.00 23.51 25.23 0.86 1.13 311.13 52 0.00 0.00 21.91 23.51 0.80 1.05 311.05 53 0.00 0.00 20.41 21.91 0.75 0.98 310.98 54 0.00 0.00 19.02 20.41 0.70 0.92 310.92 55 0.00 0.00 17.72 19.02 0.65 0.85 310.85 56 0.00 0.00 16.52 17.72 0.60 0.80 310.80 57 0.00 0.00 15.39 16.52 0.56 0.74 310.74 58 0.00 0.00 14.34 15.39 0.52 0.69 310.69 59 0.00 0.00 13.36 14.34 0.49 0.64 310.64 60 0.00 0.00 12.45 13.36 0.46 0.60 310.60 Page 29 Inflow/Outflow Simulation 25-Year Storm Event 7.00 ,, ' \ I \ 6.00 \ I \ -\ "t:I 5.00 c 0 I \ u ~ (/) ... \ ~ 0.. -~ \ ~ 4.00 ..... u \ ..Q ::s ' u -~ 0 = -3.00 ::s 0 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-Development 'Free-Flow' 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 0.00 310.00 1 0.78 0.78 0.73 0.78 0.03 0.04 310.04 2 1.56 2.35 2.87 3.07 0.10 0.14 310.14 3 2.35 3.91 6.31 6.78 0.23 0.30 310.30 4 3.13 5.47 10.98 11.79 0.40 0.53 310.53 5 3.91 7.04 16.79 18.02 0.61 0.81 310.81 6 4.69 8.60 23.66 25.39 0.87 1.14 311.14 7 5.47 10.17 31.52 33.83 1.15 1.52 311.52 8 6.26 11.73 40.30 43.25 1.47 1.94 311.94 9 7.04 13.29 49.94 53.60 1.83 2.40 312.40 10 7.82 14.86 60.72 64.80 2.04 2.64 312.64 11 7.43 15.25 71.54 75.97 2.21 2.75 312.75 12 7.04 14.47 81.29 86.01 2.36 2.80 312.80 13 6.65 13.69 90.17 94.98 2.40 2.84 312.84 14 6.26 12.90 98.18 103.07 2.45 2.86 312.86 15 5.87 12.12 105.33 110.30 2.49 2.89 312.89 16 5.47 11.34 111.64 116.67 2.51 2.91 312.91 17 5.08 10.56 117.13 122.20 2.53 2.92 312.92 18 4.69 9.78 121.81 126.91 2.55 2.93 312.93 19 4.30 8.99 125.67 130.80 2.57 2.94 312.94 20 3.91 8.21 128.73 133.88 2.58 2.95 312.95 21 3.52 7.43 130.99 136.16 2.58 2.96 312.96 22 3.13 6.65 132.45 137.63 2.59 2.96 312.96 23 2.74 5.87 133.13 138.32 2.59 2.96 312.96 24 2.35 5.08 133.03 138.22 2.59 2.96 312.96 25 1.96 4.30 132.15 137.33 2.59 2.96 312.96 26 1.56 3.52 130.51 135.67 2.58 2.96 312.96 27 1.17 2.74 128.09 133.24 2.57 2.95 312.95 28 0.78 1.96 124.92 130.05 2.56 2.94 312.94 29 0.39 1.17 121.00 126.10 2.55 2.93 312.93 30 0.00 0.39 116.33 121.39 2.53 2.92 312.92 31 0.00 0.00 111.31 116.33 2.51 2.91 312.91 32 0.00 0.00 106.32 111.31 2.49 2.89 312.89 33 0.00 0.00 101.40 106.32 2.46 2.88 312.88 34 0.00 0.00 96.52 101.40 2.44 2.86 312.86 35 0.00 0.00 91.70 96.52 2.41 2.84 312.84 36 0.00 0.00 86.92 91.70 2.39 2.82 312.82 37 0.00 0.00 82.20 86.92 2.36 2.81 312.81 38 0.00 0.00 77.58 82.20 2.31 2.78 312.78 39 0.00 0.00 73.11 77.58 2.24 2.76 312.76 40 0.00 0.00 68.77 73.11 2.17 2.73 312.73 41 0.00 0.00 64.56 68.77 2.10 2.70 312.70 42 0.00 0.00 60.48 64.56 2.04 2.64 312.64 43 0.00 0.00 56.53 60.48 1.97 2.57 312.57 44 0.00 0.00 52.71 56.53 1.91 2.51 312.51 45 0.00 0.00 49.11 52.71 1.80 2.37 312.37 Page 31 46 0.00 0.00 45.76 49.11 1.67 2.20 312.20 47 0.00 0.00 42.64 45.76 1.56 2.05 312.05 48 0.00 0.00 39.73 42.64 1.45 1.91 311.91 49 0.00 0.00 37.02 39.73 1.36 1.78 311.78 50 0.00 0.00 34.50 37.02 1.26 1.66 311.66 51 0.00 0.00 32.15 34.50 1.18 1.55 311.55 52 0.00 0.00 29.95 32.15 1.10 1.44 311.44 53 0.00 0.00 27.91 29.95 1.02 1.34 311.34 54 0.00 0.00 26.01 27.91 0.95 1.25 311.25 55 0.00 0.00 24.23 26.01 0.89 1.17 311.17 56 0.00 0.00 22.58 24.23 0.83 1.09 311.09 57 0.00 0.00 21.04 22.58 0.77 1.01 311.01 58 0.00 0.00 19.61 21.04 0.72 0.94 310.94 59 0.00 0.00 18.27 19.61 0.67 0.88 310.88 60 0.00 0.00 17.02 18.27 0.62 0.82 310.82 Page 32 Inflow/Outflow Simulation 50-Year Storm Event -'tJ c 0 u Q> en I ' \ \ ' I \ \ \ ~ \ :_ 5 .oo~~~~~---t-~~~~-t-~~~~--+-~~~~-+-~~~~-+~~~~--t~~~~--; -Q> I \ Q> ""' u \ .Q §. 4.00 ---~~-,~~-+-~~~~--;~~~~~-+-~~~~--11--~~~~-+-~~~~~1--~~~~-< ~ 0 ;;:: -::II 0 0 10 ---Pre-Development Hydrograph 20 --•Post-Development Outflow With Detention 30 40 50 60 70 Time (Minutes) - - -Post-Development Outflow Hydrograph Without Detention • • • • • ·Post-Development 'Free-Flow' Page 33 46 0.00 0.00 51.51 55.28 1.89 2.48 312.48 47 0.00 0.00 48.00 51.51 1.76 2.31 312.31 48 0.00 0.00 44.72 48.00 1.64 2.15 312.15 49 0.00 0.00 41.67 44.72 1.53 2.01 312.01 50 0.00 0.00 38.83 41.67 1.42 1.87 311.87 51 0.00 0.00 36.18 38.83 1.32 1.74 311.74 52 0.00 0.00 33.71 36.18 1.23 1.62 311.62 53 0.00 0.00 31.42 33.71 1.15 1.51 311.51 54 0.00 0.00 29.27 31.42 1.07 1.41 311.41 55 0.00 0.00 27.28 29.27 1.00 1.31 311.31 56 0.00 0.00 25.42 27.28 0.93 1.22 311.22 57 0.00 0.00 23.68 25.42 0.87 1.14 311.14 58 0.00 0.00 22.07 23.68 0.81 1.06 311.06 59 0.00 0.00 20.56 22.07 0.75 0.99 310.99 60 0.00 0.00 19.16 20.56 0.70 0.92 310.92 Page 35 Inflow/Outflow Simulation 100-Year Storm Event 9.00 8.00 I• I \ I \ I \ I I ' I \ 7.00 I ' I \ I I ' 6.00 I \ I ' -"C c I \ I 0 u I ' Q) (/) I \ ... 5.00 Q) Q. I ' I \ I -Q) Q) ..... I ' I \ u :a I ' :s 4 .00 u I -~ 0 :::: -:s 0 3.00 I ' I I \ \ I ' I \ I . ' !/ \ \ . (\ \ ~ ' ' \ !I I \\. " ~ v \ " 2.00 1.00 0 .00 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph - - -Post-Development Outflow Hydrograph Without Detention --•Post-Development Outflow With Detention -- -- -·Post-Development 'Free-Flow' Inflow/Outflow Simulft1Dt13J..Year Storm Event Inflow/Outflow Simulation 2-Year Storm Event -'i:J c 0 1.50 C,J cu V) ... cu D.. -cu cu LI- C,J :a ::I (..) -;t: 0 1.00 :;: -::I 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 37 Inflow/Outflow Simulation 5-Year Storm Event 2.00 -"Cl c 0 u a> in ... a> ~ .... a> a> 1.50 ..... u ..Q ::I u -~ 0 = .... ::I 0 1.00 0.00 -1&~~~-+~~~~ ..... ~~~-+-~~~---4~~~~-1-~~~-+~~~----4 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 38 Inflow/Outflow Simulation 10-Year Storm Event 2.00 -"Cl c 0 IJ G.I (/) ... G.I a. -G.I G.I 1.50 ..... IJ .Q :l (.) -~ ..2 --:l 0 1.00 o.oo .-.~~~-1~~~~ ...... ~~~--1~~~~ ...... ~~~--11--~~~ ...... ~~~__, 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 39 -'1:1 c 0 u Q) en ... Q) 0.. -Q) Q) ..... u ..a :::::s Inflow/Outflow Simulation 25-Year Storm Event 2.00 ~ 1.50--~--~----+-~~~~++-~~~~+--~~~~>----~~----+~~~~--+~~~~-< :t 0 :;:: -:::::s 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 40 Inflow/Outflow Simulation 50-Year Storm Event -., 2.50 c 0 u Q) IJ) ... Q) ll.. -Q) Q) 2.00 ..... u .Q ::I 0 -~ 0 :;:: -1.50 ::I 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 41 Inflow/Outflow Simulation 100-Year Storm Event 3.00 -"C c 0 u a> <n ... 2.50 a> Q. -a> a> .... u :c ~ 2.00 u -~ 0 :;:: -~ 0 1.50 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 42 Detention Pond Storage Volumes as Percent of Maximum Volume 70% -1--------------------t GI § !HHHmimm~i~i~i 0 60%-1-------------1 > E ::I E ·~ 50% -r--------------1 :!:: -0 -c f: 40% ... GI ll.. 30% 20% 103 11111111111111111111111 2-year 5-year 10-year 11111111111111111111111 25-year Design Storm Storm Simulation Synopsis 2-ear 5· ear 10· ear 25-ear Storm Depth 2.68 2.80 2.85 2.91 Storm Elevation 312.68 312.80 312.85 312.91 Storm Volume 1950 2182 2877 3443 Maximum Capacity 4536 4536 4536 4536 Percent of Capacity 43% 48% 63% 76% Page 43 50-year 100-year 50-ear 100-ear 2.96 2.98 312.96 312.98 4072 4318 4536 4536 90% 95% Determine Total Pre·Development Peak Storm Water Discharge Rates Tributary Area ("A"): 2.27 Pervious Area: Impervious Area: Run-Off Coefficient ("Cwt"): Time Of Concentration ("T /c"): Woodlands: Pastures: Pavements: Acres 0.40 2.27 0.00 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 c = 0.40 c = 0.97 0.00 0.00 0.00 0.00 0.00 Feet I Second 0.00 Minutes 309.25 318.00 512.00 1.71 1.42 Feet I Second 5.99 Minutes 0.00 0.00 0.00 0.00 0.00 Feet I Second 0.00 Minutes 5.99 Use Min. Travel Time: 10.00 Minutes Hourly Intensity Rates ("I"): Peak Discharge Rate ("Q"): 2-Year: 5-Year: 10-Year: 25-Year: 50-Year: 100-Year: 5-Year: 10-Year: 25-Year: 50-Year: 100-Year: 6.33 7.69 8.63 9.86 11.15 11 .64 5.75 7.00 Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour Inches I Hour 7 .85 Cubic Feet I Second 8.97 Cubic Feet I Second 10.14 Cubic Feet I Second 10.59 Page 1 Determine Post-development Peak Storm Water Discharge (No Detention) Tributary Area ("A"): 2.27 Pervious Area: Impervious Area: Run -Off Coefficient ("Cwt"): Acres 0.84 0.53 1.74 Acres Acres c = 0.40 c = 0.97 Time Of Concentration ("T le"): 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 2-Year: 5-Year: 10-Year: 25-Year: 50-Year: 100-Year: Predevelopment 5.75 Ft31sec 7 .00 Ft31sec 7 .85 Ft31sec 8.97 Ft31sec 10.14 Ft31sec 10.59 Ft31sec Preliminary Determination Of Detention Pond Volume 2-Year: 6.29 Ft31sec x (30 Min. 5-Year: 7 .64 Ft31sec x (30 Min. 10-Year: 8.58 Ft31sec x (30 Min. 25-Year: 9.80 Ft31sec x (30 Min. 50-Year: 11 .08 Ft31sec x (30 Min. 100-Year: 11.56 Ft31sec x (30 Min. x 60 x 60 x 60 x 60 x 60 x 60 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 12.04 Cubic Feet I Second 14.64 Cubic Feet I Second 16.43 Cubic Feet I Second 18.77 Cubic Feet I Second 21.22 Cubic Feet I Second 22.15 Cubic Feet I Second Post-Development Increase Sec. Sec. Sec. Sec. Sec. Sec. 12.04 Ft31sec 14.64 Ft31sec 16.43 Ft31sec 18. 77 Ft31sec 21.22 Ft31sec 22.15 Ft31sec I 2 )= I 2 )= I 2 )= I 2 ) = I 2 ) = I 2 )= 6.29 Ft31sec 7.64 Ft31sec 8.58 Ft31sec 9.80 Ft31sec 11.08 Ft31sec 11.56 Ft31sec 5,658 Cubic 6,879 Cubic 7,722 Cubic 8,819 Cubic 9,969 Cubic 10,408 Cubic Time Base (Tb) = 3.00 x T le And Time Of Concentration (T le) Of 10 Minutes. Page 2 Feet Feet Feet Feet Feet Feet Determine Post-Development "Free-Flow" Peak Storm Water Discharge Tributary Area ("A"): 0.000 Pervious Area: Impervious Area: Run-Off Coefficient ("Cwt"): Acres 0.00 0.000 0.000 Acres Acres Time Of Concentration ("T /c"): 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: 0.00 5-Year: 0.00 10-Year: 0.00 25-Year: 0.00 50-Year: 0.00 100-Year: 0.00 Page 3 c = 0.40 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 Determine Post-Development Flow Into Detention Pond Tributary Area ("A"): 2.274 Pervious Area : Impervious Area: Run -Off Coefficient ("Cwt'): Time Of Concentration ("T /c"): Hourly Intensity Rates ("I "): Peak Discharge Rate ("Q"): Acres 0.84 0.531 1.743 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: 12.04 5-Year: 14.64 10-Year: 16.43 25-Year: .18.77 50-Year: 21.22 100-Year: 22.15 Page 4 c = 0.40 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 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 0.58 0.70 0.79 0.90 1.01 1.06 2 1.15 1.40 1.57 1.79 2.03 2.12 3 1.73 2.10 2.36 2.69 3.04 3.18 4 2.30 2.80 3.14 3.59 4.06 4.23 5 2.88 3.50 3.93 4.49 5.07 5.29 6 3.45 4.20 4.71 5.38 6.08 6.35 7 4.03 4.90 5.50 6.28 7.10 7.41 8 4.60 5.60 6.28 7.18 8.11 8.47 9 5.18 6.30 7.07 8.07 9.13 9.53 11 5.47 6.65 7.46 8.52 9.63 10.06 12 5.18 6.30 7.07 8.07 9.13 9.53 13 4.89 5.95 6.68 7.62 8.62 9.00 14 4.60 5.60 6.28 7.18 8.11 8.47 15 4.32 5.25 5.89 6.73 7.60 7.94 16 4.03 4.90 5.50 6.28 7.10 7.41 17 3.74 4.55 5.11 5.83 6.59 6.88 18 3.45 4.20 4.71 5.38 6.08 6.35 19 3.17 3.85 4.32 4.93 5.58 5.82 20 2.88 3.50 3.93 4.49 5.07 5.29 21 2.59 3.15 3.53 4.04 4.56 4.76 22 2.30 2.80 3.14 3.59 4.06 4.23 23 2.01 2.45 2.75 3.14 3.55 3.71 24 1.73 2.10 2.36 2.69 3.04 3.18 25 1.44 1.75 1.96 2.24 2.53 2.65 26 1.15 1.40 1.57 1.79 2.03 2.12 27 0.86 1.05 1.18 1.35 1.52 1.59 28 0.58 0.70 0.79 0.90 1.01 1.06 29 0.29 0.35 0.39 0.45 0.51 0.53 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 Page 5 900990000009909 000000000000000 000000000000000 009090000090999 000000000000000 000000000000000 900090000090000 000000000000000 000000000000000 009990009900900 000000000000000 000000000000000 900090900099990 000000000000000 000000000000000 990090099909909 000000000000000 000000000000000 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 1.20 1.46 1.64 1.88 2.12 2.22 2 2.41 2.93 3.29 3_75 4.24 4.43 3 3.61 4.39 4.93 5.63 6.36 6.65 4 4.82 5.86 6.57 7.51 8.49 8.86 5 6.02 7.32 8.22 9.38 10.61 11.08 6 7.22 8.78 9.86 11.26 12.73 13.29 7 8 .43 10.25 11.50 13.14 14.85 15.51 8 9.63 11.71 13.15 15.01 16.97 17.72 9 10.84 13.18 14.79 16.89 19.09 19.94 11 11.44 13.91 15.61 17.83 20.16 21.04 12 10.84 13.18 14.79 16.89 19.09 19.94 13 10.23 12.44 13.97 15.95 18.03 18.83 14 9.63 11.71 13.15 15.01 16.97 17.72 15 9.03 10.98 12.33 14.08 15.91 16.61 16 8.43 10.25 11.50 13.14 14.85 15.51 17 7.83 9.52 10.68 12.20 13.79 14.40 18 7.22 8.78 9.86 11.26 12.73 13.29 19 6.62 8.05 9.04 10.32 11.67 12.18 20 6.02 7.32 8.22 9.38 10.61 11.08 21 5.42 6.59 7.40 8.45 9.55 9.97 22 4.82 5.86 6.57 7.51 8.49 8.86 23 4.21 5.12 5.75 6.57 7.43 7.75 24 3.61 4.39 4.93 5.63 6.36 6.65 25 3.01 3.66 4.11 4.69 5.30 5.54 26 2.41 2.93 3.29 3.75 4.24 4.43 27 1.81 2.20 2.47 2.82 3.18 3.32 28 1.20 1.46 1.64 1.88 2.12 2.22 29 0.60 0.73 0 .82 0.94 1.06 1.11 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 Page 7 en ui ui ui ui ui ui ui ui ui ui .i::-.i::-.i::-.i::-o \.0 oo -....i en ui .i::-w N ~ o \.0 oo -....i en 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 999999999999999 000000000000000 000000000000000 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 0.00 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 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 Page 9 ""'O ~ OQ (!) ...... 0 O"I Ul Ul Ul Ul Ul Ul Ul Ul Ul Ul .j::. .j::. .j::. .j::. 0 l.O co -...) 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O"I 000000000000000 000000000000000 000000000000000 PPPPPPPPP9PPPPP 000000000000000 000000000000000 ppppppppppppppp 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 000000000000000 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 1.20 1.46 1.64 1.88 2.12 2.22 2 2.41 2.93 3.29 3.75 4.24 4.43 3 3.61 4.39 4.93 5.63 6.36 6.65 4 4.82 5.86 6.57 7.51 8.49 8.86 5 6.02 7.32 8.22 9.38 10.61 11.08 6 7.22 8.78 9.86 11.26 12.73 13.29 7 8.43 10.25 11.50 13.14 14.85 15.51 8 9.63 11.71 13.15 15.01 16.97 17.72 9 10.84 13.18 14.79 16.89 19.09 19.94 11 11.44 13.91 15.61 17.83 20.16 21.04 12 10.84 13.18 14.79 16.89 19.09 19.94 13 10.23 12.44 13.97 15.95 18.03 18.83 14 9.63 11.71 13.15 15.01 16.97 17.72 15 9.03 10.98 12.33 14.08 15.91 16.61 16 8.43 10.25 11.50 13.14 14.85 15.51 17 7.83 9.52 10.68 12.20 13.79 14.40 18 7.22 8.78 9.86 11.26 12.73 13.29 19 6.92 8.05 9.04 10.32 11.67 12.18 20 6.02 7.32 8.22 9.38 10.61 11.08 21 5.42 6.59 7.40 8.45 9.55 9.97 22 4.82 5.86 6.57 7.51 8.49 8.86 23 4.21 5.12 5.75 6.57 7.43 7.75 24 3.61 4.39 4.93 5.63 6.36 6.65 25 3.01 3.66 4.11 4.69 5.30 5.54 26 2.41 2.93 3.29 3.75 4.24 4.43 27 1.81 2.20 2.47 2.82 3.18 3.32 28 1.20 1.46 1.64 1.88 2.12 2.22 29 0.60 0.73 0 .82 0.94 1.06 1.11 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 Page 11 99999999999999999999 00000000000000000000 00000000000000000000 00000000000000000000 66666666666666666666 00000000000000000000 00000000000000000000 66666666666666666666 00000000000000000000 99999999999999999999 00000000000000000000 00000000000000000000 99999999999999999999 00000000000000000000 00000000000000000000 00000000000000000000 66666666666666666666 00000000000000000000 -"1:1 -"1:1 c Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 2-Year Storm Event 8 12.00--~~~_...~~~--+~~~~+--~~~-+-~~~--+-~~~--+~~~------j <II (/) ; 10.00--~~----#-+--__,.__~-+~~~~+--~~~-+-~~~----+-~~~--+~~~-----< 0. -~ 8.00--~~1----+-~~-----+~~~~+--~~~-+-~~~--+-~~~--+~~~---; ..... u ~ 6.oo--~--~---+-~~~~,--~~~+--~~~-+-~~~--+-~~~--+~~~---; ::i (.) -:0 4.00 ... IO ~ 2.00.--.r--+~~---+-~~~--+--'....._ ___ ~+--~~~-+-~~~--+-~~~--+~~~---; "' 0 0 10 20 30 40 50 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 70 § 14 .00--~~~-ll-'O.-.~~--+~~~~+--~~~---+-~~~--+~~~~+-~~~~ u <II (/) 12 .00 --~~-----l--4~~----+-~~~---+-~~~---<~~~~+-~~~-+-~~~~ ... <II ~ 10 .00 --~--.r---+-~--~-+-~~~-+-~~~-+-~~~-+-~~~-+-~~----; <II <II ~ 8.00--~-1-~--+-~~~~~~~~+--~~~---+-~~~--+~~~~+-~~~~ ~ ::i (.) -~ 4.oo----~·~--+-~~~-"<-f~~,--~+--~~~---+-~~~--+~~~~+-~~~~ IO .c u "' Q o.oo.,_ ______ ..... ______ ....., ______ ....,.. ______ ....... .,__ ______ .__ ______ +-------~ 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Post-Development Outflow Hydrograph Without Detention Page 13 -"O c 0 IJ Cl) en ... Cl) 0.. -Cl) Cl) ..... IJ :0 :::J (.) -Cl) ti.() ... ro .J: IJ VI Ci Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates 10-Year Storm Event 18.00 16.00 14.00 12.00 10.00 8.00 6.00 4.00 2.00 0 .00 I \ I \ I \ I \ I I ~ \ I I ~ \ II ~\ (I ~ 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 20.00 ~ 18.00 " I \ c 0 IJ 16.00 Cl) en ... 14.00 Cl) 0.. -12.00 Cl) Cl) ..... 10.00 IJ .a 8.00 :::J (.) -Cl) 6.00 ti.() ... ro 4.00 .J: IJ VI Ci 2.00 0.00 I \ I \ I \ I / ~ "'-... \ I I ~ \ I I ~--\ II ~\ {I ~ 0 10 20 30 40 50 60 Time (Minutes) --Pre-Development Hydrograph -Post-Development Outflow Hydrograph Without Detention Page 14 70 70 -"O c 0 Total Pre-Development Vs. Total Post-Development (No Detention) Peak Discharge Rates SO-Year Storm Event ~ 20 .00 ---~~~-#-t---~~~r--~~~-+-~~~---+-~~~~+--~~~-f-~~~--. IJ) ... Q) Q. ~ 15.00 ---~~-#--+-~~--~r--~~~-+-~~~---+-~~~~+--~~~-f-~~~--< Q) .... I,) ~ l0.00--~--1-~---,t.,c--~~~~~~~-+-~~~---+-~~~~t--~~~-+-~~~----j 0 -:0 ... ~ 5 .00----1---~--+-~~~~1-c-~~~-+-~~~---+-~~~~t--~~~-+-~~~----j I,) Ill Q -"O c 0 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 100-Year Storm Event 70 ~ 20 .00--~~~++-~~~~+--~~~--+-~~~~t--~~~-t-~~~--1~~~---1 IJ) ... Q) Q. ~ 15 .oo--~~--1----+-~~---~+--~~~---1-~~~~+---~~~-+-~~~--1~~~---1 Q) .... I,) ~ 10 .00+-~-l--~--;4'~~~~~~~~-+--~~~~+--~~~-+-~~~---i~~~----i 0 -:0 ... ~ 5 .00----1--+-~---+-~~~~----~-~~---1-~~~~t--~~~-+-~~~--1~~~---1 I,) Ill 0 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Post.Development Outflow Hydrograph Without Detention Page 15 Detention Pond De th Vs. Volume ~ Q) Q) ...... Elevation 309.29 309.50 310.00 311.00 312.00 312.75 Depth (Feet) 0.00 0.21 0.71 1.71 2.71 3.46 Detention Pond Depth Vs. Volume Volume (Ft3) 0 20 988 4488 7988 10613 ::; 2 .00+-~~~~-t-~~~~-t-~~--..P'--t-~~~~-t-~~~~-t-~~~-----1 -c.. Q) Q 0 2000 4000 6000 8000 10000 12000 Detention Pond Volume (Cubic Feet) Page 16 Rating Curve For Outlet Control Structure I Pipe Dia. 18.00 (in.) Deoth Vs. Volume 45.00 (Length In Feet) Elevation Depth Discharge (Feet) Ft3/Sec 309.29 0.00 0.00 0.00 309.50 0.21 0.13 0.12 310.00 0.71 1.29 1.15 311.00 1.71 5.33 4.02 312.00 2.71 7.73 5.63 312.75 3.46 9.12 6.58 Rating Curve For Outlet Control Structure Depth Vs. Volume --a; Q) ..... 4.00 3.50 3.00 2.50 -;; 2.00 -a. Q) Q 1.50 1.00 / ,,,,,,., ~ 0.50 ( 0.00 0.00 1.00 2.00 /' / I/' v ~ / v / ,,,,,,., / 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 Discharge (Cubic Feet Per Second) Page 17 0 0.13 1.34 5.76 8.43 9.97 !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 0.21 20 0.13 0.65 0.78 0.71 988 1.29 32.93 34.22 1.71 4,488 5.33 149.59 154.92 2.71 7,988 7.73 266.26 273.99 3.46 10,613 9.12 353.76 362.88 Storage Indication Curve 10.00 -7.00 "'C c 0 u Q) (/) ... 6.00 Q) Q. -Q) Q) L&. 5.00 u ..c ::i (.) -Q) 4.00 l).Q ... ('O .c u Ill 0 3.00 9.00 .J ~ v / v / / ,/ / / / / I , I 8.00 2.00 1.00 0.00 0.00 50.00 100.00 150.00 200.00 250.00 300.00 350.00 400.00 2s/t+O (Cubic Feet Per Second) Page 18 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 0.00 309.29 1 1.20 1.20 0.92 1.20 0.14 0.22 309.51 2 2.41 3.61 4.02 4.53 0.26 0.27 309.56 3 3.61 6.02 9.14 10.04 0.45 0.35 309.64 4 4.82 8.43 16.14 17.56 0.71 0.46 309.75 5 6.02 10.84 24.90 26.98 1.04 0.60 309.89 6 7.22 13.24 35.29 38.14 1.42 0.74 310.03 7 8.43 15.65 47.24 50.95 1.85 0.85 310.14 8 9.63 18.06 60.64 65.31 2.33 0.97 310.26 9 10.84 20.47 75.39 81.11 2.86 1.10 310.39 10 12.04 22.88 91.41 98.27 3.43 1.24 310.53 11 11 .44 23.48 106.91 114.89 3.99 1.38 310.67 12 10.84 22.28 120.26 129.19 4.47 1.50 310.79 13 10.23 21.07 131.59 141 .33 4.87 1.60 310.89 14 9.63 19.87 141.03 151 .45 5.21 1.68 310.97 15 9.03 18.66 148.85 159.70 5.42 1.75 311.04 16 8.43 17.46 155.20 166.31 5.56 1.81 311.10 17 7.83 16.26 160.14 171.46 5.66 1.85 311 .1 4 18 7.22 15.05 163.72 175.19 5.73 1.88 311.17 19 6.62 13.85 166.00 177.57 5.78 1.90 311 .19 20 6.02 12.64 167.04 178.65 5.80 1.91 311 .20 21 5.42 11 .44 166.88 178.48 5.80 1.91 311.20 22 4.82 10.23 165.56 177.11 5.77 1.90 311.19 23 4.21 9.03 163.15 174.59 5.72 1.88 311.17 24 3.61 7.83 159.68 170.98 5.65 1.84 311.13 25 3.01 6.62 155.19 166.30 5.55 1.81 311.10 26 2.41 5.42 149.73 160.61 5.44 1.76 311 .05 27 1.81 4.21 143.36 153.94 5.29 1.70 310.99 28 1.20 3.01 136.29 146.37 5.04 1.64 310.93 29 0.60 1.81 128.57 138.10 4.76 1.57 310.86 30 0.00 0.60 120.24 129.17 4.46 1.50 310.79 31 0.00 0.00 111 .91 120.24 4.17 1.42 310.71 32 0.00 0.00 104.13 111 .91 3.89 1.35 310.64 33 0.00 0.00 96.88 104.13 3.63 1.29 310.58 34 0.00 0.00 90.11 96.88 3.39 1.23 310.52 35 0.00 0.00 83.79 90.11 3.16 1.17 310.46 36 0.00 0.00 77.89 83.79 2.95 1.12 310.41 37 0.00 0.00 72.39 77.89 2.75 1.07 310.36 38 0.00 0.00 67.25 72.39 2.57 1.03 310.32 39 0.00 0.00 62.46 67.25 2.40 0.98 310.27 40 0.00 0.00 57.99 62.46 2.24 0.94 310.23 41 0.00 0.00 53.81 57.99 2.09 0.91 310.20 42 0.00 0.00 49.92 53.81 1.95 0.87 310.16 43 0.00 0.00 46.29 49.92 1.82 0.84 310.13 44 0.00 0.00 42.89 46.29 1.70 0.81 310.10 45 0.00 0.00 39.73 42.89 1.58 0.78 310.07 Page 19 ' 46 0.00 0.00 36.78 39.73 1.48 0.76 310.05 47 0.00 0.00 34.02 36.78 1.38 0.73 310.02 48 0.00 0.00 31.45 34.02 1.29 0.71 310.00 49 0.00 0.00 29.06 31.45 1.20 0.67 309.96 50 0.00 0.00 26.83 29.06 1.11 0.63 309.92 51 0.00 0.00 24.76 26.83 1.04 0.60 309.89 52 0.00 0.00 22.84 24.76 0.96 0.57 309.86 53 0.00 0.00 21.04 22.84 0.90 0.54 309.83 54 0.00 0.00 19.38 21.04 0.83 0.51 309.80 55 0.00 0.00 17.83 19.38 0.78 0.49 309.78 56 0.00 0.00 16.38 17.83 0.72 0.46 309.75 57 0.00 0.00 15.04 16.38 0.67 0.44 309.73 58 0.00 0.00 13.79 15.04 0.62 0.42 309.71 59 0.00 0.00 12.63 13.79 0.58 0.40 309.69 60 0.00 0.00 11.55 12.63 0.54 0.39 309.68 Page 20 Inflow/Outflow Simulation 2-Year Storm Event -"Cl c 0 u QI IJ) ... QI fl. -QI QI .... u .c :l (.) -~ 0 ;: -:l 0 I I I I I \ \ \ I \ \ \ \ \ \ 0.00 ~~~~ .... ~~~~1--~~~-1-~~~ .... ~~~~1--~~~-+-~~~--1 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-Development "Free-Flow" Page 21 Time (Minutes) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 Inflow (Ft3/Sec) 0.00 1.46 2.93 4.39 5.86 7.32 8.78 10.25 11.71 13.18 14.64 13.91 13.18 12.44 11 .71 10.98 10.25 9.52 8.78 8.05 7.32 6.59 5.86 5.12 4.39 3.66 2.93 2.20 1.46 0.73 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 11+ 12 0.00 1.46 4.39 7.32 10.25 13.18 16.11 19.03 .21 .96 24.89 27.82 28.55 27.09 25.62 24.16 22.69 21 .23 19.77 18.30 16.84 15.37 13.91 12.44 10.98 9.52 8.05 6.59 5.12 3.66 2.20 0.73 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Inflow I Outflow Simulation 5-Year Storm Event 2s/t-0 0.00 1.16 4.97 11 .23 19.78 30.46 43.16 57.74 74.07 92.05 111 .56 130.45 146.78 161 .05 173.33 183.72 192.27 199.08 204.21 207.73 209.70 210.18 209.24 206.93 203.31 198.44 192.35 185.11 176.75 167.32 156.88 146.15 136.08 126.69 117.93 109.75 102.12 95.00 88.35 82.15 76.36 70.96 65.92 61 .22 56.83 52.73 2s/t+O 0.00 1.46 5.55 12.29 21 .48 32.96 46.57 62.19 79.70 98.96 119.87 140.11 157.54 172.40 185.21 196.03 204.95 212.04 217.38 221 .05 223.10 223.60 222.62 220.22 216.45 211.37 205.02 197.48 188.77 178.95 168.06 156.88 146.15 136.08 126.69 117.93 109.75 102.12 95.00 88.35 82.15 76.36 70.96 65.92 61 .22 56.83 Page 22 Outflow (Ft3/Sec) 0.00 0.15 0.29 0.53 0.85 1.25 1.70 2.23 2.81 3.46 4.15 4.83 5.38 5.68 5.94 6.16 6.34 6.48 6.59 6.66 6.70 6.71 6.69 6.64 6.57 6.47 6.34 6.18 6.01 5.81 5.59 5.36 5.03 4.70 4.38 4.09 3.82 3.56 3.32 3.10 2.89 2.70 ,2.52 2.35 2.19 2.05 Depth (Feet) 0.00 0.22 0.28 0.38 0.52 0.69 0.81 0.94 1.09 1.25 1.42 1.59 1.73 1.86 1.96 2.06 2.13 2.19 2.23 2.27 2.28 2.29 2.28 2.26 2.23 2.18 2.13 2.07 1.99 1.91 1.82 1.73 1.64 1.55 1.48 1.40 1.34 1.27 1.21 1.16 1.11 1.06 1.01 0.97 0.93 0.90 Elevation 309.29 309.51 309.57 309.67 309.81 309.98 310.10 310.23 310.38 310.54 310.71 310.88 311 .02 311.15 311.25 311 .35 311 .42 311.48 311.52 311 .56 311 .57 311 .58 311.57 311.55 311 .52 311 .47 311 .42 311 .36 311 .28 311.20 311 .11 311 .02 310.93 310.84 310.77 310.69 310.63 310.56 310.50 310.45 310.40 310.35 310.30 310.26 310.22 310.19 46 0.00 0.00 48.91 52.73 1.91 0.86 310.15 47 0.00 0.00 45.34 48.91 1.78 0.83 310.12 48 0.00 0.00 42.02 45.34 1.66 0.80 310.09 49 0.00 0.00 38.91 42.02 1.55 0.77 310.06 50 0.00 0.00 36.01 38.91 1.45 0.75 310.04 51 0.00 0.00 33.31 36.01 1.35 0.72 310.01 52 0.00 0.00 30.79 33.31 1.26 0.70 309.99 53 0.00 0.00 28.44 30.79 1.17 0.66 309.95 54 0.00 0.00 26.26 28.44 1.09 0.62 309.91 55 0.00 0.00 24.23 26.26 1.02 0.59 309.88 56 0.00 0.00 22.34 24.23 0.94 0.56 309.85 57 0.00 0.00 20.58 22.34 0.88 0.53 309.82 58 0.00 0.00 18.95 20.58 0.82 0.51 309.80 59 0.00 0.00 17.43 18.95 0.76 0.48 309.77 60 0.00 0.00 16.01 17.43 0.71 0.46 309.75 Page 23 Inflow/Outflow Simulation 5-Year Storm Event •' 14.00 I \ \ 12.00 ' I \ \ -I \ "1:J c 10.00 0 c.> \ Q) (/) ... Q) I \ ll.. -Q) Q) 8.00 LI. c.> :c ::I u -~ 0 :;: -6.00 ::I 0 0 10 20 30 40 50 60 70 Time (Minutes) ---Pre·Development Hydrograph - - -Post·Development Outflow Hydrograph Without Detention ---Post·Development Outflow With Detention - - - - -· Post·Development "Free· Flow" Page 24 Inflow I Outflow Simulation 10-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 0.00 309.29 1 1.64 1.64 1.33 1.64 0.16 0.22 309.51 2 3.29 4.93 5.62 6.26 0.32 0.29 309.58 3 4.93 8.22 12.67 13.84 0.58 0.41 309.70 4 6.57 11 .50 22.29 24.18 0.94 0.56 309.85 5 8.22 14.79 34.31 37.08 1.39 0.73 310.02 6 9.86 18.08 48.58 52.38 1.90 0.86 310.15 7 11 .50 21 .36 64.97 69.95 2.49 1.01 310.30 8 13.15 24.65 83.34 89.62 3.14 1.17 310.46 9 14.79 27.94 103.54 111 .27 3.87 1.35 310.64 10 16.43 31 .22 125.46 134.76 4.65 1.54 310.83 11 15.61 32.05 146.75 157.51 5.38 1.73 311.02 12 14.79 30.40 165.61 177.15 5.77 1.90 311.19 13 13.97 28.76 182.12 194.36 6.12 2.04 311.33 14 13.15 27.12 196.39 209.24 6.42 2.17 311 .46 15 12.33 25.47 208.51 221 .86 6.68 2.27 311 .56 16 11 .50 23.83 218.56 232.34 6.89 2.36 311 .65 17 10.68 22.19 226.63 240.75 7.06 2.43 311 .72 18 9.86 20.54 232.79 247.17 7.19 2.48 311 .77 19 9.04 18.90 237.13 251 .69 7.28 2.52 311 .81 20 8.22 17.26 239.72 254.39 7.33 2.55 311 .84 21 7.40 15.61 240.63 255.33 7.35 2.55 311 .84 22 6.57 13.97 239.92 254.59 7.34 2.55 311 .84 23 5.75 12.33 237.66 252.24 7.29 2.53 311 .82 24 4.93 10.68 233.92 248.34 7.21 2.49 311 .78 25 4.11 9.04 228.75 242.96 7.10 2.45 311 .74 26 3.29 7.40 222.21 236.15 6.97 2.39 311 .68 27 2.47 5.75 214.37 227.97 6.80 2.32 311.61 28 1.64 4.11 205.26 218.47 6.61 2.24 311 .53 29 0.82 2.47 194.94 207.72 6.39 2.15 311 .44 30 0.00 0.82 183.46 195.76 6.15 2.05 311 .34 31 0.00 0.00 171 .66 183.46 5.90 1.95 311.24 32 0.00 0.00 160.33 171 .66 5.66 1.85 311 .14 33 0.00 0.00 149.46 160.33 5.43 1.76 311 .05 34 0.00 0.00 139.18 149.46 5.14 1.66 310.95 35 0.00 0.00 129.58 139.18 4.80 1.58 310.87 36 0.00 0.00 120.62 129.58 4.48 1.50 310.79 37 0.00 0.00 112.26 120.62 4.18 1.43 310.72 38 0.00 0.00 104.46 112.26 3.90 1.36 310.65 39 0.00 0.00 97.19 104.46 3.64 1.29 310.58 40 0.00 0.00 90.39 97.19 3.40 1.23 310.52 41 0.00 0.00 84.05 90.39 3.17 1.18 310.47 42 0.00 0.00 78.14 84.05 2.96 1.12 310.41 43 0.00 0.00 72.62 78.14 2.76 1.07 310.36 44 0.00 0.00 67.47 72.62 2.58 1.03 310.32 Page 25 45 0.00 0.00 62.66 67.47 2.40 0.99 310.28 46 0.00 0.00 58.18 62.66 2.24 0.95 310.24 47 0.00 0.00 53.99 58.18 2.09 0.91 310.20 48 0.00 0.00 50.09 53.99 1.95 0.87 310.16 49 0.00 0.00 46.44 50.09 1.82 0.84 310.13 50 0.00 0.00 43.04 46.44 1.70 0.81 310.10 51 0.00 0.00 39.86 43.04 1.59 0.78 310.07 52 0.00 0.00 36.90 39.86 1.48 0.76 310.05 53 0.00 0.00 34.14 36.90 1.38 0.73 310.02 54 0.00 0.00 31.56 34.14 1.29 0.71 310.00 55 0.00 0.00 29.16 31.56 1.20 0.67 309.96 56 0.00 0.00 26.93 29.16 1.12 0.63 309.92 57 0.00 0.00 24.85 26.93 1.04 0.60 309.89 58 0.00 0.00 22.92 24.85 0.97 0.57 309.86 59 0.00 0.00 21.12 22.92 0.90 0.54 309.83 60 0.00 0.00 19.45 21.12 0.84 0.51 309.80 Page 26 Inflow/Outflow Simulation 10-Year Storm Event 18.00 -----~---~---~----~---~---~---~ 16.00 I \ I ' I \ I 14.00 I \ I \ 12.00 -I \ "Cl I c 0 u \ <II (/) ... 10.00 <II I Q.. I -<II <II \ ..... u .a I ::I 0 8.00 I -~ 0 --::I 0 I I 6.00 \ I \ I 4.00 I \ I \ 2.00 0.00~~~~-1-~~~~1--~~~.:t-~~~ ... ~~~~1--~~~-1-~~~~ 0 10 20 30 40 50 60 70 Time (Minutes) ---Pre-Development Hydrograph • • • Post-Development Outflow Hydrograph Without Detention -----·Post-Development 'Free-Flow" ---Post-Development Outflow With Detention Page 27 Time (Minutes) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 Inflow (Ft3/Sec) 0.00 1.88 3.75 5.63 7.51 9.38 11 .26 13.14 15.01 16.89 18.77 17.83 16.89 15.95 15.01 14.08 13.14 12.20 11 .26 10.32 9.38 8.45 7.51 6.57 5.63 4.69 3.75 2.82 1.88 0.94 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 11+ 12 0.00 1.88 5.63 9.38 13.14 16.89 20.65 24.40 28.15 31.91 35.66 36.60 34 .72 32 .85 30.97 29.09 27.21 25.34 23.46 21 .58 19.71 17.83 15.95 14.08 12.20 10.32 8.45 6.57 4.69 2.82 0.94 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Inflow I Outflow Simulation 25-Year Storm Event 2s/t-O 0.00 1.55 6.48 14.55 25.56 39.32 55.66 74.41 95.41 118.51 143.57 168.50 190.62 210.05 226.89 241 .25 253.23 262.96 270.57 276.13 279.69 281 .32 281 .09 279.04 275.24 269.74 262.59 253.90 243.75 232.21 219.34 206.09 193.37 181 .17 169.46 158.22 147.44 137.29 127.82 118.98 110.73 103.03 95.85 89.15 82.89 77.05 2s/t+O 0.00 1.88 7.18 15.86 27.69 42.45 59.96 80.06 102.56 127.32 154.17 180.17 203.22 223.47 241.02 255.98 268.46 278.56 286.42 292.15 295.83 297.52 297.27 295.16 291 .24 285.56 278.18 269.16 258.59 246.57 233.15 219.34 206.09 193.37 181.17 169.46 158.22 147.44 137.29 127.82 118.98 110.73 103.03 95.85 89.15 82.89 Page 28 Outflow (Ft3/Sec) 0.00 0.17 0.35 0.65 1.07 1.57 2.15 2.82 3.58 4.40 5.30 5.84 6.30 6.71 7.06 7.37 7.62 7.80 7.92 8.01 8.07 8.10 8.09 8.06 8.00 7.91 7.80 7.63 7.42 7.18 6.91 6.63 6.36 6.10 5.86 5.62 5.39 5.08 4.74 4.42 4.12 3.85 3.59 3.35 3.13 2.92 Depth (Feet) 0.00 0.23 0.31 0.44 0.61 0.78 0.92 1.09 1.28 1.48 1.70 1.92 2.12 2.29 2.43 2.56 2.66 2.75 2.81 2.86 2.89 2.91 2.91 2.89 2.86 2.81 2.75 2.67 2.58 2.48 2.37 2.25 2.14 2.03 1.93 1.83 1.74 1.65 1.56 1.49 1.41 1.34 1.28 1.22 1.17 1.11 Elevation 309.29 309.52 309.60 309.73 309.90 310.07 310.21 310.38 310.57 310.77 310.99 311 .21 311.41 311 .58 311 .72 311.85 311 .95 312.04 312.10 312.15 312.18 312.20 312.20 312.18 312.15 312.10 312.04 311.96 311 .87 311.77 311.66 311.54 311.43 311 .32 311.22 311 .12 311 .03 310.94 310.85 310.78 310.70 310.63 310.57 310.51 310.46 310.40 46 0.00 0.00 71.61 77.05 2.72 1.06 310.35 47 0.00 0.00 66.52 71.61 2.54 1.02 310.31 48 0.00 0.00 61.78 66.52 2.37 0.98 310.27 49 0.00 0.00 57.35 61.78 2.21 0.94 310.23 50 0.00 0.00 53.22 57.35 2.07 0.90 310.19 51 0.00 0.00 49.37 53.22 1.93 0.87 310.16 52 0.00 0.00 45.77 49.37 1.80 0.84 310.13 53 0.00 0.00 42.41 45.77 1.68 0.81 310.10 54 0.00 0.00 39.28 42.41 1.57 0.78 310.07 55 0.00 0.00 36.36 39.28 1.46 0.75 310.04 56 0.00 0.00 33.63 36.36 1.36 0.73 310.02 57 0.00 0.00 31.09 33.63 1.27 0.70 309.99 58 0.00 0.00 28.72 31.09 1.18 0.66 309.95 59 0.00 0.00 26.52 28.72 1.10 0.63 309.92 60 0.00 0.00 24.47 26.52 1.02 0.59 309.88 Page 29 Inflow/Outflow Simulation 25-Year Storm Event ' 18.00 I I \ I 16.00 I \ I 14.00 I \ -I "C c \ 0 12.00 u Q) (I) ... I \ Q) I Q.. -Q) \ Q) 10.00 ..... u ..c I :I I 0 -~ 0 8.00 ::;:::: -:I 0 6.00 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-Development "Free-Flow" Page 30 Time (Minutes) 0 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 Inflow (Ft3/Sec) 0.00 2.12 4.24 6.36 8.49 10.61 12.73 14.85 16.97 19.09 21.22 20.16 19.09 18.03 16.97 15.91 14.85 13.79 12.73 11.67 10.61 9.55 8.49 7.43 6.36 5.30 4.24 3.18 2.12 1.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 11+ 12 0.00 2.12 6.36 10.61 14.85 19.09 23.34 27.58 31 .82 36.07 40.31 41.37 39.25 37.13 35.01 32.89 30.76 28.64 26.52 24.40 22.28 20.16 18.03 15.91 13.79 11 .67 9.55 7.43 5.30 3.18 1.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Inflow I Outflow Simulation 50-Year Storm Event 2s/t-O 0.00 1.77 7.37 16.53 28.99 44.57 63.08 84.30 108.07 134.21 163.08 191.80 217.32 239.78 259.30 276.16 290.43 302.20 311 .55 318.54 323.27 325.79 326.17 324.49 320.81 315.19 307.68 298.36 287.28 274.48 260.03 245.14 230.84 217.13 203.96 191 .33 179.21 167.58 156.42 145.71 135.67 126.31 117.57 109.42 101.81 94.71 2s/t+O 0.00 2.12 8.14 17.98 31 .38 48.08 67.91 90.66 116.13 144.14 174.52 204.45 231 .05 254.45 274.79 292.19 306.92 319.07 328.72 335.94 340.82 343.42 343.82 342.09 338.28 332.48 324.73 315.11 303.67 290.46 275.54 260.03 245.14 230.84 217.13 203.96 191 .33 179.21 167.58 156.42 145.71 135.67 126.31 117.57 109.42 101 .81 Page 31 Outflow (Ft3/Sec) 0.00 0.17 0.38 0.73 1.19 1.76 2.42 3.18 4.03 4.96 5.72 6.33 6.86 7.34 7.74 8.02 8.25 8.44 8.59 8.70 8.78 8.82 8.82 8.80 8.74 8.65 8.52 8.37 8.19 7.99 7.75 7.45 7.15 6.86 6.58 6.32 6.06 5.82 5.58 5.36 5.02 4.68 4.37 4.08 3.80 3.55 Depth (Feet) 0.00 0.23 0.32 0.47 0.67 0.82 0.99 1.18 1.39 1.62 1.87 2.13 2.35 2.55 2.72 2.86 2.99 3.09 3.17 3.23 3.27 3.30 3.30 3.28 3.25 3.20 3.14 3.06 2.96 2.85 2.72 2.59 2.47 2.35 2.23 2.12 2.02 1.91 1.82 1.72 1.63 1.55 1.47 1.40 1.33 1.27 Elevation 309.29 309.52 309.61 309.76 309.96 310.11 310.28 310.47 310.68 310.91 311 .16 311 .42 311 .64 311 .84 312.01 312.15 312.28 312.38 312.46 312.52 312.56 312.59 312.59 312.57 312.54 312.49 312.43 312.35 312.25 312.14 312.01 311 .88 311 .76 311.64 311 .52 311.41 311 .31 311 .20 311.11 311 .01 310.92 310.84 310.76 310.69 310.62 310.56 46 0.00 0.00 88.08 94.71 3.31 1.21 310.50 47 0.00 0.00 81 .90 88.08 3.09 1.16 310.45 48 0.00 0.00 76.13 81 .90 2.89 1.10 310.39 49 0.00 0.00 70.74 76.13 2.69 1.06 310.35 50 0.00 0.00 65.71 70.74 2.51 1.01 310.30 51 0.00 0.00 61.03 65.71 2.34 0.97 310.26 52 0.00 0.00 56.65 61 .03 2.19 0.93 310.22 53 0.00 0.00 52.57 56.65 2.04 0.90 310.19 54 0.00 0.00 48.75 52.57 1.91 0.86 310.15 55 0.00 0.00 45.20 48.75 1.78 0.83 310.12 56 0.00 0.00 41.88 45.20 1.66 0.80 310.09 57 0.00 0.00 38.78 41 .88 1.55 0.77 310.06 58 0.00 0.00 35.89 38.78 1.44 0.75 310.04 59 0.00 0.00 33.20 35.89 1.35 0.72 310.01 60 0.00 0.00 30.68 33.20 1.26 0.69 309.98 Page 32 Inflow/Outflow Simulation SO-Year Storm Event ' 20.00 I \ \ \ \ -"O \ c 0 u 15.00 GI \ V> ... ' GI \ 0.. -GI GI \ ..... u ..0 \ ::::s 0 ' -~ 0 10.00 = -::::s 0 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-Development 'Free-Flow' 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 0.00 309.29 1 2.22 2.22 1.86 2.22 0.18 0.23 309.52 2 4.43 6.65 7.71 8.51 0.40 0.33 309.62 3 6.65 11.08 17.28 18.79 0.75 0.48 309.77 4 8.86 15.51 30.30 32 .79 1.24 0.69 309.98 5 11 .08 19.94 46.58 50.24 1.83 0.84 310.13 6 13.29 24.37 65.91 70.95 2.52 1.01 310.30 7 15.51 28.80 88.08 94.71 3.31 1.21 310.50 8 17.72 33.23 112.90 121.31 4.20 1.43 310.72 9 19.94 37.66 140.20 150.56 5.18 1.67 310.96 10 22.1 5 42.09 170.54 182.29 5.88 1.94 311 .23 11 21 .04 43.20 200.71 213.73 6.51 2.20 311 .49 12 19.94 40.98 227.53 241 .69 7.08 2.44 311.73 13 18.83 38.77 251 .15 266.30 7.57 2.65 311 .94 14 17.72 36.55 271 .81 287.70 7.94 2.83 312.12 15 16.61 34.34 289.68 306.15 8.23 2.98 312.27 16 15.51 32 .12 304.84 321 .80 8.48 3.11 312.40 17 14.40 29.91 317.38 334.75 8.68 3.22 312.51 18 13.29 27.69 327.39 345.07 8.84 3.31 312.60 19 12.18 25.47 334.93 352.86 8.97 3.38 312.67 20 11 .08 23.26 340.09 358.19 9.05 3.42 312.71 21 9.97 21 .04 342.95 361 .14 9.10 3.45 312.74 22 8.86 18.83 343.56 361 .77 9.11 3.45 312.74 23 7.75 16.61 342.02 360.18 9.08 3.44 312.73 24 6.65 14.40 338.37 356.42 9.02 3.41 312.70 25 5.54 12.18 332 .70 350.56 8.93 3.36 312.65 26 4.43 9.97 325.06 342.67 8.81 3.29 312.58 27 3.32 7.75 315.51 332.81 8.65 3.21 312.50 28 2.22 5.54 304.11 321 .04 8.47 3.11 312.40 29 1.11 3.32 290.93 307.43 8.25 2.99 312.28 30 0.00 1.11 276.01 292.03 8.01 2.86 312.15 31 0.00 0.00 260.48 276.01 7.76 2.73 312.02 32 0.00 0.00 245.57 260.48 7.46 2.60 311 .89 33 0.00 0.00 231 .26 245.57 7.16 2.47 311 .76 34 0.00 0.00 217.52 231 .26 6.87 2.35 311 .64 35 0.00 0.00 204.35 217.52 6.59 2.24 311 .53 36 0.00 0.00 191.70 204.35 6.32 2.13 311.42 37 0.00 0.00 179.56 191.70 6.07 2.02 311 .31 38 0.00 0.00 167.92 179.56 5.82 1.92 311 .21 39 0.00 0.00 156.74 167.92 5.59 1.82 311 .11 40 0.00 0.00 146.02 156.74 5.36 1.73 311 .02 41 0.00 0.00 135.96 146.02 5.03 1.64 310.93 42 0.00 0.00 126.58 135.96 4.69 1.55 310.84 43 0.00 0.00 117.82 126.58 4.38 1.48 310.77 44 0.00 0.00 109.65 117.82 4.09 1.40 310.69 45 0.00 0.00 102.03 109.65 3.81 1.33 310.62 Page 34 46 0.00 0.00 94.91 102.03 3.56 1.27 310.56 47 0.00 0.00 88.27 94.91 3.32 1.21 310.50 48 0.00 0.00 82.07 88.27 3.10 1.16 310.45 49 0.00 0.00 76.29 82.07 2.89 1.11 310.40 50 0.00 0.00 70.90 76.29 2.70 1.06 310.35 51 0.00 0.00 65.86 70.90 2.52 1.01 310.30 52 0.00 0.00 61.16 65.86 2.35 0.97 310.26 53 0.00 0.00 56.78 61.16 2.19 0.93 310.22 54 0.00 0.00 52.68 56.78 2.05 0.90 310.19 55 0.00 0.00 48.86 52.68 1.91 0.86 310.15 56 0.00 0.00 45.30 48.86 1.78 0.83 310.12 57 0.00 0.00 41.98 45.30 1.66 0.80 310.09 58 0.00 0.00 38.87 41.98 1.55 0.77 310.06 59 0.00 0.00 35.98 38.87 1.45 0.75 310.04 60 0.00 0.00 33.27 35.98 1.35 0.72 310.01 Page 35 Inflow/Outflow Simulation 100-Year Storm Event 25.00 ------,-----,..----r-------,-------,-------,----, I \ I \ 20.00 \ I \ \ -"'t:I c I \ 0 u 15.00 Cl) V> \ ... Cl) a. -Cl) I \ Cl) ...... u \ :.c :::s u I -~ 0 10.00 :;: -:::s 0 0 10 20 30 40 50 60 70 Time (Minutes) ---Pre-Development Hydrograph • • • Post-Development Outflow Hydrograph Without Detention • • • • • ·Post-Development 'Free-Flow' --•Post-Development Outflow With Detention Inflow/Outflow Simulftlrm3J..Year Storm Event Inflow/Outflow Simulation 2-Year Storm Event 7.oo-~~~~~~~~~~~~--.-~~~-.-~~~--.-~~~----,~~~-. 6.00..._~~~-+-~~~-+-~~~--+-~~~-+---~~~-+--~~~-----t-~~~--i 5.00..._~~--l--+----\-•'-----~-!-~~~11-+~~~~1--~~~-+-~~~-+-~~~-----; -"C c 0 u Q> "' 4.00 ... Q> 0.. -Q> Q> L&. u :c ::II ~ 3.00 :l 0 s ::II 0 2.00+·~-f----lt--+--~~~-+-~\--~~+--~~~-+--'-~~~+-~~~--+-~~~~ i.00~1-----~--+-~~~-!-~~-\-----+~~~~1--~~~~~~~--+---~~~~ 0.001'-~~~+-~~~-+-~~~-+-~~~-+-~~~-+-~~~-+-~~~--1 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post·Development Hydrograph Page 37 Inflow/Outflow Simulation 5-Year Storm Event 8.oo--~~~~~~~---.-~~~-.-~~~--.~~~_..,.~~~--,~~~-------, 7.00+-~~~-+-~~~-+--~~~-t-~~~-+~~~--+~~~--j~~~---j 6.00.&. '-l-~~+--~~~'--+-~~~~-+-~~~~-+-~~~~-1-~~~~-1 --g 5.00 0 u cu !/) ... cu Q. -cu ~ 4.00 u :0 :J (,) -~ 0 ::: ~ 3.00 0 2.00 J.__J_-f--+-----l---\--+---+--.Y--lr----1-----J l.OO~~.-~-+-~~~-t-~~---\-~t--~~~-+-~~~---+-~--"'.--+~~~--l 0.00+-~~~-+-~~~-+-~~~-+-~~~--+~~~ ..... ~~~--11--~~---1 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 38 Inflow/Outflow Simulation 10-Year Storm Event 6.00 -.,, c 0 (,,) Q) en .... 5.00 Q) 0.. -Q) Q) Y.. (,,) ..c :J 4.00 u -~ 0 :;:: -:J 0 3.00 0.00..-~~~-+~~~~-t-~~~--1~~~~-+-~~~--t~~~~-+-~~~--t 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 39 Inflow/Outflow Simulation 25-Year Storm Event 10.00------.---------.--------,----,-------,-------,---------, 9.00-------+-------+--~~-1-~~~--+---~~~--+-~~~-----t-~~~----j 8.00 .I. I I \ ~ I I I 7.00 -"C c 0 y 6.00 cu (/) ... cu 0.. -cu cu 5.00 ..... y :c ::I u -~ 4.00 0 :;: -::I 0 3.00 2.00 •---i---.--+---------t---+----+---------t---------------t-------l i.00----.~~-t-~~~-1-~~--+--1-~~~--+---~~~--+-~~~~~~~----l 0.00~~~~+-~~~+-~~~-+-~~~-t-~~~-+-~~~-+~~~-1 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 40 Inflow/Outflow Simulation SO-Year Storm Event 8.00 -"t:1 c 0 IJ Q) (/) ... Q) a. -Q) Q) 6.00 ..... IJ ..Q ::::s (.) -~ 0 ;: -::::s 0 4.00 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 41 Inflow/Outflow Simulation 100-Year Storm Event 12.00---~~~--.-~~~-.-~~~----.~~~----,~~~~,-~~~-,--~~----, 10.00--~~~-f+-\~~~-t-~~~-+~~~-----j~~~~-j--~~~--t-~~~~ 8.00 -"C c 0 u Q) ,,, ... Q) ll.. .... Q) Q) 6.00 .... u :c ::3 0 -:r: 0 :;: .... ::3 0 4.00 2.00--i---.-~-t-~~~-t-~--\-~-t-~~~-+--~~~-+----'--~-+-~~~~ o.oo..-~~~ ..... ~~~-+-~~~-+~~~---t---~~~+-~~~+-~~~~ 0 10 20 30 40 50 60 70 Time (Minutes) --Pre-Development Hydrograph -Total Post-Development Hydrograph Page 42 Detention Pond Storage Volumes as Percent of Maximum Volume 803-+------------------1 703 -+-------------,,.,,,,,.,.,,.,,,.,==----I 11111111111111111111111 Cl> E :s 0 603 __,__ _____ _. > E :s E -~ 503 --1-------~ ~ 11111111111111111111111 c ~ 403 ... cu ll. 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 1.91 2.29 2.55 2.91 Storm Elevation 311.20 311.58 311.84 312.20 Storm Volume 5185 6507 7439 8683 Maximum Capacity 10613 10613 10613 10613 Percent of Capacity 493 613 703 823 Page 43 50-year 100-year 50-ear 100-ear 3.30 3.45 312.59 312.74 10050 10580 10613 10613 953 1003