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HomeMy WebLinkAboutWPO200302301 Stormwater Mgmt Facility 1 - Calculations 2004-05-03 (1) HYDROLOGIC/HYDRAULIC CALCULATIONS • FOR. 1-1-acd'ew4e. prgeystetptee ate 4V -1 HOLLYMEAD TOWNCENTER SWM1 Rational Method Comparison L4 ) �eq /ypP pert P.s�teci t1 o May 3, 2004 LOCATION: �`� Tax Map 36 Parcels 41 D ,weop t�,r.:,41, ,,�' 0- t- e , Albemarle County,Virginia PREPARED BY: Rivanna Engineering &Surveying, PLC P.O. Box 7603 Charlottesville, VA 22906 P: 434.984.1599 F: 434.984.8863 INDEX Summary: 2 Pre-Development: , Flood Hydrographs: 3-11 Combined Hydrographs: 12-14 Post-Development: Flood Hydrographs: 15-26 Routed Hydrographs: 27-29 Combined Hydrographs: 30-32 Outlet Structures: 33-42 Reservoir: 43 NOTE: Critical Duration Calculations & DA Maps are at the end of this report. Run—off Summary Point of Pre-Dev Pre-Dev Pre-Dev Post - Post-Dev Post-Dev Analysis DA 2-Year 10-Year Dev 2-Year 10-Year DA 1 B & C 17 36- 24 68 Z (Rtd. ) , J O" W,X, & Y t HOLLYMEAD TOWN CENTER—SWM1 SUMMARY • These calculations have been submitted for comparison purposes only. Please refer to the calculations using the TR-55 Method for descriptions of the drainage areas and outlet structure. During the 2yr storm event the pond will attain a water surface elevation of 521.62 and the outlet structure will have a total outflow of 27.46cfs. Of the total outflow 25.56cfs will go to the 18"D.I.P. supplying the flow to the Forest Lakes pond and 1.90cfs will flow to the 36"RCP pipe to the Gateway Pond. During the 10yr storm event the pond will attain a water surface elevation of 522.62 and the outlet structure will have a total outflow of 29.07cfs. Of the total outflow 26.54cfs will go to the 18"D.I.P. supplying the flow to the Forest Lakes pond and 2.53cfs will flow to the 36"RCP pipe to the Gateway Pond. Rivanna Engineering&Surveying,PLC Page. 2 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-A, 2yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 21.01 (cfs) Time to Peak (Tp) = 17.68 (min) Time of Base (Tb) = 35.36 (min) Volume = 0.5115 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.5115 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 19.5000 NA 0.35 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 17.68 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.90 (in) Return Period = 2 (yr) Storm Duration = 0.29 (hr) Rivanna Engineering&Surveying,PLC Page 3 (434)984-1599 • HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-A, l0yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 29.89 (cfs) Time to Peak (Tp) = 17.68 (min) Time of Base (Tb) = 35.36 (min) Volume = 0.7276 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.7276 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 19.5000 NA 0.35 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 17.68 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.28 (in) Return Period = User Defined (yr) Storm Duration = 0.29 (hr) Rivanna Engineering&Surveying,PLC Page 4 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-A, 100yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 43.35 (cfs) Time to Peak (Tp) = 17.68 (min) Time of Base (Tb) = 35.36 (min) Volume = 1.0554 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 1.0554 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 19.5000 NA 0.35 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 17.68 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.86 (in) Return Period = 100 (yr) Storm Duration = 0.29 (hr) Rivanna Engineering&Surveying,PLC Page 5 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-B, 2yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 17.87 (cfs) Time to Peak (Tp) = 17.50 (min) Time of Base (Tb) = 35.00 (min) Volume = 0.4304 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.4304 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 16.4900 NA 0.35 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 17.50 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.90 (in) Return Period = 2 (yr) Storm Duration = 0.29 (hr) Rivanna Engineering&Surveying,PLC Page 6 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-B, l0yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 25.41 (cfs) Time to Peak (Tp) = 17.50 (min) Time of Base (Tb) = 35.00 (min) Volume = 0.6119 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.6119 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 16.4900 NA 0.35 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 17.50 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.27 (in) Return Period = User Defined (yr) Storm Duration = 0.29 (hr) Rivanna Engineering&Surveying,PLC Page 7 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-B, 100yr V Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 36.84 (cfs) Time to Peak (Tp) = 17.50 (min) Time of Base (Tb) = 35.00 (min) Volume = 0.8872 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.8872 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 16.4900 NA 0.35 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 17.50 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.85 (in) Return Period = 100 (yr) Storm Duration = 0.29 (hr) Rivanna Engineering&Surveying,PLC Page 8 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-C, 2yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 2.04 (cfs) Time to Peak (Tp) = 6.00 (min) Time of Base (Tb) = 12.00 (min) Volume = 0.0168 (ac-ft) Time Step = 1•.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0168 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.7200 NA 0.55 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 6.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.51 (in) Return Period = 2 (yr) Storm Duration = 0.10 (hr) Rivanna Engineering&Surveying,PLC Page 9 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-C, l0yr" Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 2.69 (cfs) Time to Peak (Tp) = 6.00 (min) Time of Base (Tb) = 12.00 (min) Volume = 0.0222 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0222 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.7200 NA 0.55 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 6.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation 0.67 (in) Return Period = User Defined (yr) Storm Duration = 0.10 (hr) Rivanna Engineering&Surveying,PLC Page 10 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-C, 100yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 3.74 (cfs) Time to Peak (Tp) = 6.00 (min) Time of Base (Tb) = 12.00 (min) Volume = 0.0309 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0309 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.7200 NA 0.55 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 6.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.94 (in) Return Period = 100 (yr) Storm Duration = 0.10 (hr) Rivanna Engineering&Surveying,PLC Page 11 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-B&C, 2yr Type: Combined [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 17.36 (cfs) Time to Peak (Tp) = 17.00 (min) Time of Base (Tb) = 34.00 (min) Volume = 0.4473 (ac-ft) Time Step = 1.00 (min) [COMBINED HYDROGRAPH RECORDS] Name: DA-B, 2yr Type: Modified Rational Peak Flow (Qp) = 17.87 (cfs) Time to Peak (Tp) = 17.50 (min) Time Step = 1.00 (min) Name: DA-C, 2yr Type: Modified Rational Peak Flow (Qp) = 2.04 (cfs) Time to Peak (Tp) = 6.00 (min) Time Step = 1.00 (min) Rivanna Engineering&Surveying,PLC Page 12 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-B&C, l0yr Type: Combined [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 24.68 (cfs) Time to Peak (Tp) = 18.00 (min) Time of Base (Tb) = 34.00 (min) Volume = 0.6341 (ac-ft) Time Step = 1.00 (min) [COMBINED HYDROGRAPH RECORDS] Name: DA-B, l0yr Type: Modified Rational Peak Flow (Qp) = 25.41 (cfs) Time to Peak (Tp) = 17.50 (min) Time Step = 1.00 (min) Name: DA-C, l0yr Type: Modified Rational Peak Flow (Qp) = 2.69 (cfs) Time to Peak (Tp) = 6.00 (min) Time Step = 1.00 (min) Rivanna Engineering&Surveying,PLC Page 13 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Pre-Development Flood Hydrographs Name: DA-B&C, 100yr Type: Combined [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 35.79 (cfs) Time to Peak (Tp) = 17.00 (min) Time of Base (Tb) = 34.00 (min) Volume = 0.9181 (ac-ft) Time Step = 1.00 (min) [COMBINED HYDROGRAPH RECORDS] Name: DA-B, 100yr Type: Modified Rational Peak Flow (Qp) = 36.84 (cfs) Time to Peak (Tp) = 17.50 (min) Time Step = 1.00 (min) Name: DA-C, 100yr Type: Modified Rational Peak Flow (Qp) = 3.74 (cfs) Time to Peak (Tp) = 6.00 (min) Time Step = 1.00 (min) Rivanna Engineering&Surveying,PLC Page 14 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Z, 2yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 40.38 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 56.00 (min) Volume = 2.5588 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 2.5588 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 28.0000 NA 0.85 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 10.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.29 (in) Return Period = 2 (yr) Storm Duration = 0.77 (hr) Rivanna Engineering&Surveying,PLC Page 15 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Z, l0yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 69.48 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 46.10 (min) Volume = 3.4550 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow 0.00 (cfs) Maximum Storage = 3.4550 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 28.0000 NA 0.85 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 10.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.74 (in) Return Period = User Defined (yr) Storm Duration = 0.60 (hr) Rivanna Engineering&Surveying,PLC Page 16 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Z, 100yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (gp) = 120.68 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 37.30 (min) Volume = 4.5379 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 4.5379 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 28.0000 NA 0.85 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 10.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 2.29 (in) Return Period = 100 (yr) Storm Duration = 0.46 (hr) Rivanna Engineering&Surveying,PLC Page 17 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-W, 2yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 2.97 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 10.00 (min) Volume = 0.0204 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0204 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.6000 NA 0.90 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.45 (in) Return Period = 2 (yr) Storm Duration = 0.08 (hr) Rivanna Engineering&Surveying,PLC Page 18 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs • Name:. DA-W, l0yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 3.86 (cfs) Time to Peak (Tp) 5.00 (min) Time of Base (Tb) = 10.00 (min) Volume = 0.0266 (ac-ft) , Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) ' Maximum Storage = 0.0266 (Cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation. 0.6000 NA 0.90 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.59 (in) Return Period = User Defined (yr) Storm Duration = 0.08 (hr) Rivanna Engineering&Surveying,PLC Page 19 (434)984-1599. HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-W, 100yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 5.33 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 10.00 (min) Volume = 0.0367 (ac-ft) Time,Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0367, (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.6000 NA 0.90 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) 5.0.0 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation 0.82 (in) , Return Period 100 (yr) Storm Duration = 0.08 (hr) Rivanna Engineering&Surveying,PLC Page 20 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Hood Hydrographs Name: DA-X, 2yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.09 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 10.00 (min) Volume = 0.0075 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0075 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.2200 NA 0.90 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.45 (in) Return Period = 2 (yr) Storm Duration = 0.08 (hr) Rivanna Engineering&Surveying,PLC Page 21 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-X, l0yr Type: - Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) . = 1.42 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 10.00 (min) Volume • = 0.0098 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0098 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.2200 NA 0.90 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.59 (in) Return Period = User Defined (yr) Storm Duration = 0.08 (hr) Rivanna Engineering&Surveying,PLC Page 22 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-X, 100yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.96 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 10.00 (min) Volume = 0.0135 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0135 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.2200 NA 0.90 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.82 (in) Return Period = 100 (yr) Storm Duration = • 0.08 (hr) Rivanna Engineering&Surveying,PLC Page 23 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Y, 2yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 0.94 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 10.00 (min) Volume = 0.0065 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 - Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) . Maximum Storage 0.0065 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.1900 NA 0.90 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.45 (in) Return Period = 2 (yr) Storm Duration = 0.08 (hr) Rivanna Engineering&Surveying,PLC Page 24 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Y, l0yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.22 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 10.00 (min) Volume = 0.0084 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0084 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.1900 NA 0.90 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.59 (in) Return Period = User Defined (yr) Storm Duration = 0.08 (hr) Rivanna Engineering&Surveying,PLC Page 25 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Y, 100yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.69 (cfs) Time to Peak (Tp) = 5.00 (min) Time of Base (Tb) = 10.00 (min) Volume = 0.0116 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.00 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.0116 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.1900 NA 0.90 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.82 (in) Return Period = 100 (yr) Storm Duration = 0.08 (hr) Rivanna Engineering&Surveying,PLC Page 26 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Z, Rtd. 2yr Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION], (Includes flow to 18" DIP to Forest Lakes Pond) Peak Flow (Qp) = 27.46 (cfs) Time to Peak (Tp) = 49.00 (min) Time of Base (Tb) = 1017.00 (min) Volume = 2.3736 (ac-ft) Time Step = 1.00 (min) ' Peak Elevation = 521.6227 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Name = SWM1 - Pond Storage Type = User-Defined Area Maximum Storage = 319287.6250 (cu ft) Maximum Discharge = 115.81 (cfs) [INFLOW HYDROGRAPH INFORMATION] Name = DA-Z, 2yr Peak Flow (Qp) = 40.38 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 56.00 (min) Volume = 2.5588 (ac-ft) Flow Multiplier = 1.00 Rivanna Engineering&Surveying,PLC Page 27 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Z, Rtd. l0yr Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION], (Includes flow to 18" DIP to Forest Lakes Pond) Peak Flow (Qp) = 29.07 (cfs) Time to Peak (Tp) = 42.00 (min) Time of Base (Tb) = 1030.00 (min) Volume = 3.2698 (ac-ft) Time Step = 1.00 (min) Peak Elevation = 522.6186 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Name = SWM1 - Pond Storage Type = User-Defined Area Maximum Storage = 319287.6250 (cu ft) Maximum Discharge = 115.81 (cfs) [INFLOW HYDROGRAPH INFORMATION] Name = DA-Z, l0yr Peak Flow (Qp) = 69.48 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 46.10 (min) Volume = 3.4550 (ac-ft) Flow Multiplier = 1.00 Rivanna Engineering&Surveying,PLC Page 28 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Z, Rtd. 100yr Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION], (Includes flow to 18" DIP to Forest Lakes Pond) Peak Flow (Qp) = 32.17 (cfs) Time to Peak (Tp) = 35.00 (min) Time of Base (Tb) = 1050.00 (min) Volume = 4.3527 (ac-ft) Time Step = 1.00 (min) Peak Elevation = 523.8849 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Name = SWM1 - Pond Storage Type = User-Defined Area Maximum Storage = 319287.6250 (cu ft) Maximum Discharge = 115.81 (cfs) [INFLOW HYDROGRAPH INFORMATION] Name = DA-Z, 100yr Peak Flow (Qp) = 120.68 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 37.30 (min) Volume = 4.5379 (ac-ft) Flow Multiplier = 1.00 Rivanna Engineering&Surveying,PLC Page 29 (434)984-1599 HOLLYMEAD TOWN CENTER"—SWM1 Post-Development Flood Hydrographs Name: DA-Z Rtd., W, X, & Y (2yr) Type: Combined. . [HYDROGRAPH INFORMATION] Peak Flow (Qp) = , 27.46 (cfs) Time to Peak (Tp) = 49.00 (min) Time of Base (Tb) = 1017.00 (min) Volume = 2.4080 (ac-ft) Time Step = 1.00 (min) [COMBINED HYDROGRAPH RECORDS] Name: DA-W, 2yr Type: Modified Rational Peak Flow (Qp) = 2.97 (cfs) • Time to Peak (Tp) = 5.00 (min) Time Step = .1.00 (min) Name: DA-X, 2yr " Type: Modified Rational Peak Flow (Qp) = 1.09 (cfs) Time to Peak (Tp) = 5.00 (min) Time Step = 1.00 (min) Name: DA-Y, 2yr Type: Modified Rational Peak Flow (Qp) = 0.94 (cfs) Time to Peak (Tp) = • 5.00 (min) Time Step = . 1.00 (min) Name: DA-Z, Rtd. 2yr . ' Type: Reservoir: Modified Puls Peak Flow (Qp) 27.4.6 (cfs) Time to Peak (Tp) • = 49.00 (min) Time Step = 1.00 (min) Rivanna Engineering&Surveying,PLC Page 30 (434)984-1599 • HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Z Rtd., W, X, & Y (l0yr) Type: Combined [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 29.07 (cfs) Time to Peak (Tp) = 42.00 (min) Time of Base (Tb) = 1030.00 (min) Volume = 3.3146 (ac-ft) Time Step = 1.00 (min) [COMBINED HYDROGRAPH RECORDS] Name: DA-W, l0yr Type: Modified Rational Peak Flow (Qp) = 3.86 (cfs) Time to Peak (Tp) = 5.00 (min) Time Step = 1.00 (min) Name: DA-X, l0yr Type: Modified Rational Peak Flow (Qp) = 1.42 (cfs) Time to Peak (Tp) = 5.00 (min) Time Step = 1.00 (min) Name: DA-Y, 10yr Type: Modified Rational Peak Flow (Qp) = 1.22 (cfs) Time to Peak (Tp) = 5.00 (min) Time Step = 1.00 (min) Name: DA-Z, Rtd. l0yr Type: Reservoir: Modified Puls Peak Flow (Qp) = 29.07 (cfs) Time to Peak (Tp) = 42.00 (min) Time Step = 1.00 (min) Rivanna Engineering&Surveying,PLC Page 31 (434)984-1599 • HOLLYMEAD TOWN CENTER—SWM1 Post-Development Flood Hydrographs Name: DA-Z Rtd., W, X, & Y (100yr) Type: Combined [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 32.17 (cfs),, Time to Peak (Tp) = 35.00 (min) Time of Base (Tb) = 1050.00 (min) Volume = 4.4145 (ac-ft). Time Step = 1.00 (min) [COMBINED HYDROGRAPH RECORDS] Name: DA-W, 100yr Type: Modified Rational Peak Flow (Qp) = 5.33 (cfs) Time to Peak (Tp) = 5.00 (min) Time Step = 1.00 (min) Name: DA-X, 100yr Type: Modified Rational . Peak Flow (Qp) = 1.96 (cfs) Time to Peak (Tp) = 5.00 (min) Time Step = 1.00 (min) Name: DA-Y, 100yr Type: Modified Rational Peak Flow (Qp) = 1.69 (cfs) Time to Peak (Tp) = 5.00 (min) Time Step = 1.00 (min) Name: DA-Z, Rtd. 100yr Type: Reservoir: Modified Puls Peak Flow (Qp) = 32.17 (cfs) Time to Peak (Tp) = 35.00 (min) Time Step = 1.00 (min) Rivanna Engineering&Surveying,PLC Page 32 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Outlet Structure Report Type : Stand Pipe Name : SWM1 - Outlet Structure [RATING CURVE LIMIT] Minimum Elevation = 511.0000 (ft) Maximum Elevation = 527.5000 (ft) Elevation Increment = 0.2500 (ft) [STAND PIPE INFORMATION] [ORIFICE INFORMATION] Diameter = 4.00 (ft) Crest Length = 12.57 (ft) Effective Crest Length = 8.57 (ft) Orifice Coefficient = 0.60 Fractional Open Area = 0.83 [ORIFICE EQUATION] Q = Co*A((2gh)/k)^0.5 [DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (sq ft) [WEIR INFORMATION] Crest Elevation = 525.5000 (ft) Weir Coefficient = 3.33 Exponential = 1.50 [WEIR EQUATION] Q = Cw * L * H^exp [DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert ft L = Crest lenght ft Rivanna Engineering&Surveying,PLC Page 33 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Outlet Structure Report [OPTIONAL WEIR INFORMATION] Type : Rectangular Weir Suppressed [WEIR INFORMATION] Crest Length = 4.00 (ft) Crest Elevation = 523.7500 (ft) Weir Coefficient = .3.33 Exponential = 1.50 [RECTANGULAR SUPRESSED EQUATION] Q = Cw * L * H^exp [DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert = Crest lenght Rivanna Engineering&Surveying,PLC Page 34 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Outlet Structure Report [OPTIONAL ORIFICE INFORMATION] Type : Circular Orifice [OPTIONAL ORIFICE INFORMATION] Diameter = 0.67 (ft) Invert Elevation = 520.0000 (ft) Orifice Coefficient = 0.60 Number of Openings = 1 [ORIFICE EQUATION] Q = Co*A((2gh)/k)^0.5 [DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (cfs) k = 1 Rivanna Engineering&Surveying,PLC Page 35 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Outlet Structure Report [CULVERT INFORMATION] Type : Circular Concrete —Square Edge with Headwall [OUTLET STRUCTURE INFORMATION] Diameter = 36.00 (in) Invert Elevation = 519.0000 (ft) Pipe Length = 180.00 (ft) Slope = 0.01 Manning's n Value = 0.01 Orifice Coefficient = 0.60 Tailwater Elevation = 520.5000 (ft) Number of Barrels = 1 [UNSUBMERGED EQUATION] H/Diam = Hc/Diam+K*(Q/(A*Diam^0.5) )AM-0.5*S Coefficient K = 0.01 Coefficient M = 2.00 Q Maximum = 42.85 [SUBMERGED EQUATION] H/Diam = c*(Q/(A*Diam^0.5))^2+Y-0.5*S Coefficient c = 0.04 Coefficient Y = 0.67 Q Minimum = 48.97 [DEFINITIONS] H = Headwater depth above inlet control section invert, (ft) Diam = Interior height of culvert barrel, (ft) He = Specific head at critical depth (dc+VcA2/2g), (ft) Q = Discharge, (cfs) A = Full cross sectional area of culvert barrel, (sq ft) S = Culvert barrel slope, (ft/ft) Rivanna Engineering&Surveying,PLC Page 36 (434)984-1599 HOLLYMEAD TOWN CENTER-SWM1 Outlet Structure Report [STAND PIPE STAGE VS. DISCHARGE] Elevation Stage Weirs Orifices Stand Pipe Culvert Total (ft) (ft) (cfs) (cfs) (cfs) (cfs) (cfs) 520.0000 9.0000 0.00 0.00 0.00 5.57 0.00 520.2500 9.2500 0.00 0.20 0.00 8.37 0.20 520.5000 9.5000 0.00 0.68 0.00 11.63 0.68 520.7500 9.7500 0.00 1.08 0.00 15.23 1.08 521.0000 10.0000 0.00 1.37 0.00 , 19.00 1.37 521.2500 10.2500 0.00 1.61 0.00 22.93 1.61 521.5000 10.5000 0.00 1.81. 0.00 27.03 1.81 521.7500 10.7500 0.00 2.00 '0.00 31.13 2.00 522.0000 11.0000 0.00 2.17 0.00 35.15 2.17 522.2500 11.2500 0.00 2.33 0.00 39.25 2.33 522.5000 11.5000 0.00 2.47 0.00 42.85 2.47 522.7500 11.7500 0.00 2.61 0.00 46.95 2.61 523.0000 12.0000 0.00 2.74 0.00 50.08 2.74 523.2500 12.2500 0.00 2.87 0.00 52.61 2.87 523.5000 12.5000 0.00 2.99 0.00 54.95 2.99 523.7500 12.7500 0.00 3.11 0.00 57.19 3.11 524.0000 13.0000 1.67 3.22 0.00 59.36 4.88 524.2500 13.2500 4.71 3.32 0.00 61.47 8.03 524.5000 13.5000 8.65 3.43 0.00 63.51 12.08 524.7500 13.7500 13.32 3.53 0.00 65.47 16.85 525.0000 14.0000 18.62 3.63 0.00 67.41 22.24 525.2500 14.2500 24.47 3.73 0.00 69.33 28.20 525.5000 14.5000 30.84 3.82 0.00 71.22 34.66 525.7500 14.7500 37.67 3.91 3.57 73.06 45.15 526.0000 15.0000 44.95 4.00 10.09 74.86 59.04 526.2500 15.2500 52.65 4.09 18.53 76.63 75.27 526.5000 15.5000 60.74 4.17 28.53 78.35 78.35 526.7500 15.7500 69.21 4.26 39.87 80.05 80.05 527.0000 16.0000 78.04 4.34 50.96 81.71 81.71 527.2500 16.2500 87.22 4.42 59.95 83.35 83.35 527.5000 16.5000 96.73 4.50 68.95 84.96 84.96 Rivanna Engineering&Surveying,PLC Page 37 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Outlet Structure Report OUTLET STRUCTURE REPORT Type : Stand Pipe Name : SWM1 - Forest Lakes Pipe [RATING CURVE LIMIT] Minimum Elevation = 511.0000 (ft) Maximum Elevation = 528.0000 (ft) Elevation Increment = 0.2500 (ft) [STAND PIPE INFORMATION] [ORIFICE INFORMATION] Diameter = 1.30 (ft) Crest Length = 4.08 (ft) Effective Crest Length = 1.08 (ft) Orifice Coefficient = 0.60 Fractional Open Area = 1.00 [ORIFICE EQUATION] Q = Co*A((2gh)/k)^0.5 [DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (sq ft) [WEIR INFORMATION] Crest Elevation = 524.6000 (ft) Weir Coefficient = 3.33 Exponential = 1.50 [WEIR EQUATION] Q = Cw * L * H^exp [DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert ft L = Crest lenght ft Rivanna Engineering&Surveying,PLC Page 38 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Outlet Structure Report [OPTIONAL WEIR INFORMATION] Type : Rectangular Weir Suppressed [WEIR INFORMATION] Crest Length = 3.00 (ft) Crest Elevation = 520.0000 (ft) Weir Coefficient 3.33 Exponential = 1.50 [RECTANGULAR SUPRESSED EQUATION] Q = Cw * L * HAexp [DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert L = Crest lenght Rivanna Engineering&Surveying,PLC Page 39 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Outlet Structure Report [OPTIONAL ORIFICE INFORMATION] Type : Rectangular Orifice [OPTIONAL ORIFICE INFORMATION] Height = 1.50 (ft) Width = 1.50 (ft) Invert Elevation = 520.0000 (ft) Orifice Coefficient = 0.60 Number of Openings = 1 [ORIFICE EQUATION] Q = Co*A( (2gh)/k)^0.5 [DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (cfs) k = 1 Rivanna Engineering&Surveying,PLC Page 40 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 Outlet Structure Report [CULVERT INFORMATION] Type : Circular Concrete - Square Edge with Headwall [OUTLET STRUCTURE INFORMATION] Diameter = 18.00 (in) Invert Elevation = 511.5900 (ft) Pipe Length = 130.00 (ft) Slope = 0.03 Manning's n Value = 0.01 Orifice Coefficient = 0.60 Tailwater Elevation = 507.9700 (ft) Number of Barrels = 1 [UNSUBMERGED EQUATION] H/Diam = Hc/Diam+K*(Q/(A*Diam^0.5) )^M-0.5*S Coefficient K = 0.01 Coefficient M = 2.00 Q Maximum 7.58 [SUBMERGED EQUATION] H/Diam = c*(Q/(A*Diam^0.5) )^2+Y-0.5*S Coefficient c = 0.04 Coefficient Y = 0.67 Q Minimum = 8.66 [DEFINITIONS] H = Headwater depth above inlet control section invert, (ft) Diam = Interior height of culvert barrel, (ft) He = Specific head at critical depth (dc+VcA2/2g) , (ft) Q = Discharge, (cfs) A = Full cross sectional area of culvert barrel, (sq ft) S = Culvert barrel slope, (ft/ft) Rivanna Engineering&Surveying,PLC Page 41 (434)984-1599 HOLLYMEAD TOWN CENTER-SWM1 Outlet Structure Report [STAND PIPE STAGE VS. DISCHARGE] Elevation Stage Weirs Orifices Stand Pipe Culvert Total (ft) (ft) (cfs) (cfs) (cfs) (cfs) (cfs) 520.0000 9.0000 0.00 0.00 0.00 23.90 0.00 520.2500 9.2500 1.25 0.64 0.00 24.16 1.89 520.5000 9.5000 3.53 1.80 0.00 24.42 5.34 520.7500 9.7500 6.49 3.32 0.00 24.68 9.80 521.0000 10.0000 9.99 5.10 0.00 24.94 15.09 521.2500 10.2500 13.96 7.13 0.00 25.19 21.10 521.5000 10.5000 18.35 9.38 0.00 25.44 25.44 521.6200* 10.6200 20.64 10.08 0.00 25.56 25.56 521.7500 10.7500 23.13 10.83 0.00 25.69 25.69 522.0000 11.0000 28.26 12.11 0.00 25.94 25.94 522.2500 11.2500 33.72 13.26 0.00 26.18 26.18 522.5000 11.5000 39.49 14.33 0.00 26.42 26.42 522.6200** 11.6200 42.40 14.80 0.00 26.54 26.54 522.7500 11.7500 45.56 15.31 0.00 26.66 26.66 523.0000 12.0000 51.91 16.24 0.00 26.90 26.90 523.2500 12.2500 58.53 17.12 0.00 27.14 27.14 523.5000 12.5000 65.41 17.96 0.00 27.37 27.37 523.7500 12.7500 72.55 18.76 0.00 27.60 27.60 523.8800*** 12.8800 76.38 19.16 0.00 27.72 27.72 524.0000 13.0000 79.92 19.52 0.00 27.83 27.83 524.2500 13.2500 87.53 20.26 0.00 28.06 28.06 524.5000 13.5000 95.36 20.97 0.00 28.28 28.28 524.7500 13.7500 103.42 21.66 0.21 28.51 28.51 525.0000 14.0000 111.69 22.33 0.91 28.73 28.73 , 525.2500 14.2500 120.17 22.97 1.89 28.95 28.95 525.5000 14.5000 128.86 23.60 3.08 29.17 29.17 525.7500 14.7500 137.74 24.22 4.45 29.39 29.39 526.0000 15.0000 146.82 24.81 5.98 29.60 29.60 526.2500 15.2500 156.09 25.40 7.15 29.82 29.82 526.5000 15.5000 165.55 25.97 8.30 30.03 30.03 526.7500 15.7500 175.19 26.53 9.37 30.24 30.24 527.0000 16.0000 185.02 27.07 9.90 30.45 30.45 527.2500 16.2500 195.02 27.61 10.40 30.66 30.66 527.5000 16.5000 205.19 28.14 10.88 30.86 30.86 527.7500 16.7500 215.54 28.65 11.34 31.07 31.07 528.0000 17.0000 226.05 29.16 11.78 31.27 31.27 * Water Surface elevation obtained during 2yr storm event. ** Water Surface elevation obtained during l0yr storm event. *** Water Surface elevation obtained during 100yr storm event. Rivanna Engineering&Surveying,PLC Page 42 (434)984-1599 HOLLYMEAD TOWN CENTER-SWM1 Outlet Structure Report Name: SWM1 - Pond [RATING CURVE LIMIT] Minimum Elevation = 511.0000 (ft) Maximum Elevation = 527.5000 (ft) Elevation Increment = 0.5000 (ft) [STAGE STORAGE INFORMATION] Storage Method: User-Defined Storage Input Method: Area Number Elevation Area Ave Area Volume Cumulative Volume (ft) (sq ft) (sq ft) (cu ft) (cu ft) 1 519.9000 0.0000 0.0000 0.0000 0.0000 2 520.0000 32269.0000 16134.5000 1613.4500 1613.4500 3 522.0000 37079.0000 34674.0000 69348.0000 70961.4500 4 524.0000 42135.0000 39607.0000 79214.0000 150175.4500 5 525.0000 44748.0000 43441.5000 43441.5000 193616.9500 6 526.0000 47094.5000 45921.2500 45921.2500 239538.2000 7 527.5000 50633.0000 48863.7500 73295.6250 312833.8250 [DISCHARGE INFORMATION] Structure Number: 1 Type: Name: SWM1 - Outlet Structure Structure Number: 2 Type: Name: SWM1 - Forest Lakes Pipe [RESERVOIR STAGE STORAGE/DISCHARGE] ' Elevation Stage Area Storage Discharge (ft) (ft) (sq ft) (cu ft) (cfs) 519.5000 8.5000 0.0000 0.0000 0.00 520.0000 9.0000 32269.0000 8067.2500 0.00 520.5000 9.5000 33471.5000 24502.3750 6.01 521.0000 10.0000 34674.0000 41538.7500 16.47 521.5000 10.5000 35876.5000 59176.3750 27.26 522.0000 11.0000 37079.0000 77415.2500 28.11 522.5000 11.5000 38343.0000 96270.7500 28.90 523.0000 12.0000 39607.0000 115758.2500 29.64 ' 523.5000 12.5000 40871.0000 135877.7500 30.36 524.0000 13.0000 42135.0000 156629.2500 32.71 524.5000 13.5000 43441.5000 178023.3750 40.36 525.0000 14.0000 44748.0000 200070.7500 50.97 525.5000 14.5000 45921.2500 222738.0625 63.82 526.0000 15.0000 47094.5000 245992.0000 88.64 526.5000 15.5000 48274.0000 269834.1250 108.37 527.0000 16.0000 49453.5000 294266.0000 112.15 527.5000 16.5000 50633.0000 319287.6250 115.81 Maximum Storage = 319287.6250 (cu ft) Maximum Discharge = 115.81 (cfs) Rivanna Engineering&Surveying,PLC Page 43 (434)984-1599 -ryoN 551\ a� uo� ?�10c^a1, .Xt Cr u v \ W, Lt 'tQTE " C't7 - Iss! �- /L, - '31)`to •°)Q1 X4.2. 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