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Home My WebLink AboutWPO200302301 Stormwater Mgmt Facility 1 - Calculations 2004-05-03 (2) 1 HYDROLOGIC/HYDRAULIC CALCULATIONS FOR HOLLYMEAD TOWNCENTER SWM1 6t4 vtat-t' a< TR-55 Method aw s `,)/c.1"c' November 19, 2003 Rev: November 25, 2003 �tC(�� Rev: December 19, 2003 Rev: May 3; 2004 p LOCATION: teu ep, h J. eia° = Tax Map 36 Parcels 41 D 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: " 3-6 Combined Hydrographs: 7-8 Post-Development: Flood Hydrographs: 9-17 Routed Hydrographs: 18-20 Combined Hydrographs: 21-22 Outlet Structures: 23-32 Reservoir: 33-34 Temp. Sediment Basin Conditions: Routed Hydrographs: 35-37 Reservoir: 38-39 NOTE: 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 15. 8 41 Z(Rtd. ) , 6.�"4°�" 21.:,34" W,X,& Y j,, HOLLYMEAD TOWN CENTER—SWM1 SUMMARY Drainage Areas The point of analysis for Stormwater Management Facility#1 is the outfall of the existing 4'x4'box culvert that flows to the existing Gateway Pond. The drainage to this point has been defined with two separate drainage areas. Drainage Area'B'is the pre-development area that enters into the 4'x4'box culvert on the west side of Route 29. Drainage Area'C'is the pre-development area that enters into the 4'x4'box culvert from a DI-7 drop inlet located in the median of Route 29. Drainage Area'A'is the pre-development drainage area that flows to an existing 24"CMP culvert that ultimately flows to Pond A of the Forest Lakes Subdivision. The post-development drainage areas for Stormwater Management Facility#1 consist of four individual drainage areas. Drainage Area'Z'is the entire post-development drainage area that flows into SWM#1 which includes the Target and it's adjacent building,Timberwood Blvd.up to it's intersection with Meeting Street, (Ridge Rd.),and Blocks I, II,VI I,VI II,&IX of the proposed development areas for Virginia Land Co.on the preliminary site plan. Drainage AreasW, 'X',&'Y'are the uncontained areas that will flow to the curb inlets on the Route 29 frontage improvements. Outlet Structure&Routing The outlet structure for the pond will consist of a 5'diameter standpipe with two culverts. One of the culverts will be a 18"ductile iron pipe that will continue base flow through the existing 24"CMP to the Forest Lakes pond. The 18"D.I.P.will have an invert of 511.59. The second culvert will be 36"RCP with an invert of 516.00 and will flow to the existing 4'x4'box culvert that flows to the Gateway Pond located between Holly Memorial Gardens and the Gateway Townhouses at Forest Lakes. The standpipe rim is at an elevation of 525.50 and will have a 4'weir at an elevation of 523.75. In addition there will be an 8"orifice with an invert elevation of 520.00. During the 2yr storm event the pond will attain a water surface elevation of 523.16 and the outlet structure will have a total outflow of 29.87 cfs. Of the total outflow 27.05 cfs will go to the 18"D.I.P. supplying the flow to the Forest Lakes pond and 2.82 cfs will flow to the 36"RCP pipe resulting in a combined peak flow of 6.24 cfs going through the 4'x4'box culvert to the Gateway Pond. During the 10yr storm event the pond will attain a water surface elevation of 524.91 and the outlet structure will have a total outflow of 48.94 cfs. Of the total outflow 28.66 cfs will go to the 18"D.I.P. supplying the flow to the Forest Lakes pond and 20.32 cfs will flow to the 36"RCP pipe resulting in a combined peak flow of 21.34 cfs going through the 4'x4'box culvert to the Gateway Pond. While construction activities are taking place the pond will serve as a temporary sediment basin. During the construction phase the 18"DIP pipe that will provide flow to the Forest Lakes pond will be capped in order to prevent silt from entering the pond. The standpipe will be provided with a 15" dewatering orifice with an invert elevation of 516.5. The flows shown going to the sediment basin reflect full build-out conditions. Since the full volume of the pond can be used while the pond is being used as a sediment basin the flows to the 4'x4'box culvert will be reduced considerably. The flow calculations and pond volumes are provided in this report. Full build-out conditions were used because they represent the worst-case scenario for the total volume of flow that will be going to the sediment basin during construction. Rivanna Engineering&Surveying,PLC Page 2 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-B,2 year. Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow(Op) = 14.37(cfs) Time to Peak(Tp) • = 726.00(min) Time of Base(Tb) = 1496.73(min) Volume = 1.1866(ac-ft) Time Step = 2.00(min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow(Qp) = 64.13 (cfs) Time to Peak(Tp) = 11.67(min) Time of Base(Tb) = 58.33 (min) Volume = 1.3755(ac-ft) Shape Factor = 484.00 Time Step: = 2.00(min) Excess Rain = 1.00(in) Lag Time = 10.50(min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 16.4900 62 [TIME CONCENTRATION--User Defined] Time of Concentration (Tc) = 17.50(min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 4.00(in) Return Period = 2(yr) Storm Duration = 24.00(hr) Rivanna Engineering&Surveying,PLC Page 3 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-B,10 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow(Op) = 39.73(cfs) Time to Peak(Tp) = 724.00(min) Time of Base(Tb) = 1496.73(min) Volume = 2.8734(ac-ft) Time Step = 2.00(min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow(Qp) = 64.13(cfs) Time to Peak(Tp) = 11.67(min) Time of Base(Tb) = 58.33(min) Volume = 1.3755(ac-ft) Shape Factor = 484.00 Time Step: = 2.00(min) Excess Rain = 1.00(in) Lag Time = 10.50(min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 16.4900 62 [TIME CONCENTRATION--User Defined] Time of Concentration (Tc) = 17.50 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 6.00(in) Return Period = 2(yr) Storm Duration = 24.00(hr) Rivanna Engineering&Surveying,PLC Page 4 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-C,2 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow(Op) = 2.56(cfs) Time to Peak(Tp) = 718.00(min) Time of Base(Tb) = 1459.59(min) Volume = 0.1075(ac-ft) Time Step = 2.00(min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow(Qp) = 8.17(cfs) Time to Peak(Tp) = 4.00(min) Time of Base(Tb) = 20.00(min) Volume = 0.0597(ac-ft) Shape Factor = 484.00 Time Step: = 2.00(min) Excess Rain = 1.00(in) Lag Time = 3.60(min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 0.7200 80 [TIME CONCENTRATION--User Defined] Time of Concentration (Tc) = 6.00(min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 4.00(in) Return Period = 2 (yr) Storm Duration = 24.00(hr) Rivanna Engineering&Surveying,PLC Page 5 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-C,10 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow(Op) = 4.64(cfs) Time to Peak(Tp) = 718.00(min) Time of Base(Tb) = 1459.59(min) Volume = 0.2033 (ac-ft) Time Step = 2.00(min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow(Qp) = 8.17(cfs) Time to Peak(Tp) = 4.00(min) Time of Base(Tb) = 20.00(min) Volume = 0.0597(ac-ft) Shape Factor = 484.00 Time Step: = 2.00(min) Excess Rain = 1.00(in) Lag Time = 3.60(min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Overall Approximation 0.7200 80 [TIME CONCENTRATION--User Defined] Time of Concentration (Tc) = 6.00(min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 6.00(in) Return Period = 2 (yr) Storm Duration = 24.00(hr) Rivanna Engineering&Surveying,PLC Page 6 (434)984-1599 HOLLYMEAD TOWN CENTER-SWM1 FLOOD HYDROGRAPH REPORT Name: DA-B&DA C,2 year Type: Combined [HYDROGRAPH INFORMATION] Peak Flow(Qp) = 15.38(cfs) Time to Peak(Tp) = 724.00 (min) Time of Base(Tb) = 1478.00(min) Volume = 1.2941 (ac-ft) Time Step = 2.00(min) [COMBINED HYDROGRAPH RECORDS] Name: DA-B,2 year Type: Computed Flood Peak Flow(Qp) = 14.37(cfs) Time to Peak(Tp) = 726.00(min) Time Step = 2.00(min) Name: DA-C,2 year Type: Computed Flood Peak Flow(Qp) = 2.56(cfs) Time to Peak(Tp) = 718.00(min) Time Step = 2.00(min) Rivanna Engineering&Surveying,PLC Page 7 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-B&DA-C,10 year Type: Combined [HYDROGRAPH INFORMATION] Peak Flow(Op) = 41.55(cfs) Time to Peak(Tp) = 724.00(min) Time of Base(Tb) = 1484.00 (min) Volume = 3.0768 (ac-ft) Time Step = 2.00(min) [COMBINED HYDROGRAPH RECORDS] Name: DA-B, 10 year Type: Computed Flood Peak Flow(Qp) = 39.73 (cfs) Time to Peak(Tp) = 724.00 (min) Time Step = 2.00(min) Name: DA-C, 10 year Type: Computed Flood Peak Flow(Qp) = 4.64(cfs) Time to Peak(Tp) = 718.00(min) Time Step = 2.00(min) Rivanna Engineering&Surveying,PLC Page 8 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-W, 2 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 3.17 (cfs) Time to Peak (Tp) = 716.00 (min) Time of Base (Tb) = 1456.39 (min) Volume = 0.1338 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow (Qp) = 8.17 (cfs) Time to Peak (Tp) = 3.33 (min) Time of Base (Tb) 16.67 (min) Volume. = 0.0498 (ac-ft) Shape Factor = 484.00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 3.00 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN <None> Overall Approximation 0.6000 93 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 4.00 (in) Return Period = 2 (yr) Storm Duration = 24.00 (hr) Rivanna Engineering&Surveying,PLC Page 9 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-W, 10 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 4.96 (cfs) Time to Peak (Tp) = 716.00 (min) Time of Base (Tb) = 1456.39 (min) Volume = 0.2191 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow (Qp) = 8.17 (cfs) Time to Peak (Tp) = 3.33 (min) Time of Base (Tb) = 16.67 (min) Volume = 0.0498 (ac-ft) Shape Factor = 484.00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 3.00 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN <None> Overall Approximation 0.6000 93 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 6.00 (in) Return Period = 2 (yr) Storm Duration = 24.00 (hr) Rivanna Engineering&Surveying,PLC Page 10 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-W, 100 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 6.72 (cfs) Time to Peak (Tp) = 716.00 (min) Time of Base (Tb) = 1456.39 (min) Volume = 0.3055 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow (Qp) = 8.17 (cfs) Time to Peak (Tp) = 3.33 (min) Time of Base (Tb) = 16.67 (min) Volume = 0.0498 (ac-ft) Shape Factor = 484.00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 3.00 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN <None> Overall Approximation 0.6000 93 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 8.00 (in) Return Period = 2 (yr) Storm Duration = 24.00 (hr) Rivanna Engineering&Surveying,PLC Page 11 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-X, 2 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.16 (cfs) Time to Peak (Tp) = 716.00 (min) Time of Base (Tb) = 1456.39 (min) Volume = 0.0469 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow (Qp) = 2.99 (cfs) Time to Peak (Tp) = 3.33 (min) Time of Base (Tb) = 16.67 (min). Volume = 0.0183 (ac-ft) Shape Factor = 484.00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 3.00 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN <None> Overall Approximation 0.2200 93 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 4.00 (in) Return Period. = 2 (yr) Storm Duration = 24.00 (hr) Rivanna Engineering&Surveying,PLC Page 12 (434)984-1599 HOLLYMEAD TOWN CENTER-SWM1 FLOOD HYDROGRAPH REPORT Name: DA-X, 10 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.82 (cfs) Time to Peak (Tp) = 716.00 (min) Time of Base (Tb) = 1456.39 (min) Volume = 0.0781 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow (Qp) = 2.99 (cfs) Time to Peak (Tp) 3.33 (min) Time of Base (Tb) = 16.67 (min) Volume = 0.0183 (ac-ft) Shape Factor = 484.00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 3.00 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN <None> Overall Approximation 0.2200 93 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 6.00 (in) Return Period = 2 (yr) Storm Duration = 24.00 (hr) Rivanna Engineering&Surveying,PLC Page 13 (434)984-1599 HOLLYMEAD TOWN CENTER-SWM1 FLOOD HYDROGRAPH REPORT Name: DA-X, 100 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 2.46 (cfs) Time to Peak (Tp) = 716.00 (min) Time of Base (Tb) = 1456.39 (min) Volume = 0.1097 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Number = 3 Type = SCS Curvilinear Peak Flow (Qp) = 2.99 (cfs) Time to Peak (Tp) = 3.33, (min) Time of Base (Tb) = • 16.67 (min) Volume = 0.0183 (ac-ft) Shape Factor 484.00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 3.00 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN <None> Overall Approximation 0.2200 93 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation _. 8.00 (in) Return Period = . 2 (yr) Storm Duration • • = • 24.00 (hr) Rivanna Engineering&Surveying,PLC Page 14 (434)984-1599 • • . HOLLYMEAD TOWN CENTER-SWM1 FLOOD HYDROGRAPH REPORT , Name: DA-Y, 2 year: Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.00 (cfs). Time to Peak (Tp) = 716.00 (min) Time of Base (Tb) = 1456.39 (min) Volume = 0.0400 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow (Qp) = 2.59 (cfs) Time 'to,Peak (Tp) = 3.33 (min) Time of Base (Tb) = 16.67 (min) Volume = 0.0158 (ac-ft) Shape Factor = 484.00 Time Step: 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 3.00 (min) [BASIN INFORMATION] . [WEIGHTED WATERSHED AREA] Description Area CN <None> Overall Approximation 0.1900 93. [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = . SCS II Total Precipitation = 4.00 (in) Return Period = 2 (yr) Storm Duration = 24.00 (hr) Rivanna Engineering&Surveying,PLC Page 15 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1. FLOOD HYDROGRAPH REPORT Name: DA-Y, 10 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp)' = 1.57 (cfs) Time to Peak (Tp) = 716.00 (min) Time of Base (Tb) = 1456.39 (min) Volume = 0.0669 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow (Qp) = 2.59 (cfs) Time to Peak (Tp) = ' 3.33. (min) Time of. Base (Tb) = 16.67 (min) Volume = 0..0158 (ac-ft) Shape Factor = 484.00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 3.00 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN <None> Overall Approximation 0.1900 93 [TIME CONCENTRATION-- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 6.00 (in) Return Period = 2 (yr) Storm Duration = 24.00 (hr) Rivanna Engineering&Surveying,PLC Page 16 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-Y, 100 year Type: Computed Flood [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 2.13 (cfs) Time to Peak (Tp) = 716.00 (min) Time of Base (Tb) = 1456.39 (min) Volume = 0.0942 (ac-ft) Time Step = 2.00 (min) Flow Multiplier = 1.00 [UNIT HYDROGRAPH INFORMATION] Type = SCS Curvilinear Peak Flow (Qp) = 2.59 (cfs) Time to Peak (Tp) = 3.33 (min) Time of Base (Tb) = 16.67 (min) Volume = 0.0158 (ac-ft) Shape Factor = 484.00 Time Step: = 2.00 (min) Excess Rain = 1.00 (in) Lag Time = 3.00 (min) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN <None> Overall Approximation 0.1900 93 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 5.00 (min) [RAINFALL DESCRIPTION] Distribution Type = SCS II Total Precipitation = 8.00 (in) Return Period = 2 (yr) Storm Duration = 24.00 (hr) Rivanna Engineering&Surveying,PLC Page 17 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-Z Rtd: , 2 year Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] , (Includes flow to 18" D.I.P. to Forest Lakes Pond) Peak Flow (Qp) = 29.87. (cfs) Time to Peak (Tp) . = 732.00 (min) Time of Base (Tb) = 2296.00 (min) Volume = 7.3542 (ac-ft) Time Step - = 2.00 (min) Peak Elevation = 523.1590 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Name SWM1 - Pond Storage Type = User-Defined Area Maximum Storage = 319287.6250 (cu ft) Maximum Discharge = 133.33 (cfs) [INFLOW HYDROGRAPH INFORMATION] Name = DA-Z, 2 year Peak Flow (Qp) = 128.38 (cfs) Time.to Peak (Tp) = 720.00 (min) Time of Base (Tb) = 1472.39 (min) Volume 7.5394 (ac-ft) Flow Multiplier 1.00 Rivanna Engineering&Surveying,PLC Page 18 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name:' DA-Z Rtd. , 10 year Type:: Reservoir: Modified Puls_ [HYDROGRAPH INFORMATION] , (Includes flow to. 18" D.I.P. to Forest Lakes Pond) Peak Flow (Qp) - = 48.98 (cfs) Time to Peak (Tp) = 732.00 (min) Time. of Base (Tb) , , = 2316.00 (min) Volume = 11.9517 (ac-ft) Time Step = 2.00 (min) Peak Elevation = 524.9062 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] . Name SWM1 - Pond Storage Type = User-Defined Area Maximum Storage ' • ' = 319287.6250 (cu ft) Maximum Discharge 133.33 (cfs) [INFLOW HYDROGRAPH INFORMATION] Name = DA-Z, 10 year Peak Flow (Qp) = 200.43 (cfs) Time to Peak (Tp) = 720.00 (min) Time of Base (Tb) = 1472.39 (min) Volume = 12.1369 (ac-ft) Flow Multiplier = 1.00 Rivanna Engineering&Surveying,PLC ' ' • Page 19 (434)984-1599 HOLLYMEAD TOWN CENTER-SWM1 FLOOD HYDROGRAPH REPORT Name: DA-Z Rtd:, 100, year Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] , (Includes flow to 18" D.I.P. to Forest Lakes Pond) Peak Flow (Qp) = 97.93 (cfs) Time to Peak (Tp) = 728.00 (min) Time of Base (Tb) 2328.00 (min) Volume = 16.5897 (ac-ft) Time Step = 2.00 (min) Peak Elevation = 526.1333 (ft) 'Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Name = SWM1 - Pond Storage Type = User-Defined Area Maximum Storage = 319287.6250 (cu ft) Maximum Discharge = 133.33 (cfs) [INFLOW HYDROGRAPH INFORMATION] Name = DA-Z, 100 year Peak Flow (Qp) 271.66 (cfs) Time to Peak (Tp) = 720.00 (min) Time of Base (Tb) = 1472.39 (min) Volume = 16.7749 (ac-ft) Flow Multiplier = 1.00 Rivanna Engineering&Surveying,PLC Page 20 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-Z RTD. , DA-W, DA-X, & DA-Y (2year) - Type: Combined [HYDROGRAPH INFORMATION] , (Includes flow to 18" D.I.P. to Forest Lakes Pond) Peak Flow (Qp) = 37.05 (cfs) Time to Peak (Tp) = 718.00 (min) Time of. Base (Tb) = 2246.00 (min). Volume = 7.5749 (ac-ft) Time Step = 2.00 (min) [COMBINED HYDROGRAPH RECORDS] Name: DA-Z Rtd. , 2 year Type: Reservoir: Modified Puls Peak Flow. (Qp) = 29.87 (cfs) Time to Peak (Tp) = 732.00 (min) Time Step = 2.00 (min) Name: DA-W, 2 year Type: Computed Flood Peak Flow (Qp) = 3.17 (cfs) Time to Peak (Tp) = 716.00 (min) Time Step = 2.00 (min) Name: DA-X, 2 year Type:- Computed Flood Peak ;Flow (Qp) = 1.16 (cfs) Time to Peak (Tp) = 716.00 (min) Time Step = 2.00 (min) Name: DA-Y, 2 year Type: Computed Flood 'Peak Flow (Qp) = 1.00 (cfs) Time to Peak (Tp) 716.00 (min) Time Step = 2.00 (min) Rivanna Engineering&Surveying,PLC Page 21 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 FLOOD HYDROGRAPH REPORT Name: DA-Z RTD. , DA-W, DA-X, & DA-Y (10 year) Type: Combined [HYDROGRAPH INFORMATION] , (Includes flow to 18" D.I.P. to Forest Lakes Pond) Peak Flow (Qp) = 54.00 (cfs) Time to Peak (Tp) = 730.00 (min) Time of Base (Tb) = 2264.00 (min) Volume = 12.3159 (ac-ft) Time Step = 2.00 (min) [COMBINED HYDROGRAPH RECORDS] Name: DA-Z Rtd. , 10 year Type: Reservoir: Modified Puls Peak Flow (Qp) = 48.98 (cfs) Time to Peak (Tp) = 732.00 (min) Time Step = 2.00 (min) Name: DA-W, 10 year Type: Computed Flood Peak Flow (Qp) = 4.96 (cfs) Time to Peak (Tp) = 716.00 (min) Time Step = 2.00 (min) Name: DA-X, 10 year Type: Computed Flood Peak Flow (Qp) = 1.82 (cfs) Time to Peak (Tp) = 716.00 (min) Time Step = 2.00 (min) • Name: DA-Y, 10 year Type: Computed Flood Peak Flow (Qp) = 1.57 (cfs) Time to Peak (Tp) = 716.00 (min) Time Step = 2.00 (min) Rivanna Engineering&Surveying,PLC Page 22 (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 23 (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 = Headwater depth above inlet control section invert L = Crest lenght Rivanna Engineering&Surveying,PLC Page 24 (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 25 (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) 6i9 Invert Elevation = Q16.000Q(ft) Pipe Length = 180.00 (ft) Slope = 0.01 Manning's n Value = 0.01 Orifice Coefficient = 0.60 Tailwater Elevation = 517.9000 (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 = 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+Vc^2/2g) , (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 26 (434)984-1599 • �► 01cn01cnU] cncncncncncncncncn (xi Ut01cncn01cn (7cncr] cncncncr] cncnU] 01U] -- N al NJ NJ NJ NJ NJ NJ NJ NJ NJ N.) NJ IV NJ N..) ND NJ H H H H H H H H I-. H I-' H H H H I-' H hh H Cn 0) J J cn cn cn Cn .A .A (A W N N H H C) C) l0 l0 CO CO -.I J 01 GI Cn Cn .A .A W W NJ NJH rt (D H Cp = cnOu] ocnOcnocnocnocnocnOU] OU] ocnocnoU] ocno0ocnO01 ,. a I 0 CD CD CD 0 CD CD CD 0 CD CD 0 CD CD CD CD CD CD CD CD 0 0 CD CD 0 CD 0 0 CD CD CD CD CDrt C)0 CD 0 CD CD 0 0 0 0 0 0 0 0 0 CD0 0 0 0 0 0 0 0 0 0 0 0 CD CD CD CD CD CD H- i ; O CD CD CD CD CDO O CDO.O O CD CD O O 0 CD CD CDO CD CD CD CDO CD CD CD CDO CD CD0 H rs( IT/ . CCD =. N CDCD H H H H H H H H H H H H H H ID l0 CO O J J CA 6) 01 0n .A .A W (A N N H H CD — Cl) (J] CI) 01 U] (n .A .A W (....0 N.) NJ H H O O • Fi] rt H 7 cn CD ] CD W U] O U O in U1 O UI CD In O 01 CD01 rt W U] CD U] CD 01 O 01 CD U] CD In O 01 0 0 CD CD 0 0 0 CD CD CD CD 0 CD 0 CD 0 CD CD 0 0 —i0 0 CD CD CD o CD CD CD CD CD 0 CD CD 0 CD CD 0 0 CD CD 0 CD CD 0 CD CD CD CD CD 0 CD CD 0 CD (D C.1 Qo CD O"CD CD CD CD CD CD CD CD o CD 0 CD CD CD 0 0 0 CD CD 0 0 0 0 0 0 CD CD 0 0 0 CD a) CD CD 0 CD CD CD 0 0 CD 0 0 0 CD 0 < C Clfl J cm .A W'H co H 0 0 0 O O O O O O O O O O O 0 O O O O O O O 0 O O C1 01 CO O .A O Co • (] (D H H• U] r -t CD -• ] l0 OD 01 cn -I CD o CD CD 0 0 CD CD CD CD CD 0 CD CD CD CD CD 0 CD CD CD CD CD CD CD Cl)01010000000000000000000000000 hh Fi C) C I W .A .Cl. 01 .A N.) " WC 0 C'7 —I W Nv —I —I _ .A .A .A .A W W W W NJ NJ NJ ND H CD CD CD CD CD CD 0 0 0 CD 0 0 CD CD CD CD 0 CD CD 0 33 0 hi C 01 W H CD CO O> .A N l0 --I .A H Co W 01 CD CD CD CD CD CD CD CD CD 0 CD CD CD 0 CD CD CD CD HI H. CD .A -J C) N W Ca) NJ VD .A -] -1 H J CO CD CDCD CD C) CD CD CDCD CDCD C) C) CDCD CD CD CD COFes' 0 z n CO (n mZ mm xi 01 UI CO H CD CD CD CD 0 0 CD 0 0 CD CD CD CD 0 0 CD CD 0 CD CD 0 CD CD CD CD 0 CD 0 CD Cl) -0 • • • • o o o o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 CD 0 0 0 0 0 o Hi0) 0 IDID W CD 0 0 0 0 0 0 0 0 0 0 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Cl) ¢ 7/ Cl) iv E H• _h. 10 co H l0 ,..0l0 l0 Co CO Co �] J J 01 01 01 U] .A .A W N.) H H (J,7yl--''"�O CD CD CD CD CD CD CD CD CD o O l0 d> .P H 0 .A H CO' .A H �I W CO W CO N .A U] l0 ... • 0 G N . in .A CD CD CD CD CD CD CD hh H • �I l0 O H H l0 �] W CO ND .A. N 01 --I ND l0--.3 01 �] lfl O -0 O O O CD O O O Cl) < .A U] 01 l0 .A 0 01 H 01 al ND H .A l0 .A �1 .A Uf(n O W Fri J O rt /.. '-'*.t7''''eCcS.' f co ea H p _ CD O ID� l0 inW NJ H .A NJ ND N) N.) H H CD CD CDO O CD O O CD CD CD CD CD O CD CD CD N (O W l0 .A N N Q 0 CO l0 J .A H CO W 01 CD O CD CD O CD CD O CD O O CD O CD O CD CD O Ifi rF A �] .A CD 01 NJ CD CO ..0 .A --] -1 H -0 CO O O CD CD CD CD CD CD O CD CD CD CD CD CD CD W PP.)V /.J U] .A .A 0l .A co v H M nY -�� HOLLYMEAD TOWN CENTER—SWM1 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 28 (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 * H^exp [DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert L = Crest lenght Rivanna Engineering&Surveying,PLC Page 29 (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 30 (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+Vc^2/2g) , (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 31 (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 0.00 520.5000 9.5000 3.53 1.80 0.00 24.42 5.34 521.0000 10.0000 9.99 5.10 0.00 24.94 15.09 521.5000 10.5000 18.35 9.38 0.00 25.44 25.44 522.0000 11.0000 28.26 12.11 0.00 25.94 25.94 $; 522.5000 11.5000 39.49 14.33 0.00 26.42 26.42 - '67, 523.0000 12.0000 51.91 16.24 0.00 26.90 26.90 a \o,° 523.1600* 12.1600 56.32 16.79 0.00 27.05 27.05 ilk. jk,, 523.5000 12.5000 65.41 17.96 0.00 27.37 27.37 .,� ka ` 524.0000 13.0000 79.92 19.52 0.00 27.83 27.83 „ j 524.5000 13.5000 95.36 20.97 0.00 28.28 28.28 / 524.9100** 13.9100 108.75 22.09 0.00 28.66 28.66 525.0000 14.0000 111.69 22.33 0.91 28.73 28.73 525.5000 14.5000 128.86 23.60 3.08 29.17 29.17 526.0000 15.0000 146.82 24.81 5.98 29.60 29.60 526.1300*** 15.1300 151.69 25.11 6.68 29.71 29.71 526.5000 15.5000 165.55 25.97 8.30 30.03 30.03 527.0000 16.0000 185.02 27.07 9.90 30.45 30.45 527.5000 16.5000 205.19 28.14 10.88 30.86 30.86 528.0000 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 10yr storm event. ***Water surface elevation obtained during 100yr storm event. Rivanna Engineering&Surveying,PLC Page 32 (434)984-1599. HOLLYMEAD TOWN CENTER-SWM1 RESERVOIR 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 Rivanna Engineering&Surveying,PLC Page 33 (434)984-1599 HOLLYMEAD TOWN CENTER-SWM1 RESERVOIR REPORT [RESERVOIR STAGE STORAGE/DISCHARGE] Elevation Stage Area Storage Discharge (ft) (ft) (sq ft) (cu ft) (cfs) 511.0000 0.0000 0.0000 0.0000 0.00 511.5000 0.5000 0.0000 0.0000 0.00 512.0000 1.0000 0.0000 0.0000 0.00 512.5000 1.5000 0.0000 0.0000 0.00 513.0000 2.0000 0.0000 0.0000 0.00 513.5000 2.5000 0.0000 0.0000 0.00 514.0000 3.0000 0.0000 0.0000 0.00 514.5000 3.5000 0.0000 0.0000 0.00 515.0000 4.0000 0.0000 0.0000 0.00 515.5000 4.5000 0.0000 0.0000 0.00 516.0000 5.0000 0.0000 0.0000 0.00 516.5000 5.5000 0.0000 0.0000 0.00 517.0000 6.0000 0.0000 0.0000 0.00 517.5000 6.5000 0.0000 0.0000 0.00 518.0000 7.0000 0.0000 0.0000 0.00 518.5000 7.5000 0.0000 0.0000 0.00 519.0000 8.0000 0.0000 0.0000 0.00 519.5000 8.5000 0.0000 0.0000 0.00 -520.0000 - a 9.0000 32269.0000 8067.2500 0.00 r k°520.5000 9.5000 33471.5000 24502.3750 6.01 lt ,521.0000 10.0000 34674.0000 41538.7500 16.47 , e;6 \t. 521.5000 10.5000 35876.5000 59176.3750 t 27.26 1� a of " _� 3 -522.0000 11.0000 37079.0000 77415.2500 28.11 ! '}6 ),u e"` 522.5000 11.5000 38343.0000 96270.7500 28.90 i ° )e Ej• -523.0000 12.0000 39607.0000 115758.2500 29.64 V, t. 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 `Y �� -526.0000 15.0000 47094.5000 245992.0000 88.64 • . St 526.5000 15.5000 48274.0000 269834.1250 123.47 ` A' 4, s, -527.0000 16.0000 49453.5000 294266.0000 130.20 `�, 527.5000 16.5000 50633.0000 319287.6250 133.33 ,° ‘`�� Maximum Storage = 319287.6250 (cu ft) V Maximum Discharge = 133.33 (cfs) , Rivanna Engineering&Surveying,PLC Page 34 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 SEDIMENT BASIN CONDITIONS Name: DA-Z Rtd.,2 year Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow(Qp) = 10.26(cfs) Time to Peak(Tp) = 756.00(min) Time of Base(Tb) = 2880.00(min) Volume = 5.3140(ac-ft) Time Step = 2.00(min) Peak Elevation = 520.1476(ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Name . = SWM1'-Pond Storage Type = User-Defined Area Maximum Storage = 433803.7500(cu ft) Maximum Discharge = 99.97(cfs) [INFLOW HYDROGRAPH INFORMATION] Name = DA-Z,2 year Peak Flow(Qp) = 128.38 (cfs) Time to Peak(Tp) = 720.00(min) Time of Base(Tb) = 1472.39(min) Volume = 7.5394(ac-ft) Flow Multiplier = 1.00 Rivanna Engineering&Surveying,PLC Page 35 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 SEDIMENT BASIN CONDITIONS Name: DA-Z Rtd.,10 year Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow(Op) = 24.75(cfs) Time to Peak(Tp) = 744.00(min) Time of Base(Tb) = 2880.00(min) Volume = 9.9114(ac-ft) Time Step = 2.00 (min) Peak Elevation = 523.2906(ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Name = SWM1 -Pond Storage Type = User-Defined Area Maximum Storage = 433803.7500(cu ft) Maximum Discharge = 99.97(cfs) [INFLOW HYDROGRAPH INFORMATION] Name = DA-Z, 10 year Peak Flow(Op) = 200.43(cfs) Time to Peak(Tp) = 720.00(min) Time of Base(Tb) = 1472.39(min) Volume = 12.1369(ac-ft) Flow Multiplier = 1.00 Rivanna Engineering&Surveying,PLC Page 36 (434)984-1599 HOLLYMEAD TOWN CENTER—SWM1 SEDIMENT BASIN CONDITIONS Name: DA-Z Rtd.,100 year Type: Reservoir:Modified Puls [HYDROGRAPH INFORMATION] Peak Flow(Op) = 71.05(cfs) Time to Peak(Tp) = 732.00(min) Time of Base(Tb) = 2880.00(min) Volume . = 14.5493(ac-ft) Time Step = 2.00 (min) Peak Elevation = 525.1790(ft). Detention Time = NA. [RESERVOIR STRUCTURE INFORMATION] Name = SWM1 -Pond Storage Type = User-Defined Area Maximum Storage = 433803.7500 (cu ft) Maximum Discharge = 99.97(cfs) [INFLOW HYDROGRAPH INFORMATION] Name = DA-Z, 100 year Peak Flow(Qp) = 271.66(cfs) Time to Peak(Tp) = 720.00(min) Time of Base(Tb) = 1472.39(min) Volume = 16.7749(ac-ft) Flow Multiplier = 1.00 • Rivanna Engineering&Surveying,PLC Page 37 (434)984-1599 • HOLLYMEAD TOWN CENTER-SWM1 SEDIMENT BASIN CONDITIONS Name:SWM1 -Pond [RATING CURVE LIMIT] Minimum Elevation = 511.0000(ft) Maximum Elevation = 526.0000(ft) Elevation Increment = 0.5000(ft) [STAGE STORAGE INFORMATION] Storage Method:User-Defined Storage Input Method:Area No. Elevation Area Ave Area Volume Cumulative Volume (ft) (sq ft) (sq ft) (cu ft) (cu ft) 1 511.0000 0.0000 0.0000 0.0000 0.0000 2 512.0000 15476.0000 7738.0000 7738.0000 7738.0000 3 514.0000 19245.0000 17360.5000 34721.0000. 42459.0000 4 516.0000 23306.0000 21275.5000 42551.0000 85010.0000 5 518.0000 27647.0000 25476.5000 50953.0000 135963.0000 6 520.0000 32269.0000 29958.0000 59916.0000 195879.0000 7 522.0000 37079.0000 34674.0000 69348.0000 265227.0000 8 524.0000 42135.0000 39607.0000 79214.0000 344441.0000 9 525.0000 44748.0000 43441.5000 43441.5000 387882.5000 10 526.0000 47094.5000 45921.2500 45921.2500 433803.7500 Rivanna Engineering&Surveying,PLC Page 38 (434)984-1599 HOLLYMEAD TOWN CENTER-SWM1 SEDIMENT BASIN CONDITIONS [DISCHARGE INFORMATION] Name: SWM1-Sed.Basin Structure [RESERVOIR STAGE STORAGE/DISCHARGE] • Elevation Stage Area Storage Discharge. (ft) (ft) (sq ft) (cu ft) (cfs) 511.0000 0.0000 0.0000 0.0000 0.00 511.5000 0.5000 7738.0000 1934.5000 0.00 512.0000 1.0000 15476.0000 7738.0000 0.00 512.5000 1.5000 16418.2500 15711.5625 0.00 513.0000 2.0000 17360.5000 24156.2500 0.00 513.5000 2.5000 18302.7500 33072.0625 0.00 514.0000 3.0000 19245.0000 42459.0000 0.00 514.5000 3.5000 20260.2500 52335.3125 0.00 515.0000 4.0000 21275.5000 62719.2500 0.00 515.5000 4.5000 22290.7500 73610.8125 0.00 516.0000 5.0000 23306.0000 85010.0000 0.00 516.5000 5.5000 24391.2500 96934.3125 0.00 517.0000 6.0000 25476.5000 109401.2500 1.10 517.5000 6.5000 26561.7500 122410.8125 3.58 518.0000 7.0000 27647.0000 135963.0000 5.53 518.5000 7.5000 28802.5000 150075.3750 6.93 519.0000 8.0000 29958.0000 164765.5000 8.09 519.5000 8.5000 31113.5000 180033.3750 9.10 �v 520.0000 9.0000 32269.0000 195879.0000 o 10.01 520.5000 9.5000 33471.5000 212314.1250 10.85 521.0000 10.0000 34674.0000 229350.5000 11.63 3(41) 521.5000 10.5000 35876.5000 246988.1250 12.35 522.0000 11.0000 37079.0000 265227.0000 t 13.04 eel 34 522.5000 11.5000 38343.0000 284082.5000 14.59 523.0000 12.0000 39607.0000 303570.0000 3 20.17 10164i 523.5000 12.5000 40871.0000 323689.5000 28.05 524.0000 13.0000 42135.0000 344441.0000 4 37.63 14 ft 610 524.5000 13.5000 43441.5000 365835.1250 48.64 i � 525.0000 14.0000 44748.0000 387882.5000 5 60.90 525.5000 14.5000 45921.2500 410549.8125 89.24 526.0000 15.0000 47094.5000 433803.7500 & 99.97 2s j lI e Maximum Storage = 433803.7500(cu ft) Maximum Discharge = 99.97(cfs) Rivanna Engineering&Surveying,PLC Page 39 (434)984-1599 i , ` (1 , '. 1,: i. -�"`{, •� \;`` '`� `:1 - , �, \ 1 !1 , 11,E - \ \ \ , l .-„ , �' ).-,II �. 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