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HomeMy WebLinkAboutWPO200400091 Calculations 2005-06-13 (2) HYDROLOGIC/HYDRAULIC CALCULATIONS FOR JEFFERSON QUARRY BUILDING MARCH 8, 2001 REV: APRIL 25, 2002 REV: August 23, 2004 REV: October 19, 2004 OWNER: George Barlow Charlottesville. VA DEVELOPER: Turner Enterprises P.O. Box 5347 Charlottesville, VA 22903 Attn: David Turner PREPARED BY: Rivanna Engineering & Surveying, PLC 1350 Stony Point Rd. Charlottesville, VA 22911 434.984.1599 F: 434.984.8863 INDEX: 1. Flow Data 1 2. Pre-Development Hydrograph Reports ... ... ... ... ... 2-6 3. Post-Development Hydrograph Reports... ... ... ... 7-14 4. Outlet Structure Reports ... ... ... ... ... ... ... ... ... ... 15-18 5. Reservoir Report ... ... ... ... ... ... ... ... ... ... ... ... ... 19-20 6. Routed Hydrograph Report ... ... ... ... ... ... ... .21-23 `om.THop` tiesr` rx C1iu� A Ti • by Ray Miller : Si* h 2005 e Lic. No.2065 • r •-°1 • r‘,/").V. ¢. hb SURVP- FLOW DATA: AREA2: NO DETENTION PRE POST 2 YEAR STORM 1.79 CFS 1.79 CFS 10 YEAR STORM 2.40 CFS 2.39 CFS PRIMARY DRAINAGE: ROUTED PRE POST 2 YEAR STORM 13.24 CFS 13.0 CFS 10 YEAR STORM 18.37 CFS 18.36 CFS* 100 YEAR STORM 26.27 CFS 33.09 CFS *The peak flow for this storm frequency was generated by the critical storm. NOTES: 1. An as-built survey of the existing Stormwater Management Facility was performed for this project. The calculations indicate that the existing facility cannot safely pass a 10-year storm event. 2. The pre-development hydrograph reports were generated to determine the run-off prior to development of Parcel 48. These hydrograph reports vary slightly from the hydrograph reports generated in June, 1993 for development of Parcel 48. 3. The renovated Stromwater Management Facility has been designed to meet MS-19 for Parcels 48 and 48A. ftwol FLOOD HYDROGRAPH REPORT Hydrograph Number: 1 Name: Pre-Dev 2 Year Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 13.24 (cfs) Time to Peak (Tp) = 13.00 (min) Time of Base (Tb) = 32.50 (min) Volume = 0.30 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.30 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef Vacant Parcel 1.50 0 0.40 Adjacent Vavant Lot 2.62 0 0.40 Public Road 0.70 0 0.80 High Density Residential 2.00 0 0.70 Overall Approximation 6.82 NA 0.53 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 13.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.79 (in) Return Period = 2 (yr) Storm Duration = 0.22 (hr) FLOOD HYDROGRAPH REPORT Hydrograph Number: 2 Name: Pre-Dev 10 Year Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 18.37 (cfs) Time to Peak (Tp) = 13.00 (min) Time of Base (Tb) = 32.50 (min) Volume = 0.41 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.41 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef Vacant Parcel 1.50 0 0.40 Adjacent Vacant Lot 2.62 0 0.40 Public Road 0.70 0 0.80 High Density Residential 2.00 0 0.70 Overall Approximation 6.82 NA 0.53 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 13.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.09 (in) Return Period = User Defined (yr) Storm Duration = 0.22 (hr) rte" FLOOD HYDROGRAPH REPORT Hydrograph Number: 5 Name: Pre-Dev 100 Year Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 26.27 (cfs) Time to Peak (Tp) = 13.00 (min) Time of Base (Tb) = 32.50 (min) Volume = 0.59 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.59 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef Vacant Parcel 1.50 0 0.40 Adjacent Vacant Lot 2.62 0 0.40 Public Road 0.70 0 0.80 High Density Residential 2.00 0 0.70 Overall Approximation 6.82 NA 0.53 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 13.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.56 (in) Return Period = 100 (yr) Storm Duration = 0.22 (hr) FLOOD HYDROGRAPH REPORT Hydrograph Number: 3 Name: Area2 Pre 2 Yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.79 (cfs) Time to Peak (Tp) = 8.00 (min) Time of Base (Tb) = 20.00 (min) Volume = 0.02 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.02 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0. 97 NA 0.40 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 8.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.61 (in) Return Period = 2 (yr) Storm Duration = 0.13 (hr) FLOOD HYDROGRAPH REPORT Hydrograph Number: 4 Name: Area2 Pre 10 Yr Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 2.40 (cfs) Time to Peak (Tp) = 8.00 (min) Time of Base (Tb) = 20.00 (min) Volume = 0.03 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.03 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef <None> Overall Approximation 0.97 NA 0.40 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 8.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.82 (in) Return Period = User Defined (yr) Storm Duration = 0. 13 (hr) FLOOD HYDROGRAPH REPORT Hydrograph Number: 7 Name: Area2 2yr Post Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 1.79 (cfs) Time to Peak (Tp) = 8.00 (min) Time of Base (Tb) = 20.00 (min) Volume = 0.02 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.02 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef Undisturbed Area 0.45 0 0.40 Building Area 0.23 0 0. 90 Overall Approximation 0.68 NA 0.57 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 8.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.61 (in) Return Period 2 (yr) Storm Duration = 0.13 (hr) Sire '14.•01 FLOOD HYDROGRAPH REPORT Hydrograph Number: 8 Name: Area2 l0yr Post Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 2.39 (cfs) Time to Peak (Tp) = 8.00 (min) Time of Base (Tb) = 20.00 (min) Volume = 0.03 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.03 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef Undisturbed Area 0.45 0 0.40 Building Area 0.23 0 0. 90 Overall Approximation 0.68 NA 0.57 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 8.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.82 (in) Return Period = User Defined (yr) Storm Duration = 0.13 (hr) FLOOD HYDROGRAPH REPORT Hydrograph Number: 1 Name: Post Dev 2 Year Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 21.40 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 25.00 (min) Volume = 0.37 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.37 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef New Site 1.85 0 0.75 Adjacent Office 2.10 0 0.75 Public Roads 0.70 0 0.80 High Density Residential 2.00 0 0.70 Undistrubed Area 0.50 0 0.40 Overall Approximation 7.15 NA 0.72 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 10.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.69 (in) Return Period = 2 (yr) Storm Duration = 0.17 (hr) FLOOD HYDROGRAPH REPORT Hydrograph Number: 9 Name: Post Dev 2 Year CRIT Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 16.04 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 32.40 (min) Volume = 0.44 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.44 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef New Site 1.85 0 0.75 Adjacent Office 2.10 0 0.75 Public Roads 0.70 0 0.80 High Density Residential 2.00 0 0.70 Undistrubed Area 0.50 0 0.40 Overall Approximation 7.15 NA 0.72 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 10.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.90 (in) Return Period = 2 (yr) Storm Duration = 0.29 (hr) 'Store. "SlioW FLOOD HYDROGRAPH REPORT Hydrograph Number: 2 Name: Post Dev 10 Year Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 29.14 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 25.00 (min) Volume = 0.50 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.50 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef New Site 1.85 0 0.75 Adjacent Office Building 2.10 0 0.75 Public Road 0.70 0 0.80 High Density Residential 2.00 0 0.70 Undisturbed Area 0.50 0 0.40 Overall Approximation 7.15 NA 0.72 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 10.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 0.94 (in) Return Period = User Defined (yr) Storm Duration = 0.17 (hr) N1400' ' 41011 FLOOD HYDROGRAPH REPORT Hydrograph Number: 10 Name: Post Dev 10 Year CRIT Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 21.23 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 34.80 (min) Volume = 0.65 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.65 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef New Site 1.85 0 0.75 Adjacent Office Building 2.10 0 0.75 Public Road 0.70 0 0.80 High Density Residential 2.00 0 0.70 Undisturbed Area 0.50 0 0.40 Overall Approximation 7.15 NA 0.72 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 10.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.36 (in) Return Period = User Defined (yr) Storm Duration = 0.33 (hr) NkrioJ FLOOD HYDROGRAPH REPORT Hydrograph Number: 3 Name: Post Dev 100 Year Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 41.22 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 25.00 (min) Volume = 0.71 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0.71 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef New Site 1.85 0 0.75 Adjacent Office 2.10 0 0.75 Public Road 0.70 0 0.80 High Density Residential 2.00 0 0.70 Undistrubed Area 0.50 0 0.40 Overall Approximation 7. 15 NA 0.72 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 10.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 1.33 (in) Return Period = 100 (yr) Storm Duration = 0.17 (hr) FLOOD HYDROGRAPH REPORT Hydrograph Number: 11 Name: Post Dev 100 Year CRIT Type: Modified Rational [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 29.95 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 36.00 (min) Volume = 0.97 (ac-ft) Time Step = 1.00 (min) Flow Multiplier = 1.00 [RATIONAL HYDROGRAPH INFORMATION] Flow Multiplier = 1.00 Receding Limb Factor = 1.50 [APPROXIMATE STORAGE] Maximum Outflow = 0.00 (cfs) Maximum Storage = 0. 97 (cu ft) [BASIN INFORMATION] [WEIGHTED WATERSHED AREA] Description Area CN Runoff Coef New Site 1.85 0 0.75 Adjacent Office 2.10 0 0.75 Public Road 0.70 0 0.80 High Density Residential 2.00 0 0.70 Undistrubed Area 0.50 0 0.40 Overall Approximation 7.15 NA 0.72 [TIME CONCENTRATION -- User Defined] Time of Concentration (Tc) = 10.00 (min) [RAINFALL DESCRIPTION] Distribution Type = Synthetic Total Precipitation = 2.03 (in) Return Period = 100 (yr) Storm Duration = 0.35 (hr) 41"10i *tori OUTLET STRUCTURE REPORT Structure Number : 1 Type : Stand Pipe Name : Outlet - SWM Pond [RATING CURVE LIMIT] Minimum Elevation = 557.00 (ft) Maximum Elevation = 564.00 (ft) Elevation Increment = 0. 10 (ft) [STAND PIPE INFORMATION] [ORIFICE INFORMATION] Diameter = 3.00 (ft) Crest Length = 9.42 (ft) Effective Crest Length = 8.42 (ft) Orifice Coefficient = 0.60 Fractional Open Area = 0. 90 [ORIFICE EQUATION] Q = Co*A( (2gh) /k) ^0.5 [DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (sq ft) [WEIR INFORMATION] Crest Elevation = 562. 90 (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 [OPTIONAL WEIR INFORMATION] Structure Number : 1 Type : Rectangular Weir Suppressed [WEIR INFORMATION] Crest Length = 1.00 (ft) Crest Elevation = 561.90 (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 fir'` 'taro [OPTIONAL ORIFICE INFORMATION] Structure Number : 1 Type : Rectangular Orifice [OPTIONAL ORIFICE INFORMATION] Height = 1.00 (ft) Width = 1.10 (ft) Invert Elevation = 560.50 (ft) Orifice Coefficient = 0.60 Number of Openings = 2 [ORIFICE EQUATION] Q = Co*A( (2gh) /k) ^0.5 [DEFINITIONS] Co = Orifice Coefficient A = Wetted Area, (cfs) k = 1 [CULVERT INFORMATION] Type : Circular Concrete - Square Edge with Headwall [OUTLET STRUCTURE INFORMATION] Diameter = 24.00 (in) Invert Elevation = 557.00 (ft) Pipe Length = 30.00 (ft) Slope = 0.02 Manning's n Value = 0.01 Orifice Coefficient = 0.60 Tailwater Elevation = 556.40 (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 = 15.55 [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 = 17.77 [DEFINITIONS] H = Headwater depth above inlet control section invert, (ft) Diam = Interior height of culvert barrel, (ft) Hc = 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) *40411, `✓ [STAND PIPE STAGE VS. DISCHARGE] Elevation Stage Weirs Orifices Stand Pipe Culvert Total (ft) (ft) (cfs) (cfs) (cfs) (cfs) (cfs) 560.50 3.50 0.00 0.00 0.00 23.25 0.00 560.60 3.60 0.00 0.24 0.00 23.78 0.24 560.70 3.70 0.00 0.67 0.00 24.29 0.67 560.80 3.80 0.00 1.23 0.00 24 .80 1.23 560.90 3.90 0.00 1.89 0.00 25.29 1.89 561.00 4.00 0.00 2.65 0.00 25.78 2. 65 561.10 4.10 0.00 3.48 0.00 26.26 3.48 561.20 4.20 0.00 4.39 0.00 26.72 4.39 561.30 4 .30 0.00 5.36 0.00 27. 18 5.36 561.40 4.40 0.00 6.39 0.00 27. 64 6.39 561.50 4.50 0.00 7.49 0.00 28.08 7.49 561.60 4.60 0.00 8.20 0.00 28.52 8.20 561.70 4.70 0.00 8.86 0.00 28. 95 8.86 561.80 4.80 0.00 9.47 0.00 29.38 9.47 561.90 4.90 0.00 10.05 0.00 29.80 10.05 562.00 5.00 0.11 10.59 0.00 30.21 10. 69 562.10 5.10 0.30 11.11 0.00 30.62 11.40 562.20 5.20 0.55 11.60 0.00 31.02 12.15 562.30 5.30 0.84 12.07 0.00 31.42 12. 92 562.40 5.40 1.18 12.53 0.00 31.81 13.71 562.50 5.50 1.55 12.97 0.00 32.20 14.52 562.60 5.60 1.95 13.39 0.00 32.58 15.34 562.70 5.70 2.38 13.81 0.00 32. 96 16.19 562.80 5.80 2.84 14.21 0.00 33.33 17.05 562.90 5.90 3.33 14.60 0.00 33.70 17.93 563.00 6.00 3.84 14.97 0.89 34.07 19.70 563.10 6.10 4.38 15.34 2.51 34.43 22.23 563.20 6.20 4.94 15.71 4.61 34 .79 25.25 563.30 6.30 5.52 16.06 7.10 35.14 28. 67 563.40 6.40 6.12 16.40 9.92 35.49 32.44 563.50 6.50 6.74 16.74 13.04 35.84 35.84 563.60 6.60 7.38 17.07 16.43 36. 18 36.18 563.70 6.70 8.04 17.40 20.08 36.53 36.53 563.80 6.80 8.72 17.72 23.63 36.86 36.86 563.90 6.90 9.42 18.03 26.42 37.20 37.20 564 .00 7.00 10.13 18.34 29.21 37.53 37.53 Soo, .4%1101i OUTLET STRUCTURE REPORT Structure Number : 2 Type : Trapezoidal Weir Name : Emergency Spillway [RATING CURVE LIMIT] Minimum Elevation = 557.00 (ft) Maximum Elevation = 564.00 (ft) Elevation Increment = 0.50 (ft) [OUTLET STRUCTURE INFORMATION] Crest Length = 10.00 (ft) Angle of Walls = 45.0000 Crest Elevation = 563.00 (ft) Weir Coefficient = 3.33 Exponential = 1.50 [TRAPEZOIDAL EQUATION] Q = Cw * ( L + 0.8H * tan ( ang/2.0 ) ) * H^exp [DEFINITIONS] Cw = Weir Coefficient H = Headwater depth above inlet control section invert L = Crest lenght ang = Angle of the walls [MAXIMUM DISCHARGE] Q = 34.40 (cfs) [WEIR STAGE VS. DISCHARGE] Elevation (ft) Stage (ft) Discharge (cfs) 557.00 0.00 0.00 557.50 0.50 0.00 558.00 1.00 0.00 558.50 1.50 0.00 559.00 2.00 0.00 559.50 2.50 0.00 560.00 3.00 0.00 560.50 3.50 0.00 561.00 4.00 0.00 561.50 4.50 0.00 562.00 5.00 0.00 562.50 5.50 0.00 563.00 6.00 0.00 563.50 6.50 11. 97 564.00 7.00 34.40 41101 NIS RESERVOIR REPORT Reservoir Number: 1 Name: Detention Pond [RATING CURVE LIMIT] Minimum Elevation = 557.00 (ft) Maximum Elevation = 564.00 (ft) Elevation Increment = 0.10 (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) 1 559.90 0.00 0.00 0.00 0.00 2 560.00 2321.00 1160.50 116.05 116.05 3 562.00 3445.00 2883.00 5766.00 5882.05 4 564.00 4870.00 4157.50 8315.00 14197.05 [DISCHARGE INFORMATION] Structure Number: 1 Type: Name: Outlet - SWM Pond Structure Number: 2 Type: Trapezoidal Weir Name: Spillway '41ftre Niro/ [RESERVOIR STAGE STORAGE/DISCHARGE] Elevation Stage Area Storage Discharge (ft) (ft) (sq ft) (cu ft) (cfs) 560.00 3.00 2321.00 116.05 0.00 560.10 3.10 2377.20 350.96 0.00 560.20 3.20 2433.40 591.49 0.00 560.30 3.30 2489.60 837.64 0.00 560.40 3.40 2545.80 1089.41 0.00 560.50 3.50 2602.00 1346.80 0.00 560. 60 3. 60 2658.20 1609.81 0.24 560.70 3.70 2714 .40 1878.44 0.67 560.80 3.80 2770. 60 2152.69 1.23 560.90 3. 90 2826.80 2432.56 1.89 561.00 4.00 2883.00 2718.05 2.65 561.10 4.10 2939.20 3009.16 3.48 561.20 4.20 2995.40 3305.89 4.39 561.30 4.30 3051.60 3608.24 5.36 561.40 4.40 3107.80 3916.21 6.39 561.50 4.50 3164.00 4229.80 7.49 561.60 4. 60 3220.20 4549.01 8.20 561.70 4.70 3276.40 4873.84 8.86 561.80 4.80 3332.60 5204.29 9.47 561. 90 4. 90 3388.80 5540.36 10.05 562.00 5.00 3445.00 5882.05 10.69 562.10 5. 10 3516.25 6230.11 11.40 562.20 5.20 3587.50 6585.30 12.15 562.30 5.30 3658.75 6947.61 12. 92 562.40 5.40 3730.00 7317.05 13.71 562.50 5.50 3801.25 7693.61 14.52 562.60 5. 60 3872.50 8077.30 15.34 562.70 5.70 3943.75 8468.11 16.19 562.80 5.80 4015.00 8866.05 17.05 562. 90 5. 90 4086.25 9271.11 17. 93 563.00 6.00 4157.50 9683.30 19.70 563.10 6. 10 4228.75 10102.61 23.29 563.20 6.20 4300.00 10529.05 28.25 563.30 6.30 4371.25 10962.61 34.20 563.40 6.40 4442.50 11403.30 40. 98 563.50 6.50 4513.75 11851.11 47.81 563.60 6.60 4585.00 12306.05 51. 97 563.70 6.70 4656.25 12768.11 56.48 563.80 6.80 4727.50 13237.30 61.32 563.90 6.90 4798.75 13713.61 66.48 564 .00 7.00 4870.00 14197.05 71. 93 Maximum Storage = 14197.05 (cu ft) Maximum Discharge = 71.93 (cfs) Noiri `*,r/ FLOOD HYDROGRAPH REPORT Hydrograph Number: 4 Name: 2 Year Routed Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 13.00 (cfs) Time to Peak (Tp) = 16.00 (min) Time of Base (Tb) = 366.00 (min) Volume = 0.34 (ac-ft) Time Step = 1.00 (min) Peak Elevation = 562.31 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Number = 1 Name = Detention Pond Storage Type = User-Defined Area Maximum Storage = 14197.05 (cu ft) Maximum Discharge = 37.53 (cfs) [INFLOW HYDROGRAPH INFORMATION] Number = 1 Name = Post Dev 2 Year Peak Flow (Qp) = 21.40 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 25.00 (min) Volume = 0.37 (ac-ft) Flow Multiplier = 1.00 FLOOD HYDROGRAPH REPORT Hydrograph Number: 5 Name: 10 Year Routed Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 18.36 (cfs) Time to Peak (Tp) = 22.00 (min) Time of Base (Tb) = 377.00 (min) Volume = 0.62 (ac-ft) Time Step = 1.00 (min) Peak Elevation = 562.92 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Number = 1 Name = Detention Pond Storage Type = User-Defined Area Maximum Storage = 14197.05 (cu ft) Maximum Discharge = 37.53 (cfs) [INFLOW HYDROGRAPH INFORMATION] Number = 10 Name = Post Dev 10 Year CRIT Peak Flow (Qp) = 21.23 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 34.80 (min) Volume = 0.65 (ac-ft) Flow Multiplier = 1.00 FLOOD HYDROGRAPH REPORT Hydrograph Number: 6 Name: 100 Year Routed Type: Reservoir: Modified Puls [HYDROGRAPH INFORMATION] Peak Flow (Qp) = 33.09 (cfs) Time to Peak (Tp) = 13.00 (min) Time of Base (Tb) = 369.00 (min) Volume = 0.68 (ac-ft) Time Step = 1.00 (min) Peak Elevation = 563.28 (ft) Detention Time = NA [RESERVOIR STRUCTURE INFORMATION] Number = 1 Name = Detention Pond Storage Type = User-Defined Area Maximum Storage = 14197.05 (cu ft) Maximum Discharge = 71.93 (cfs) [INFLOW HYDROGRAPH INFORMATION] Number = 3 Name = Post Dev 100 Year Peak Flow (Qp) = 41.22 (cfs) Time to Peak (Tp) = 10.00 (min) Time of Base (Tb) = 25.00 (min) Volume = 0.71 (ac-ft) Flow Multiplier = 1.00