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HomeMy WebLinkAbout6.7-36924-200007772/5/2025 Purpose The purpose of this report is to show that the existing and proposed facilities are designed to handle the 5-year and 10-year storms per City of Bakersfield standards and specifications. These analysis show that the existing sump is adequately sized for the additional runoff and the proposed storm drainage pipe and inlets are adequately sized, as shown on Exhibit A, per City of Bakersfield’s Standards. Introduction The overall site is 35.78-acres and is currently developed on approximately 18.04-acres. The existing improvements surface drain to the existing, on-site retention basin. Derrel’s is expanding and developing the remainder 17.74-acres. See Exhibit A. Evaluation and Methodology The flow values used to determine catch basin and pipe sizing were calculated using the City of Bakersfield Rational Method in accordance with City Subdivision Standards. The equation is Q = C*I*A, where Q is defined as flow in cubic feet per second, C is defined as the runoff coefficient, I is defined as the intensity, and A is defined as the catchment area in acres. In accordance with City of Bakersfield standards, the depth of flow in the street gutter from the 5-year event is not permitted to overtop the street curb (6-inches). The 10-year event, per City standards, is used to size the storm drain system. Hydraflow Express was used to determine the velocities, depths, and spread for gutter flows and inlet capacities and depths. The Hydraflow Express reports are provided in the Appendix. The 10-year HGL analysis was performed in AutoDesk Storm Sewers. In all cases, the HGL shall stay below ground with at least 0.5-foot of freeboard below manhole rim or inlet flowline. HGL calculations are included in the Appendix. The Nomograph for capacity of curb opening inlets at low points, see appendix, was used to calculate the proper length of the curb inlet opening necessary to minimize the spread of the flow into the pavement. Per the Nomograph, the curb inlet per City of Bakersfield Standards will capture 1.5 cfs per linear foot of opening. The proposed street curb inlet is proposed to have an opening width of 6’, which will provide total interception for up to 9 cfs per the nomographs capture rate of 1.5cfs/LF. With a 10- year flow of 2.17 cfs, the existing catch basin will provide total interception. The existing on-site retention basin was designed with 2.5:1 side slopes and to have a depth over 20’ per the original design approved by the City of Bakersfield. As noted above, the entire site drains to the on- site retention basin. The design water surface elevation for each basin is 1’ below the lowest top of basin elevation or lowest inlet flowline elevation, whichever is lower. The basin is designed to have a maximum water depth of 20.28’. The current required volume of the retention basin was determined using the City of Bakersfield sump volume equation V = 0.15 * ∑(C*A). The current required volume is 4.83 acre-feet. The provided volume is 15.96 acre-feet. Calculations are included in the Appendix. Conclusion The street catch basin will provide total interception for the 10-year flow. The hydraulic grade line of the proposed system is more than 6” below the flowline elevation at each inlet. The street spread is within City of Bakersfield standards. The on-site retention basin is adequately sized per City of Bakersfield standards. 24-20000777 2/5/2025 Appendix 24-20000777 2/5/2025 APN: 54008212 APN: 54008217 APN: 54008216 APN: 54008213 APN: 54001010 APN: 54001042 APN: 54001043 E E DYH EXHIBIT: A9001 PANAMA LANE BAKERSFIELD, CA 93311 DMS #66 DRAINAGE EXHIBIT MASMASMAS41445 10/10/24 DERREL'S MINI STORAGE 0' GRAPHIC SCALE 0'150'150' ( IN FEET ) 1 inch = 150 feet 6205 District Blvd.Bakersfield, CA. 93313 24-20000777 2/5/2025 Hydrology: 5-year 24-20000777 2/5/2025 Study Name:DMS#66Storm Return:5 yrRunoff A*C ∑(A*C) Tc I Q S V L H Notes:Coeff. "C" Minutes in/hr cfs % fps feet inches Roof to Gutter=10 mins per 3.3.2.1 for R3, Commercial, industrial and 15 mins for R1, R2; C=0.9 for commercial per D-2;ALL INLETS ARE IN SAG. Area A-Street1.27 0.95 1.21 10 1.55 1.87 4.31Street CB A w/ 6' openingArea B1.76 0.9 1.58 10 1.55 2.46 2.00Drop Inlet BArea C2.31 0.9 2.08 10 1.55 3.22 2.40Drop Inlet CArea D 1.83 0.9 1.65 10 1.55 2.55 2.05Drop Inlet DArea E1.54 0.9 1.39 10 1.55 2.15 1.83Drop Inlet EArea F 2.12 0.9 1.91 10 1.55 2.96 2.27Drop Inlet FArea G1.54 0.9 1.39 10 1.55 2.15 1.83Drop Inlet GArea H1.74 0.9 1.57 10 1.55 2.43 2.00Drop Inlet HArea I 1.48 0.9 1.33 10 1.55 2.06 1.78Drop Inlet IArea J0.49 0.9 0.44 10 1.55 0.68 0.85Drop Inlet JArea K 1.41 0.9 1.27 10 1.55 1.97 1.73Drop Inlet KCity of Bakersfield Hydrology Manual*H=depth at inlet Hydrology CalculationsPoint Acres24-200007772/5/2025 Channel ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Street FlowGutterCross Sl, Sx (ft/ft) = 0.020 Cross Sl, Sw (ft/ft) = 0.083Gutter Width (ft) = 2.00Invert Elev (ft) = 100.00Slope (%) = 0.20N-Value = 0.013CalculationsCompute by: Known QKnown Q (cfs) = 1.87HighlightedDepth (ft) = 0.33Q (cfs) = 1.870 Area (sqft) = 1.22 Velocity (ft/s) = 1.54Wetted Perim (ft) = 10.79Crit Depth, Yc (ft) = 0.32Spread Width (ft) = 10.45EGL (ft) = 0.37024681012141618202224Elev (ft)Depth (ft)Section99.75-0.25100.000.00100.250.25100.500.50100.750.75101.001.00Reach (ft) 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Catch Basin A: 5-yrCurb InletLocation = SagCurb Length (ft) = 6.00Throat Height (in) = 6.00Grate Area (sqft) = -0-Grate Width (ft) = -0-Grate Length (ft) = -0-GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = 2.00Gutter Width (ft) = 2.00Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 1.87Highlighted Q Total (cfs) = 1.87 Q Capt (cfs) = 1.87 Q Bypass (cfs) = -0-Depth at Inlet (in) = 4.31Efficiency (%) = 100Gutter Spread (ft) = 9.63Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet B: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.46Highlighted Q Total (cfs) = 2.46 Q Capt (cfs) = 2.46 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.00Efficiency (%) = 100Gutter Spread (ft) = 20.03Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet C: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 3.22Highlighted Q Total (cfs) = 3.22 Q Capt (cfs) = 3.22 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.40Efficiency (%) = 100Gutter Spread (ft) = 23.31Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet D: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.55Highlighted Q Total (cfs) = 2.55 Q Capt (cfs) = 2.55 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.05Efficiency (%) = 100Gutter Spread (ft) = 20.43Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet E: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.15Highlighted Q Total (cfs) = 2.15 Q Capt (cfs) = 2.15 Q Bypass (cfs) = -0-Depth at Inlet (in) = 1.83Efficiency (%) = 100Gutter Spread (ft) = 18.59Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet F: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.96Highlighted Q Total (cfs) = 2.96 Q Capt (cfs) = 2.96 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.27Efficiency (%) = 100Gutter Spread (ft) = 22.22Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet G: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.15Highlighted Q Total (cfs) = 2.15 Q Capt (cfs) = 2.15 Q Bypass (cfs) = -0-Depth at Inlet (in) = 1.83Efficiency (%) = 100Gutter Spread (ft) = 18.59Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet H: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.43Highlighted Q Total (cfs) = 2.43 Q Capt (cfs) = 2.43 Q Bypass (cfs) = -0-Depth at Inlet (in) = 1.99Efficiency (%) = 100Gutter Spread (ft) = 19.89Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet I: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.06Highlighted Q Total (cfs) = 2.06 Q Capt (cfs) = 2.06 Q Bypass (cfs) = -0-Depth at Inlet (in) = 1.78Efficiency (%) = 100Gutter Spread (ft) = 18.17Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet J: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 0.68Highlighted Q Total (cfs) = 0.68 Q Capt (cfs) = 0.68 Q Bypass (cfs) = -0-Depth at Inlet (in) = 0.85Efficiency (%) = 100Gutter Spread (ft) = 10.41Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet K: 5-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 1.97Highlighted Q Total (cfs) = 1.97 Q Capt (cfs) = 1.97 Q Bypass (cfs) = -0-Depth at Inlet (in) = 1.73Efficiency (%) = 100Gutter Spread (ft) = 17.73Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Hydrology: 10-year 24-20000777 2/5/2025 Study Name:DMS#66Storm Return:10 yrRunoff A*C ∑(A*C) Tc I Q S V L Notes:Coeff. "C" Minutes in/hr cfs % fps feetRoof to Gutter=10 mins per 3.3.2.1 for R3, Commercial, industrial and 15 mins for R1, R2; C=0.9 for commercial per D-2;ALL INLETS ARE IN SAG. Area A-Street1.27 0.95 1.21 10 1.80 2.17Street CB A w/ 6' openingArea B1.76 0.9 1.58 10 1.80 2.85 Drop Inlet BArea C2.31 0.9 2.08 10 1.80 3.74Drop Inlet CArea D 1.83 0.9 1.65 10 1.80 2.96Drop Inlet DArea E1.54 0.9 1.39 10 1.80 2.49Drop Inlet EArea F 2.12 0.9 1.91 10 1.80 3.43Drop Inlet FArea G1.54 0.9 1.39 10 1.80 2.49 Drop Inlet GArea H1.74 0.9 1.57 10 1.80 2.82Drop Inlet HArea I 1.48 0.9 1.33 10 1.80 2.40Drop Inlet IArea J0.49 0.9 0.44 10 1.80 0.79Drop Inlet JArea K 1.41 0.9 1.27 10 1.80 2.28Drop Inlet KCity of Bakersfield Hydrology Manual Hydrology CalculationsPoint Acres24-200007772/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Catch Basin A: 10-yrCurb InletLocation = SagCurb Length (ft) = 6.00Throat Height (in) = 6.00Grate Area (sqft) = -0-Grate Width (ft) = -0-Grate Length (ft) = -0-GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = 2.00Gutter Width (ft) = 2.00Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.17Highlighted Q Total (cfs) = 2.17 Q Capt (cfs) = 2.17 Q Bypass (cfs) = -0-Depth at Inlet (in) = 4.55Efficiency (%) = 100Gutter Spread (ft) = 10.64Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet B: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.85Highlighted Q Total (cfs) = 2.85 Q Capt (cfs) = 2.85 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.21Efficiency (%) = 100Gutter Spread (ft) = 21.75Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet C: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 3.74Highlighted Q Total (cfs) = 3.74 Q Capt (cfs) = 3.74 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.65Efficiency (%) = 100Gutter Spread (ft) = 25.41Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet D: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.96Highlighted Q Total (cfs) = 2.96 Q Capt (cfs) = 2.96 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.27Efficiency (%) = 100Gutter Spread (ft) = 22.22Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet E: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.49Highlighted Q Total (cfs) = 2.49 Q Capt (cfs) = 2.49 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.02Efficiency (%) = 100Gutter Spread (ft) = 20.16Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet F: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 3.43Highlighted Q Total (cfs) = 3.43 Q Capt (cfs) = 3.43 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.50Efficiency (%) = 100Gutter Spread (ft) = 24.17Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet G: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.49Highlighted Q Total (cfs) = 2.49 Q Capt (cfs) = 2.49 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.02Efficiency (%) = 100Gutter Spread (ft) = 20.16Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet H: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.82Highlighted Q Total (cfs) = 2.82 Q Capt (cfs) = 2.82 Q Bypass (cfs) = -0-Depth at Inlet (in) = 2.20Efficiency (%) = 100Gutter Spread (ft) = 21.62Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet I: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.40Highlighted Q Total (cfs) = 2.40 Q Capt (cfs) = 2.40 Q Bypass (cfs) = -0-Depth at Inlet (in) = 1.97Efficiency (%) = 100Gutter Spread (ft) = 19.76Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet J: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 0.79Highlighted Q Total (cfs) = 0.79 Q Capt (cfs) = 0.79 Q Bypass (cfs) = -0-Depth at Inlet (in) = 0.94Efficiency (%) = 100Gutter Spread (ft) = 11.16Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Inlet ReportHydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Monday, May 13 2024Drop Inlet K: 10-yrDrop Grate InletLocation = SagCurb Length (ft) = -0-Throat Height (in) = -0-Grate Area (sqft) = 4.50Grate Width (ft) = 3.00Grate Length (ft) = 3.00GutterSlope, Sw (ft/ft) = 0.020Slope, Sx (ft/ft) = 0.020Local Depr (in) = -0-Gutter Width (ft) = 3.33Gutter Slope (%) = -0-Gutter n-value = -0-CalculationsCompute by: Known QQ (cfs) = 2.28Highlighted Q Total (cfs) = 2.28 Q Capt (cfs) = 2.28 Q Bypass (cfs) = -0-Depth at Inlet (in) = 1.90Efficiency (%) = 100Gutter Spread (ft) = 19.20Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20000777 2/5/2025 Storm Sewers Report (Pipe and Hydraulic Grade Line Calculations) 24-20000777 2/5/2025 24-200007772/5/2025 24-200007772/5/2025 24-200007772/5/2025 94.585Lf-18" @ 0.25%342.0024-200007772/5/2025 Retention Basin Sizing 24-20000777 2/5/2025 PREPARED: 5/13/2024JOB NO: 41445REVISED: 5/13/2024C1=0.9 runoff coefficientA1=35.78 acresC2=runoff coefficientA2=acresV= 4.83 acre-feet required 15.96 acre-feet provided= 210,408ft3 required695,121ft3 provided= 7,793yd3 required25,745yd3 providedAbottom = 15,443 SFAmiddle =33,745 SFAtop =55,234 SFdepth = 20.28 feetV= 695,121 ft3DERREL'S MINI STORAGE #66 @ 9001 PANAMA LNRETENTION BASIN SIZING CALCULATIONPer City of Bakersfield Subdivision and Engineering Design Policy Manual Prismoidal Formula: V=(1/6)*(A,bottom + 4*A,middle + A,top)*depth Nomograph for Catch Basin in Sag 24-20000777 2/5/2025 24-200007772/5/2025