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Home My WebLink AboutSW3231102_Stormwater Report_20240905 (2) Autodesk® Storm and Sanitary Analysis 2016 - Version 13.5.302 (Build 0) ******************* Project Description ******************* File Name Bioretention BUA Volume raised 7 in.SPF **************** Analysis Options **************** Flow Units cfs Subbasin Hydrograph Method SCS TR-55 Time of Concentration Kirpich Link Routing Method Kinematic Wave Storage Node Exfiltration Constant rate, wetted area Starting Date JAN-01-2023 00,00:00 Ending Date JAN-06-2023 00:00:00 Report Time Step 00:05:00 • *ElementCount * *Number ofrain gages 1 Number of subbasins 2 Number of nodes 2 Number of links 2 **************** Raingage Summary **************** Gage Data Data Recording ID Source Type Interval min Rain Gage-01 10-Year CUMULATIVE 6.00 **************** Subbasin Summary **************** Subbasin Total Flow Average Peak Rate Raingage Area Length Slope Factor ID acres ft Sub-Post-East Not Routed 1.97 500.00 0.5000 484.00 Rain Gage-0l Sub-Post-East Routed 7.64 850.00 1.4700 484.00 Rain Gage-01 Node Summary • ********Node Element Invert Maximum Ponded External ID Type Elevation Elev. Area Inflow ft ft ft' Out-Post-East OUTFALL 771.00 772.67 0.00 Bioretention Area STORAGE 776.58 778.00 0.00 Link Summary • ********Link From Node To Node Element Length Slope Manning's ID Type ft % Roughness Emergency SpillwayBioretention AreaOut-Post-East CHANNEL 85.0 7.7451 0.0180 Precast StructureBioretention AreaOut-Post-East ORIFICE ********************* Cross Section Summary ********************* Link Shape Depth/ Width No. of Cross Full Flow Design ID Diameter Barrels Sectional Hydraulic Flow Area Radius Capacity ft ft ft' ft cfs Emergency Spillway TRAPEZOIDAL 1.67 11.67 1 13.89 1.12 343.30 ************************** Volume Depth Runoff Quantity Continuity acre-ft inches ************************** Total Precipitation 4.140 5.168 Surface Runoff 0.338 0.421 Continuity Error (%) -0.003 ************************** Volume Volume Flow Routing Continuity acre-ft Mgallons ************************** External Inflow 0.000 0.000 External Outflow 0.719 0.234 Initial Stored Volume 0.000 0.000 Final Stored Volume 0.000 0.000 Continuity Error (6) 0.522 ****************************************** Composite Curve Number Computations Report ****************************************** Autodesk Storm and Sanitary Analysis Subbasin Sub-Post-East Not Routed Area Soil Soil/Surface Description (acres) Group CM > 75% grass cover, Good 0.25 B 61.00 Woods, Good 1.72 B 55.00 Composite Area & Weighted CN 1.97 55.76 Subbasin Sub-Post-East Routed Area Soil Soil/Surface Description (acres) Group CM Gravel roads 4.14 B 85.00 Paved parking & roofs 0.16 B 98.00 Woods, Good 1.99 B 55.00 > 75% grass cover, Good 1.35 B 61.00 Composite Area & Weighted CN 7.64 73.22 ************************************************* Kirpich Time of Concentration Computations Report ************************************************* Tc = (0.0078 * (L^0.77) * (S^-0.385)) Where: Tc - Time of Concentration (min) L = Flow length (ft) S - Slope (ft/ft) Subbasin Sub-Post-East Not Routed User-Defined TOC override (minutes): 5.00 Subbasin Sub-Post-East Routed Flow length (ft): 850.00 Slope (%): 1.47 Computed TOC (minutes): 7.13 *********************** Subbasin Runoff Summary *********************** Subbasin Total Total Peak Weighted Time of ID Precip Runoff Runoff Curve Concentration in in cfs Number days hh:mm:ss Sub-Post-East Not Routed 5.10 1.08 2.93 55.760 0 00:05:00 Sub-Post-East Routed 5.10 2.38 27.00 73.220 0 00:07:07 ****************** Node Depth Summary ****************** Node Average Maximum Maximum Time of Max Total Total Retention ID Depth Depth HGL Occurrence Flooded Time Time Attained Attained Attained Volume Flooded ft ft ft days hh:mm acre-in minutes hh:mm:ss Out-Post-East 0.00 0.00 771.00 0 00:00 0 0 0:00:00 Bioretention Area 0.05 0.84 777.43 0 12:25 0 0 0:00:00 ***************** Node Flow Summary ***************** Node Element Maximum Peak Time of Maximum Time of Peak ID Type Lateral Inflow Peak Inflow Flooding Flooding Inflow Occurrence Overflow Occurrence cfs cfs days hh:mm cfs days hh:mm Out-Post-East OUTFALL 2.90 4.08 0 12:12 0.00 Bioretention Area STORAGE 25.51 25.51 0 12:05 0.00 ******************** Storage Node Summary ******************** Storage Node ID Maximum Maximum Time of Max Average Average Maximum Maximum Time of Max. Total Ponded Ponded Ponded Ponded Ponded Storage Node Exfiltration Exfiltration Exfiltrated Volume Volume Volume Volume Volume Outflow Rate Rate Volume 1000 ft' (%) days hh:mm 1000 ft' (%) cfs cfm hh:mm:ss 1000 ft' Bioretention Area 26.470 58 0 12:25 1.531 3 3.28 45.35 12:25:00 40.518 *********************** Outfall Loading Summary *********************** Autodesk Storm and Sanitary Analysis Outfall Node ID Flow Average Peak Frequency Flow Inflow (6) cfs cfs Out-Post-East 10.47 0.69 4.08 System 10.47 0.69 4.08 Link Flow Summary +++++++++++++++++ Link ID Element Time of Maximum Length Peak Flow Design Ratio of Ratio of Total Reported Type Peak Flow Velocity Factor during Flow Maximum Maximum Time Condition Occurrence Attained Analysis Capacity /Design Flow Surcharged days hh:mm ft/sec cfs cfs Flow Depth minutes Emergency Spillway CHANNEL 0 00:00 0.00 1.00 0.00 343.30 0.00 0.00 0 Calculated Precast Structure ORIFICE 0 12:25 3.28 ++++++++++++++++++++++++++++++++ Highest Flow Instability Indexes All links are stable. WARNING 110 Initial water surface elevation defined for Storage Node Bioretention Area is below storage node invert elevation. Assumed initial water surface elevation equal to invert elevation. Analysis began on: Tue Sep 3 22:18:02 2024 Analysis ended on: Tue Sep 3 22:18:05 2024 Total elapsed time: 00:00:03 Autodesk Storm and Sanitary Analysis