SW3231102_Design Calculations_20240430 (3)

Autodesk® Storm and Sanitary Analysis 2016 - Version 13.5.302 (Build 0)
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Project Description
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File Name Bioretention BOA Volume.SPF
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Analysis Options
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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
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Raingage Summary
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Gage Data Data Recording
ID Source Type Interval
min
Rain Gage-01 25-Year CUMULATIVE 6.00
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Subbasin Summary
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Subbasin Total Flow Average Peak Rate Raingage
Area Length Slope Factor
ID acres ft S
Sub-Post-East Not Routed 1.97 500.00 0.5000 484.00 Rain Gage-01
Sub-Post-East Routed 7.64 850.00 1.4700 484.00 Rain Gage-01
Node Summary
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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 776.00 778.00 0.00
Link Summary
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Link From Node To Node Element Length Slope Manning's
ID Type ft % Roughness
Emergency SpillwayBioretention AreaOut-Post-East CHANNEL 85.0 7.3529 0.0180
Precast StructureBioretention AreaOut-Post-East ORIFICE
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Cross Section Summary
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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 1.12 334.50
************************** Volume Depth
Runoff Quantity Continuity acre-ft inches
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Total Precipitation 4.871 6.080
Surface Runoff 0.447 0.557
Continuity Error (6) -0.003
************************** Volume Volume
Flow Routing Continuity acre-ft Mgallons
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External Inflow 0.000 0.000
External Outflow 1.142 0.372
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Initial Stored Volume 0.000 0.000
Final Stored Volume 0.000 0.000
Continuity Error (6) 0.444
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Composite Curve Number Computations Report
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Subbasin Sub-Post-East Not Routed
Area Soil
Soil/Surface Description (acres) Group CN
> 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 CN
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
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Kirpich Time of Concentration Computations Report
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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 (6): 1.47
Computed TOC (minutes): 7.13
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Subbasin Runoff Summary
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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 6.00 1.58 4.57 55.760 0 00:05:00
Sub-Post-East Routed 6.00 3.11 35.41 73.220 0 00:07:07
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Node Depth Summary
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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 0.07 1.18 777.18 0 12:27 0 0 0:00:00
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Node Flow Summary
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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 4.43 7.15 0 12:05 0.00
Bioretention Area STORAGE 33.25 33.25 0 12:00 0.00
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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' (8) days hh:mm 1000 ft' (9) cfs cfm hh:mm:ss 1000 ft'
Bioretention Area 36.073 57 0 12:26 2.149 3 4.15 44.38 12:25:00 45.378
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Outfall Loading Summary
Outfall Node ID Flow Average Peak
Frequency Flow Inflow
(6) cfs cfs
Out-Post-East 10.69 1.08 7.15
System 10.69 1.08 7.15
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 0.00 334.50 0.00 0.00 0 Calculated
Precast Structure ORIFICE 0 12:27 4.15
Highest Flow Instability Indexes
All links are stable.
Analysis began on: Mon Apr 29 20:49:41 2024
Analysis ended on: Mon Apr 29 20.49.44 2024
Total elapsed time: 00:00:03
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