Analysis - Failure NOAA 24-hr D 10 YR-C Rainfall=5.38"
Prepared by Civil Core Consulting Printed 12/19/2025
HydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC Page 174
Summary for Pond 42P: BIORENTION BASIN 3A
Inflow Area = 35,171 sf, 15.78% Impervious, Inflow Depth = 1.05" for 10 YR-C event
Inflow = 0.72 cfs @ 12.09 hrs, Volume= 3,078 cf
Outflow = 0.71 cfs @ 12.10 hrs, Volume= 2,978 cf, Atten= 1%, Lag= 0.4 min
Primary = 0.71 cfs @ 12.10 hrs, Volume= 2,978 cf
Routed to Pond 8P : INFILTRATION BASIN 3
Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 3
Peak Elev= 94.55' @ 12.10 hrs Surf.Area= 913 sf Storage= 538 cf
Plug-Flow detention time= 80.8 min calculated for 2,978 cf (97% of inflow)
Center-of-Mass det. time= 60.8 min ( 867.4 - 806.6 )
| Volume | Invert | Avail.Storage | Storage Description | |
|---|---|---|---|---|
| #1 | 93.30' | 1,041 cf | Custom Stage Data (Prismatic) | Listed below (Recalc) |
| Elevation (feet) | Surf.Area (sq-ft) | Inc.Store (cubic-feet) | Cum.Store (cubic-feet) | |
| 93.30 | 77 | 0 | 0 | |
| 94.00 | 417 | 173 | 173 | |
| 95.00 | 1,319 | 868 | 1,041 | |
| Device | Routing | Invert | Outlet Devices | |
| #1 | Device 3 | 93.80' | 2.5" Vert. Orifice C= 0.600 Limited to weir flow at low heads | |
| #2 | Device 3 | 94.50' | 48.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads | |
| #3 | Primary | 90.80' | 12.0" Round Culvert L= 11.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 90.80' / 90.75' S= 0.0045'' Cc= 0.900 n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf | |
| Primary OutFlow Max=0.70 cfs @ 12.10 hrs HW=94.55' TW=93.34' (Dynamic Tailwater) 3=Culvert (Passes 0.70 cfs of 5.19 cfs potential flow) 1=Orifice (Orifice Controls 0.13 cfs @ 3.87 fps) 2=Grate (Weir Controls 0.57 cfs @ 0.73 fps) | ||||
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