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 156
Summary for Pond 7P: BIORENTION BASIN 2A
Inflow Area = 22,431 sf, 16.50% Impervious, Inflow Depth = 1.08" for 10 YR-C event
Inflow = 0.48 cfs @ 12.09 hrs, Volume= 2,028 cf
Outflow = 0.48 cfs @ 12.09 hrs, Volume= 1,981 cf, Atten= 0%, Lag= 0.0 min
Primary = 0.48 cfs @ 12.09 hrs, Volume= 1,981 cf
Routed to Pond 33P : INFILTRATION BASIN 2
Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs / 3
Peak Elev= 95.54' @ 12.09 hrs Surf.Area= 240 sf Storage= 178 cf
Plug-Flow detention time= 40.9 min calculated for 1,981 cf (98% of inflow)
Center-of-Mass det. time= 26.5 min ( 829.5 - 803.1 )
| Volume | Invert | Avail.Storage | Storage Description | |
|---|---|---|---|---|
| #1 | 94.30' | 307 cf | Custom Stage Data (Prismatic) | Listed below (Recalc) |
| Elevation (feet) | Surf.Area (sq-ft) | Inc.Store (cubic-feet) | Cum.Store (cubic-feet) | |
| 94.30 | 63 | 0 | 0 | |
| 95.00 | 148 | 74 | 74 | |
| 96.00 | 319 | 234 | 307 | |
| Device | Routing | Invert | Outlet Devices | |
| #1 | Device 3 | 94.80' | 2.5" Vert. Orifice C= 0.600 | Limited to weir flow at low heads |
| #2 | Device 3 | 95.50' | 48.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads | |
| #3 | Primary | 91.80' | 12.0" Round Culvert L= 30.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 91.80' / 91.65' S= 0.0050 ' /' Cc= 0.900 n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf | |
| Primary OutFlow Max=0.48 cfs @ 12.09 hrs HW=95.54' TW=94.10' (Dynamic Tailwater) 3=Culvert (Passes 0.48 cfs of 5.33 cfs potential flow) 1=Orifice (Orifice Controls 0.13 cfs @ 3.83 fps) 2=Grate (Weir Controls 0.35 cfs @ 0.62 fps) | ||||
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