NOAA 24-hr D 100 YR-C Rainfall=9.48"
Printed 12/19/2025
tions LLC Page 321
Analysis - Proposed Conditions
Prepared by Civil Core Consulting
HydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC
Summary for Pond 6P: BIORENTION BASIN 2A
Inflow Area = 18,731 sf, 0.00% Impervious, Inflow Depth = 1.83" for 100 YR-C event
Inflow = 0.49 cfs @ 12.19 hrs, Volume= 2,863 cf
Outflow = 0.49 cfs @ 12.19 hrs, Volume= 2,817 cf, Atten= 0%, Lag= 0.0 min
Primary = 0.49 cfs @ 12.19 hrs, Volume= 2,817 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
Peak Elev= 95.54' @ 12.19 hrs Surf.Area= 240 sf Storage= 178 cf
Plug-Flow detention time= 22.1 min calculated for 2,817 cf (98% of inflow)
Center-of-Mass det. time= 13.4 min ( 930.6 - 917.2 )
| 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=0.49 cfs @ 12.19 hrs HW=95.54' TW=93.01' (Dynamic Tailwater) 3=Culvert (Passes 0.49 cfs of 7.07 cfs potential flow) 1=Orifice (Orifice Controls 0.13 cfs @ 3.83 fps) 2=Grate (Weir Controls 0.36 cfs @ 0.62 fps) | ||||
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