VOAA 24-hr D 10 YR-C Rainfall=5.38"
Printed 12/19/2025
Page 173
Analysis - Proposed Conditions NOA
Prepared by Civil Core Consulting
HydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC
Summary for Pond 5P: BIORETENTION BASIN 1A
Inflow Area = 70,567 sf, 24.69% Impervious, Inflow Depth = 1.48" for 10 YR-C event
Inflow = 2.11 cfs @ 12.11 hrs, Volume = 8,722 cf
Outflow = 0.23 cfs @ 13.24 hrs, Volume = 7,216 cf, Atten = 89%, Lag = 67.8 min
Primary = 0.23 cfs @ 13.24 hrs, Volume = 7,216 cf
Routed to Pond 2P : Subsurface Infiltration Basin 1
Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Peak Elev= 92.99' @ 13.24 hrs Surf.Area= 1,500 sf Storage= 4,482 cf
Plug-Flow detention time= 328.3 min calculated for 7,216 cf (83% of inflow)
Center-of-Mass det. time= 241.7 min (1,028.3 - 786.6)
| Volume | Invert | Avail.Storage | Storage Description | |
|---|---|---|---|---|
| #1 | 90.00' | 8,250 cf | Custom Stage Data (Prismatic) | Listed below (Recalc) |
| Elevation (feet) | Surf.Area (sq-ft) | Inc.Store (cubic-feet) | Cum.Store (cubic-feet) | |
| 90.00 | 1,500 | 0 | 0 | |
| 95.50 | 1,500 | 8,250 | 8,250 | |
| Device | Routing | Invert | Outlet Devices |
|---|---|---|---|
| #1 | Device 3 | 91.00' | 2.5" Vert. Orifice C = 0.600 Limited to weir flow at low heads |
| #2 | Device 3 | 95.00' | 48.0" x 48.0" Horiz. Grate C = 0.600 Limited to weir flow at low heads |
| #3 | Primary | 87.48' | 12.0" Round Culvert\n L = 28.0' RCP, groove end projecting, Ke = 0.200\nInlet / Outlet Invert= 87.48' / 87.00' S = 0.0171' /' Cc = 0.900\n n = 0.012 Concrete pipe, finished, Flow Area= 0.79 sf |
| Primary OutFlow Max=0.23 cfs @ 13.24 hrs HW=92.99' TW=87.00' (Dynamic Tailwater) 3=Culvert (Passes 0.23 cfs of 10.08 cfs potential flow) 1=Orifice (Orifice Controls 0.23 cfs @ 6.61 fps) 2=Grate ( Controls 0.00 cfs) | |||
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Culvert