NOAA 24-hr D 100 YR-C Rainfall=9.48" Printed 12/19/2025 tions LLC Page 351
Analysis - Proposed Conditions NOAA 2 Prepared by Civil Core Consulting HydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC
Summary for Pond 42P: BIORENTION BASIN 3A
Inflow Area = 29,621 sf, 0.00% Impervious, Inflow Depth = 1.83" for 100 YR-C event Inflow = 0.66 cfs @ 12.24 hrs, Volume = 4,528 cf Outflow = 0.60 cfs @ 12.38 hrs, Volume = 4,429 cf, Atten = 10%, Lag = 8.4 min Primary = 0.60 cfs @ 12.38 hrs, Volume = 4,429 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 Peak Elev= 94.54' @ 12.38 hrs Surf.Area= 907 sf Storage= 532 cf Plug-Flow detention time= 46.6 min calculated for 4,428 cf (98% of inflow) Center-of-Mass det. time= 35.2 min ( 956.8 - 921.5 )
VolumeInvertAvail.StorageStorage Description
#193.30'1,041 cfCustom Stage Data (Prismatic)Listed below (Recalc)
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
93.307700
94.00417173173
95.001,3198681,041
DeviceRoutingInvertOutlet Devices
#1Device 393.80'2.5" Vert. Orifice C= 0.600 Limited to weir flow at low heads
#2Device 394.50'48.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads
#3Primary90.80'12.0" 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=0.60 cfs @ 12.38 hrs HW=94.54' TW=92.01' (Dynamic Tailwater) 3=Culvert (Passes 0.60 cfs of 7.52 cfs potential flow) 1=Orifice (Orifice Controls 0.13 cfs @ 3.85 fps) 2=Grate (Weir Controls 0.47 cfs @ 0.68 fps)