NOAA 24-hr D 10 YR-C Rainfall=5.38" Printed 12/19/2025 ons LLC Page 203
Analysis - Proposed Conditions NOAA Prepared by Civil Core Consulting HydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC
Summary for Pond 33P: INFILTRATION BASIN 2
Inflow Area = 27,007 sf, 30.65% Impervious, Inflow Depth = 1.75" for 10 YR-C event
Inflow = 0.56 cfs @ 12.22 hrs, Volume= 3,938 cf
Outflow = 0.11 cfs @ 14.32 hrs, Volume= 3,938 cf, Atten= 80%, Lag= 126.0 min
Discarded = 0.11 cfs @ 14.32 hrs, Volume= 3,938 cf
Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routed to Link 33L : POA 2
Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Peak Elev= 92.72' @ 14.32 hrs Surf.Area= 971 sf Storage= 790 cf
Plug-Flow detention time= 63.1 min calculated for 3,938 cf (100% of inflow)
Center-of-Mass det. time= 63.1 min ( 926.6 - 863.5 )
Volume Invert Avail.Storage Storage Description
#1 91.65' 4,378 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
91.65 520 0 0
92.00 651 205 205
93.00 1,094 873 1,077
94.00 1,629 1,362 2,439
95.00 2,249 1,939 4,378
Device Routing Invert Outlet Devices
#1 Device 3 93.65' 2.5" Vert. Orifice C= 0.600 Limited to weir flow at low heads
#2 Device 3 94.70' 48.0" x 48.0" Horiz. Grate C= 0.600
#3 Primary 93.65' 12.0" Round Culvert L= 17.0' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 93.65' / 93.50' S= 0.0088''' Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf
#4 Discarded 91.65' 4.950 in/hr Exfiltration over Surface area Phase-In= 0.01'
Discarded OutFlow Max=0.11 cfs @ 14.32 hrs HW=92.72' (Free Discharge)
4=Exfiltration (Exfiltration Controls 0.11 cfs)
Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=91.65' TW=0.00' (Dynamic Tailwater)
3=Culvert ( Controls 0.00 cfs)
1=Orifice ( Controls 0.00 cfs)
2=Grate ( Controls 0.00 cfs)
Pond 33P: INFILTRATION BASIN 2 [F3]