102 Sams -REV 12-02-25 NOAA 24-hr D 25-Year Rainfall=6.68" Prepared by Haler Consulting Printed 04/12/2025 HydroCAD® 10.20-2h s/n 10351 © 2024 HydroCAD Software Solutions LLC Page 42
Summary for Pond 183P: WQ Infiltration Basin #1
Inflow Area = 108,596 sf, 29.12% Impervious, Inflow Depth = 2.34" for 25-Year event
Inflow = 4.63 cfs @ 12.11 hrs, Volume= 21,191 cf
Outflow = 5.91 cfs @ 12.12 hrs, Volume= 17,388 cf, Atten= 0%, Lag= 0.5 min
Discarded = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Primary = 5.91 cfs @ 12.12 hrs, Volume= 17,388 cf
Routed to Link 185L : POA
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 97.00' Surf.Area= 6,008 sf Storage= 10,212 cf Peak Elev= 99.23' @ 12.12 hrs Surf.Area= 6,981 sf Storage= 16,706 cf (6,495 cf above start)
Plug-Flow detention time= 627.7 min calculated for 7,176 cf (34% of inflow)
Plug-Flow detention time= 627.7 min calculated for 7,176 cf (34% of inflow) Center-of-Mass det. time= 157.8 min (947.5 - 789.7)
VolumeInvertAvail.StorageStorage Description
#195.00'16,706 cfCustom Stage Data (Prismatic) Listed below (Recalc)
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
95.004,23100
96.005,0924,6624,662
97.006,0085,55010,212
98.006,9816,49516,706
DeviceRoutingInvertOutlet Devices
#1Primary97.60'15.0" Round Culvert to Subsurface Basin L= 35.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 95.00' / 97.60' S= -0.0743'' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 1.23 sf
#2Device 197.00'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
#3Discarded95.00'3.100 in/hr Exfiltration X 0.00 over Surface area
Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=97.00' (Free Discharge) 3=Exfiltration (Controls 0.00 cfs)
Primary OutFlow Max=5.86 cfs @ 12.12 hrs HW=99.21' (Free Discharge) 1=Culvert to Subsurface Basin (Inlet Controls 5.86 cfs @ 4.77 fps) 2=Sharp-Crested Rectangular Weir (Passes 5.86 cfs of 36.01 cfs potential flow)