102 Sams -REV 12-02-25 NOAA 24-hr D 100-Year Rainfall=9.48" Prepared by Haler Consulting Printed 04/12/2025 HydroCAD® 10.20-2h s/n 10351 © 2024 HydroCAD Software Solutions LLC Page 57
Summary for Pond 144P: WQ Infiltration Basin #1
Inflow Area = 108,596 sf, 29.12% Impervious, Inflow Depth = 3.99" for 100-Year event
Inflow = 7.21 cfs @ 12.11 hrs, Volume= 36,117 cf
Outflow = 0.66 cfs @ 14.19 hrs, Volume= 36,117 cf, Atten= 91%, Lag= 124.7 min
Discarded = 0.49 cfs @ 14.19 hrs, Volume= 34,901 cf
Primary = 0.17 cfs @ 14.19 hrs, Volume= 1,215 cf
Routed to Link 147L : POA
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Peak Elev= 97.79' @ 14.19 hrs Surf.Area= 6,774 sf Storage= 15,241 cf
Plug-Flow detention time= 300.5 min calculated for 36,111 cf (100% of inflow)
Plug-Flow detention time = 300.5 min calculated for 36,111 cf (100% of inflow) Center-of-Mass det. time = 300.5 min (1,100.6 - 800.1)
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 over Surface area
Discarded OutFlow Max=0.49 cfs @ 14.19 hrs HW=97.79' (Free Discharge) 3=Exfiltration (Exfiltration Controls 0.49 cfs)
Primary OutFlow Max=0.17 cfs @ 14.19 hrs HW=97.79' (Free Discharge) 1=Culvert to Subsurface Basin (Inlet Controls 0.17 cfs @ 1.47 fps) 2=Sharp-Crested Rectangular Weir (Passes 0.17 cfs of 5.75 cfs potential flow)