102 Sams -REV 12-02-25 NOAA 24-hr D 2-Year Rainfall=3.42" Prepared by Haler Consulting Printed 04/12/2025 HydroCAD® 10.20-2h s/n 10351 © 2024 HydroCAD Software Solutions LLC Page 14
Summary for Pond 184P: WQ Infiltration Basin #2
Inflow Area =86,443 sf,27.15% Impervious,Inflow Depth = 0.87" for 2-Year event
Inflow =1.53 cfs @12.13 hrs,6,261 cf
Outflow =0.10 cfs @13.87 hrs,2,699 cf, Atten= 94%, Lag= 104.6 min
Discarded =0.00 cfs @0.00 hrs,0 cf
Primary =0.10 cfs @13.87 hrs,2,699 cf
Routed to Link 185L : POA
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Starting Elev= 93.00' Surf.Area= 4,067 sf Storage= 6,668 cf Peak Elev= 93.98' @ 13.87 hrs Surf.Area= 4,994 sf Storage= 11,122 cf (4,455 cf above start)
Plug-Flow detention time = (not calculated: initial storage exceeds outflow) Center-of-Mass det. time = 416.3 min (1,177.6 - 761.4)
VolumeInvertAvail.StorageStorage Description
#191.00'13,818 cfCustom Stage Data (Prismatic) Listed below (Recalc)
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
91.002,62800
92.003,3202,9742,974
93.004,0673,6946,668
94.005,0104,53911,206
94.505,4382,61213,818
DeviceRoutingInvertOutlet Devices
#1Primary93.80'6.0" Round Culvert to Subsurface Basin L= 35.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 92.00' / 93.80' S= -0.0514'' Cc= 0.900 n= 0.012 Corrugated PP, smooth interior, Flow Area= 0.20 sf
#2Device 193.00'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
#3Discarded91.00'1.050 in/hr Exfiltration X 0.00 over Surface area
Discarded OutFlow Max=0.00 cfs @ 0.00 hrs HW=93.00' (Free Discharge) 3=Exfiltration (Controls 0.00 cfs)
Primary OutFlow Max=0.10 cfs @ 13.87 hrs HW=93.98' (Free Discharge) 1=Culvert to Subsurface Basin (Inlet Controls 0.10 cfs @ 1.46 fps) 2=Sharp-Crested Rectangular Weir (Passes 0.10 cfs of 7.28 cfs potential flow)