NOAA 24-hr D 2 YR-F Rainfall=4.04" Printed 10/24/2025
Analysis - Proposed Conditions Prepared by Civil Core Consulting HydroCAD® 10.20-7a s/n 13637 © 2025 HydroCAD Software Solutions LLC
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Summary for Pond 39P: Subsurface Basin Lot 2
Inflow Area = 1,850 sf, 100.00% Impervious, Inflow Depth = 3.81" for 2 YR-F event Inflow = 0.18 cfs @ 12.09 hrs, Volume= 587 cf Outflow = 0.07 cfs @ 11.93 hrs, Volume= 587 cf, Atten= 62%, Lag= 0.0 min Discarded = 0.07 cfs @ 11.93 hrs, Volume= 587 cf Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 93.36' @ 12.13 hrs Surf.Area= 0.009 ac Storage= 0.001 af Plug-Flow detention time= 2.5 min calculated for 587 cf (100% of inflow) Center-of-Mass det. time= 2.5 min (750.9 - 748.4)
VolumeInvertAvail.StorageStorage Description
#1A93.00'0.005 af7.65'W x 49.33'L x 2.17'H Field A 0.019 af Overall - 0.005 af Embedded = 0.013 af x 40.0% Voids
#2A93.33'0.004 afADS N-12 15" x 6 Inside #1 Inside = 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside = 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +5.00' x 1.20 sf x 3 rows 6.31' Header x 1.20 sf x 2 = 15.2 cf Inside
0.009 af Total Available Storage
Storage Group A created with Chamber Wizard
DeviceRoutingInvertOutlet Devices
#1Discarded93.00'7.850 in/hr Exfiltration over Surface area
Discarded OutFlowMax=0.07 cfs @ 11.93 hrsHW=93.03' (Free Discharge)
1=Exfiltration (Exfiltration Controls 0.07 cfs)
Pond 39P: Subsurface Basin Lot 2
Exfiltration