NOAA 24-hr D 2 YR-C Rainfall=3.42" Printed 10/24/2025
R-C Rainfall=3.42" Printed 10/24/2025 Page 48
Analysis - Proposed Conditions NOA Prepared by Civil Core Consulting HydroCAD® 10.20-7a s/n 13637 © 2025 HydroCAD Software Solutions LLC
Summary for Pond 41P: Subsurface Basin Lot 9
Inflow Area = 1,850 sf,100.00% Impervious, Inflow Depth = 3.19" for 2 YR-C event Inflow = 0.15 cfs @ 12.09 hrs, Volume= 491 cf Outflow = 0.07 cfs @ 11.94 hrs, Volume= 491 cf, Atten=55%, Lag=0.0 min Discarded = 0.07 cfs @ 11.94 hrs, Volume= 491 cf Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 93.26' @ 12.12 hrs Surf.Area= 0.008 ac Storage= 0.001 af Plug-Flow detention time= 1.6 min calculated for 491 cf (100% of inflow) Center-of-Mass det. time= 1.6 min (753.5 - 751.9)
VolumeInvertAvail.StorageStorage Description
#1A93.00'0.005 af7.65"W x 48.33"L x 2.17"H Field A
0.018 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= +4.00' 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
#1Discarded93.00'8.000 in/hr Exfiltration over Surface area
Discarded OutFlowMax=0.07 cfs @ 11.94 hrsHW=93.02' (Free Discharge)
1=Exfiltration (Exfiltration Controls 0.07 cfs)
Pond 41P: Subsurface Basin Lot 9
Exfiltration