NOAA 24-hr D 2 YR-C Rainfall=3.42" Printed 12/19/2025 Page 49
Analysis - Proposed Conditions NO Prepared by Civil Core Consulting HydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC
Summary for Pond 10P: PERVIOUS PAVEMENT 2B
Inflow Area = 8,276 sf,100.00% Impervious, Inflow Depth = 3.19" for 2 YR-C event Inflow = 0.56 cfs @ 12.12 hrs, Volume= 2,198 cf Outflow = 0.14 cfs @ 12.47 hrs, Volume= 2,194 cf, Atten=76%, Lag=21.0 min Primary = 0.14 cfs @ 12.47 hrs, Volume= 2,194 cf Routed to Pond 33P : INFILTRATION BASIN 2 Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 94.59' @ 12.47 hrs Surf.Area= 6,150 sf Storage= 748 cf Plug-Flow detention time= 111.7 min calculated for 2,193 cf (100% of inflow) Center-of-Mass det. time= 110.8 min (868.7 - 757.9)
VolumeInvertAvail.StorageStorage Description
#193.80'615 cfStone Storage Bed (Prismatic)Listed below (Recalc) 1,538 cf Overall × 40.0% Voids
#294.30'231 cfSurface and Base Course (Prismatic)Listed below (Recalc) 1,538 cf Overall × 15.0% Voids
#394.80'1,538 cfSurface (Prismatic)Listed below (Recalc)
2,383 cfTotal Available Storage
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
93.803,07500
94.303,0751,5381,538
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
94.303,07500
94.803,0751,5381,538
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
94.803,07500
95.303,0751,5381,538
DeviceRoutingInvertOutlet Devices
#1Device 393.80'2.5" Vert. Orifice C = 0.600
#2Device 394.80'48.0" x 48.0" Horiz. Grate C = 0.600
#3Primary92.08'12.0" Round Culvert L = 38.0' RCP, groove end projecting, Ke = 0.200Inlet / Outlet Invert= $ 92.08'/91.65' $ S = 0.0113'/' Cc = 0.900n=0.011, Flow Area=0.79 sf
primary OutFlow Max=0.14 cfs @ 12.47 hrs HW=94.59' TW=91.82' (Dynamic Tailwater) 3=Culvert (Passes 0.14 cfs of 6.12 cfs potential flow) 1=Orifice (Orifice Controls 0.14 cfs @ 3.98 fps) 2=Grate (Controls 0.00 cfs)