Revised Stormwater Management Report

PA-3 Existing and Proposed 2024-05-12 HydroCad - Proposed 11-12 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 6/13/2024 Page 7 HydroCAD® 10.20-5a s/n 06666 © 2023 HydroCAD Software Solutions LLC Summary for Pond 30: Basin 12 Inflow Area = Inflow = Outflow = Discarded = 0.178 ac, 32.25% Impervious, Inflow Depth = 1.85" for 2-Year event 0.38 cfs @ 12.12 hrs, Volume= 0.027 af 0.08 cfs @ 11.88 hrs, Volume= 0.027 af, Atten= 78%, Lag= 0.0 min 0.08 cfs @ 11.88 hrs, Volume= 0.027 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 594.60' @ 12.39 hrs Surf.Area= 900 sf Storage= 215 cf Plug-Flow detention time= 14.7 min calculated for 0.027 af (100% of inflow) Center-of-Mass det. time= 14.7 min ( 819.5 - 804.8 ) Volume #1 Invert 594.00' Avail.Storage 1,724 cf #2 596.00' 151 cf 1,874 cf Elevation (feet) 594.00 599.00 Device #1 Surf.Area (sq-ft) 900 900 Routing Discarded Invert 594.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 4,500 cf Overall - 191 cf Embedded = 4,309 cf x 40.0% Voids 8.00'D x 3.00'H Vertical Cone/Cylinder Inside #1 191 cf Overall - 6.0" Wall Thickness = 151 cf Total Available Storage Inc.Store (cubic-feet) 0 4,500 Cum.Store (cubic-feet) 0 4,500 Outlet Devices 4.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.08 cfs @ 11.88 hrs HW=594.05' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.08 cfs)