complete drainage report rev 9

POA-3 NOAA 24-hr D 2-Year Rainfall=3.44" 2024-05-12 HydroCad - Proposed POA 3B Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 12 Summary for Pond 29P: 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 0.21 cfs @ 12.03 hrs, Volume= 0.027 af, Atten= 45%, Lag= 0.0 min 0.21 cfs @ 12.03 hrs, Volume= 0.027 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 596.18' @ 12.18 hrs Surf.Area= 900 sf Storage= 69 cf Plug-Flow detention time= 1.5 min calculated for 0.027 af (100% of inflow) Center-of-Mass det. time= 1.5 min ( 806.3 - 804.8 ) Volume #1 Invert 596.00' Avail.Storage 1,004 cf #2 596.00' 151 cf 1,154 cf Elevation (feet) 596.00 599.00 Device #1 Surf.Area (sq-ft) 900 900 Routing Discarded Invert 596.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 2,700 cf Overall - 191 cf Embedded = 2,509 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 2,700 Cum.Store (cubic-feet) 0 2,700 Outlet Devices 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=0.21 cfs @ 12.03 hrs HW=596.03' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.21 cfs) Pond 29P: Basin 12 Exfiltration