complete drainage report rev 9

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 83 Summary for Pond 41P: Basin 10 Inflow Area = 90,349 sf, 58.79% Impervious, Inflow Depth = 2.40" for 2-Year event Inflow = 4.37 cfs @ 12.18 hrs, Volume= 18,101 cf Outflow = 2.22 cfs @ 12.08 hrs, Volume= 18,101 cf, Atten= 49%, Lag= 0.0 min Discarded = 2.22 cfs @ 12.08 hrs, Volume= 18,101 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routed to Link 28L : POA 2 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 576.17' @ 12.35 hrs Surf.Area= 9,583 sf Storage= 1,586 cf Plug-Flow detention time= 3.9 min calculated for 18,092 cf (100% of inflow) Center-of-Mass det. time= 3.9 min ( 788.7 - 784.9 ) Volume #1 Invert 576.00' Elevation (feet) 576.00 577.00 578.00 579.00 Avail.Storage 28,749 cf Surf.Area (sq-ft) 9,583 9,583 9,583 9,583 Device #1 Routing Primary Invert 577.50' #2 Primary 576.25' #3 Discarded 576.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 9,583 9,583 9,583 Cum.Store (cubic-feet) 0 9,583 19,166 28,749 Outlet Devices 48.0" x 48.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads 42.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads 10.000 in/hr Exfiltration over Surface area Discarded OutFlow Max=2.22 cfs @ 12.08 hrs HW=576.04' (Free Discharge) 3=Exfiltration (Exfiltration Controls 2.22 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=576.00' (Free Discharge) 1=Orifice/Grate ( Controls 0.00 cfs) 2=Orifice/Grate ( Controls 0.00 cfs) Pond 41P: Basin 10 Orifice/Grate Orifice/Grate Exfiltration