complete drainage report rev 9

POA-2 2024-05-12 HydroCad - Proposed POA 2B-1 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 187 Summary for Pond 41P: Basin 10 Inflow Area = 90,349 sf, 58.79% Impervious, Inflow Depth = 4.01" for 10-Year event Inflow = 7.31 cfs @ 12.18 hrs, Volume= 30,212 cf Outflow = 3.14 cfs @ 12.38 hrs, Volume= 30,212 cf, Atten= 57%, Lag= 12.3 min Discarded = 2.22 cfs @ 11.96 hrs, Volume= 28,927 cf Primary = 0.93 cfs @ 12.38 hrs, Volume= 1,285 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= 576.44' @ 12.38 hrs Surf.Area= 9,583 sf Storage= 4,207 cf Plug-Flow detention time= 8.1 min calculated for 30,197 cf (100% of inflow) Center-of-Mass det. time= 8.1 min ( 786.5 - 778.4 ) 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 @ 11.96 hrs HW=576.03' (Free Discharge) 3=Exfiltration (Exfiltration Controls 2.22 cfs) Primary OutFlow Max=0.92 cfs @ 12.38 hrs HW=576.44' (Free Discharge) 1=Orifice/Grate ( Controls 0.00 cfs) 2=Orifice/Grate (Orifice Controls 0.92 cfs @ 1.39 fps) Pond 41P: Basin 10 Orifice/Grate Orifice/Grate Exfiltration