complete drainage report rev 9

POA-2 NOAA 24-hr D 10-Year Rainfall=5.22" 2024-05-12 HydroCad - Proposed POA 2B-1 Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 205 Summary for Pond 49P: Basin 7 Inflow Area = 165,500 sf, 50.78% Impervious, Inflow Depth = 2.37" for 10-Year event Inflow = 7.67 cfs @ 12.20 hrs, Volume= 32,740 cf Outflow = 1.73 cfs @ 12.69 hrs, Volume= 26,967 cf, Atten= 77%, Lag= 29.6 min Primary = 1.73 cfs @ 12.69 hrs, Volume= 26,967 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= 532.09' @ 12.69 hrs Surf.Area= 16,282 sf Storage= 16,775 cf Plug-Flow detention time= 332.7 min calculated for 26,967 cf (82% of inflow) Center-of-Mass det. time= 253.4 min ( 1,045.3 - 791.8 ) Volume #1 Invert 531.00' Elevation (feet) 531.00 532.00 533.00 534.00 Device #1 Avail.Storage 50,966 cf Surf.Area (sq-ft) 14,375 16,117 17,860 19,602 Routing Primary Invert 531.38' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 15,246 16,989 18,731 Cum.Store (cubic-feet) 0 15,246 32,235 50,966 Outlet Devices 12.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.73 cfs @ 12.69 hrs HW=532.09' (Free Discharge) 1=Orifice (Orifice Controls 1.73 cfs @ 2.88 fps) Pond 49P: Basin 7 Orifice