complete drainage report rev 9

POA-2 NOAA 24-hr D 2-Year Rainfall=3.44" 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 101 Summary for Pond 49P: Basin 7 Inflow Area = 165,500 sf, 50.78% Impervious, Inflow Depth = 1.38" for 2-Year event Inflow = 4.44 cfs @ 12.20 hrs, Volume= 19,011 cf Outflow = 0.53 cfs @ 13.31 hrs, Volume= 13,242 cf, Atten= 88%, Lag= 66.6 min Primary = 0.53 cfs @ 13.31 hrs, Volume= 13,242 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= 531.74' @ 13.31 hrs Surf.Area= 15,670 sf Storage= 11,169 cf Plug-Flow detention time= 476.0 min calculated for 13,235 cf (70% of inflow) Center-of-Mass det. time= 368.8 min ( 1,168.4 - 799.6 ) 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=0.53 cfs @ 13.31 hrs HW=531.74' (Free Discharge) 1=Orifice (Orifice Controls 0.53 cfs @ 2.05 fps) Pond 49P: Basin 7 Orifice