complete drainage report rev 9

POA-1 2024-05-12 HydroCad - Proposed POA 1B-1 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services HydroCAD® 10.20-5c s/n 06666 © 2023 HydroCAD Software Solutions LLC Printed 10/25/2024 Page 113 Summary for Pond 16P: Basin 1 Inflow Area = 416,846 sf, 59.40% Impervious, Inflow Depth = 4.82" for 100-Year event Inflow = 41.28 cfs @ 12.20 hrs, Volume= 167,378 cf Outflow = 12.27 cfs @ 12.56 hrs, Volume= 150,907 cf, Atten= 70%, Lag= 21.2 min Primary = 12.27 cfs @ 12.56 hrs, Volume= 150,907 cf Routed to Link 25L : POA 1 Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Peak Elev= 545.30' @ 12.56 hrs Surf.Area= 48,362 sf Storage= 83,095 cf Plug-Flow detention time= 335.1 min calculated for 150,886 cf (90% of inflow) Center-of-Mass det. time= 283.4 min ( 1,055.8 - 772.4 ) Volume #1 Invert 543.50' Elevation (feet) 543.50 544.00 545.00 546.00 547.00 Avail.Storage 170,585 cf Surf.Area (sq-ft) 42,000 45,955 47,156 51,115 54,695 Device #1 Routing Primary Invert 546.00' #2 #3 Primary Primary 543.82' 544.40' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) Inc.Store (cubic-feet) 0 21,989 46,556 49,136 52,905 Cum.Store (cubic-feet) 0 21,989 68,544 117,680 170,585 Outlet Devices 42.0" x 48.0" Horiz. Grate C= 0.600 Limited to weir flow at low heads 10.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads 48.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=12.27 cfs @ 12.56 hrs HW=545.30' (Free Discharge) 1=Grate ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 2.71 cfs @ 4.98 fps) 3=Orifice/Grate (Orifice Controls 9.56 cfs @ 3.58 fps) Pond 16P: Basin 1 Grate Orifice/Grate Orifice