complete drainage report rev 9

POA-2 2024-05-12 HydroCad - Proposed POA 2B-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 303 Summary for Pond 48P: Basin 8 Inflow Area = 61,044 sf, 62.67% Impervious, Inflow Depth = 7.47" for 100-Year event Inflow = 9.79 cfs @ 12.16 hrs, Volume= 38,015 cf Outflow = 4.41 cfs @ 12.32 hrs, Volume= 38,015 cf, Atten= 55%, Lag= 9.7 min Discarded = 3.73 cfs @ 12.32 hrs, Volume= 36,926 cf Primary = 0.68 cfs @ 12.32 hrs, Volume= 1,089 cf Routed to Pond 49P : Basin 7 Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.04 hrs Peak Elev= 574.22' @ 12.32 hrs Surf.Area= 10,019 sf Storage= 4,871 cf Plug-Flow detention time= 5.7 min calculated for 37,996 cf (100% of inflow) Center-of-Mass det. time= 5.7 min ( 770.6 - 764.9 ) Volume #1 Invert 573.00' Elevation (feet) 573.00 574.00 575.00 576.00 Device #1 #2 #3 Avail.Storage 12,023 cf Surf.Area (sq-ft) 10,019 10,019 10,019 10,019 Routing Primary Primary Discarded Invert 575.00' 573.45' 573.00' Storage Description Custom Stage Data (Prismatic) Listed below (Recalc) 30,057 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 10,019 10,019 10,019 Cum.Store (cubic-feet) 0 10,019 20,038 30,057 Outlet Devices 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads 10.000 in/hr Exfiltration over Surface area Conductivity to Groundwater Elevation = 571.00' Discarded OutFlow Max=3.73 cfs @ 12.32 hrs HW=574.21' (Free Discharge) 3=Exfiltration ( Controls 3.73 cfs) Primary OutFlow Max=0.68 cfs @ 12.32 hrs HW=574.21' (Free Discharge) 1=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs) 2=Orifice (Orifice Controls 0.68 cfs @ 3.45 fps) Pond 48P: Basin 8 Sharp-Crested Rectangular Weir Orifice Exfiltration