Drainage Report

Basin 2-3 without exfiltration Proposed Basin 2-3 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 14 Summary for Pond 44P: pond 2-3 Inflow Area = 2.259 ac, Inflow Depth = 2.30" for 2-Year event Inflow = 4.65 cfs @ 12.18 hrs, Volume= 0.434 af Outflow = 0.15 cfs @ 17.25 hrs, Volume= 0.144 af, Atten= 97%, Lag= 304.5 min Primary = 0.15 cfs @ 17.25 hrs, Volume= 0.144 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 543.43' @ 17.25 hrs Surf.Area= 10,412 sf Storage= 14,908 cf Plug-Flow detention time= 761.1 min calculated for 0.144 af (33% of inflow) Center-of-Mass det. time= 586.3 min ( 1,380.9 - 794.6 ) Volume Invert Avail.Storage Storage Description #1 542.00' 41,648 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 10,412 0 0 546.00 10,412 41,648 41,648 Device Routing Invert Outlet Devices #1 Primary 543.20' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 543.75' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.15 cfs @ 17.25 hrs HW=543.43' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.15 cfs @ 1.64 fps) 2=Orifice/Grate ( Controls 0.00 cfs)