Drainage Report

Basin 2-3 without exfiltration Proposed Basin 2-3 R5 NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 36 Summary for Pond 44P: pond 2-3 Inflow Area = 2.259 ac, Inflow Depth = 7.19" for 100-Year event Inflow = 14.34 cfs @ 12.18 hrs, Volume= 1.353 af Outflow = 2.26 cfs @ 12.85 hrs, Volume= 1.063 af, Atten= 84%, Lag= 40.5 min Primary = 2.26 cfs @ 12.85 hrs, Volume= 1.063 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 545.17' @ 12.85 hrs Surf.Area= 10,412 sf Storage= 32,959 cf Plug-Flow detention time= 325.2 min calculated for 1.063 af (79% of inflow) Center-of-Mass det. time= 239.4 min ( 1,015.4 - 776.0 ) 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=2.26 cfs @ 12.85 hrs HW=545.17' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.24 cfs @ 6.31 fps) 2=Orifice/Grate (Orifice Controls 1.02 cfs @ 5.20 fps)