Drainage Report

Basin 2-4 without exfiltration Proposed Basin 2-4 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 43P: pond 2-4 Inflow Area = 2.205 ac, Inflow Depth = 1.93" for 2-Year event Inflow = 3.93 cfs @ 12.18 hrs, Volume= 0.354 af Outflow = 0.11 cfs @ 17.96 hrs, Volume= 0.121 af, Atten= 97%, Lag= 347.0 min Primary = 0.11 cfs @ 17.96 hrs, Volume= 0.121 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 543.10' @ 17.96 hrs Surf.Area= 11,090 sf Storage= 12,214 cf Plug-Flow detention time= 777.8 min calculated for 0.121 af (34% of inflow) Center-of-Mass det. time= 613.5 min ( 1,428.5 - 815.0 ) Volume Invert Avail.Storage Storage Description #1 542.00' 44,360 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 11,090 0 0 546.00 11,090 44,360 44,360 Device Routing Invert Outlet Devices #1 Primary 542.90' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 543.40' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.11 cfs @ 17.96 hrs HW=543.10' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.11 cfs @ 1.53 fps) 2=Orifice/Grate ( Controls 0.00 cfs)