Drainage Report

Basin 3 without exfiltration proposed basin 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 15 Summary for Pond 35P: Basin 3 Inflow Area = 2.191 ac, Inflow Depth = 1.88" for 2-Year event Inflow = 3.73 cfs @ 12.17 hrs, Volume= 0.343 af Outflow = 0.09 cfs @ 20.28 hrs, Volume= 0.080 af, Atten= 98%, Lag= 486.3 min Primary = 0.09 cfs @ 20.28 hrs, Volume= 0.080 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 530.38' @ 20.28 hrs Surf.Area= 7,314 sf Storage= 12,717 cf Plug-Flow detention time= 853.2 min calculated for 0.080 af (23% of inflow) Center-of-Mass det. time= 638.4 min ( 1,446.6 - 808.2 ) Volume Invert Avail.Storage Storage Description #1 528.00' 26,911 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 528.00 3,437 0 0 530.00 6,648 10,085 10,085 532.00 10,178 16,826 26,911 Device Routing Invert Outlet Devices #1 Primary 530.20' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 530.60' 18.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.09 cfs @ 20.28 hrs HW=530.38' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.09 cfs @ 1.43 fps) 2=Orifice/Grate ( Controls 0.00 cfs)