Drainage Report

Basin 3 without exfiltration proposed basin 3 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 28 Summary for Pond 35P: Basin 3 Inflow Area = 2.191 ac, Inflow Depth = 3.37" for 10-Year event Inflow = 6.79 cfs @ 12.17 hrs, Volume= 0.615 af Outflow = 0.87 cfs @ 13.12 hrs, Volume= 0.352 af, Atten= 87%, Lag= 56.9 min Primary = 0.87 cfs @ 13.12 hrs, Volume= 0.352 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 530.77' @ 13.12 hrs Surf.Area= 8,004 sf Storage= 15,712 cf Plug-Flow detention time= 393.9 min calculated for 0.352 af (57% of inflow) Center-of-Mass det. time= 268.4 min ( 1,069.1 - 800.7 ) 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=0.86 cfs @ 13.12 hrs HW=530.77' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.53 cfs @ 2.72 fps) 2=Orifice/Grate (Orifice Controls 0.33 cfs @ 1.32 fps)