Drainage Report

Basin 3 without exfiltration proposed basin 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 41 Summary for Pond 35P: Basin 3 Inflow Area = 2.191 ac, Inflow Depth = 6.50" for 100-Year event Inflow = 13.09 cfs @ 12.17 hrs, Volume= 1.188 af Outflow = 4.35 cfs @ 12.44 hrs, Volume= 0.924 af, Atten= 67%, Lag= 16.2 min Primary = 4.35 cfs @ 12.44 hrs, Volume= 0.924 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 531.69' @ 12.44 hrs Surf.Area= 9,634 sf Storage= 23,858 cf Plug-Flow detention time= 242.0 min calculated for 0.923 af (78% of inflow) Center-of-Mass det. time= 154.0 min ( 943.6 - 789.6 ) 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=4.35 cfs @ 12.44 hrs HW=531.69' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.05 cfs @ 5.36 fps) 2=Orifice/Grate (Orifice Controls 3.30 cfs @ 4.40 fps)