Drainage Report

Basin 2-4 without exfiltration Proposed Basin 2-4 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 43P: pond 2-4 Inflow Area = 2.205 ac, Inflow Depth = 6.65" for 100-Year event Inflow = 13.54 cfs @ 12.17 hrs, Volume= 1.223 af Outflow = 2.06 cfs @ 12.88 hrs, Volume= 0.989 af, Atten= 85%, Lag= 42.7 min Primary = 2.06 cfs @ 12.88 hrs, Volume= 0.989 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 544.61' @ 12.88 hrs Surf.Area= 11,090 sf Storage= 28,898 cf Plug-Flow detention time= 315.5 min calculated for 0.989 af (81% of inflow) Center-of-Mass det. time= 233.6 min ( 1,024.6 - 791.0 ) 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=2.06 cfs @ 12.88 hrs HW=544.61' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.14 cfs @ 5.81 fps) 2=Orifice/Grate (Orifice Controls 0.92 cfs @ 4.71 fps)