Drainage Report

Basin 5 witout exfiltration Proposed basin 5 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 24P: Infiltration basin 5 Inflow Area = 2.275 ac, Inflow Depth = 7.34" for 100-Year event Inflow = 14.33 cfs @ 12.18 hrs, Volume= 1.392 af Outflow = 2.86 cfs @ 12.69 hrs, Volume= 0.851 af, Atten= 80%, Lag= 30.3 min Primary = 2.86 cfs @ 12.69 hrs, Volume= 0.851 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.03 hrs Peak Elev= 573.29' @ 12.69 hrs Surf.Area= 12,410 sf Storage= 34,562 cf Plug-Flow detention time= 311.3 min calculated for 0.851 af (61% of inflow) Center-of-Mass det. time= 189.8 min ( 958.1 - 768.3 ) Volume Invert Avail.Storage Storage Description #1 570.50' 43,435 cf Custom Stage Data (Conic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store Wet.Area (feet) (sq-ft) (cubic-feet) (cubic-feet) (sq-ft) 570.50 12,410 0 0 12,410 574.00 12,410 43,435 43,435 13,792 Device Routing Invert Outlet Devices #1 Primary 572.40' 18.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=2.86 cfs @ 12.69 hrs HW=573.29' (Free Discharge) 1=Orifice/Grate (Orifice Controls 2.86 cfs @ 3.81 fps)