Drainage Report

Basin 2-5 without exfiltration Proposed Basin 2-5 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 23 Summary for Pond 39P: pond 2-5 Inflow Area = 1.650 ac, Inflow Depth = 4.98" for 10-Year event Inflow = 7.02 cfs @ 12.17 hrs, Volume= 0.685 af Outflow = 0.64 cfs @ 13.37 hrs, Volume= 0.415 af, Atten= 91%, Lag= 72.0 min Primary = 0.64 cfs @ 13.37 hrs, Volume= 0.415 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 542.21' @ 13.37 hrs Surf.Area= 11,558 sf Storage= 19,784 cf Plug-Flow detention time= 486.9 min calculated for 0.415 af (61% of inflow) Center-of-Mass det. time= 365.6 min ( 1,117.8 - 752.2 ) Volume Invert Avail.Storage Storage Description #1 540.50' 40,453 cf 540 (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 540.50 11,558 0 0 544.00 11,558 40,453 40,453 Device Routing Invert Outlet Devices #1 Primary 541.50' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.64 cfs @ 13.37 hrs HW=542.21' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.64 cfs @ 3.27 fps)