Drainage Report

Basin 2-5 without exfiltration Proposed Basin 2-5 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 33 Summary for Pond 39P: pond 2-5 Inflow Area = 1.650 ac, Inflow Depth = 8.42" for 100-Year event Inflow = 11.68 cfs @ 12.17 hrs, Volume= 1.158 af Outflow = 1.16 cfs @ 13.26 hrs, Volume= 0.888 af, Atten= 90%, Lag= 65.6 min Primary = 1.16 cfs @ 13.26 hrs, Volume= 0.888 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 543.27' @ 13.26 hrs Surf.Area= 11,558 sf Storage= 31,977 cf Plug-Flow detention time= 438.9 min calculated for 0.888 af (77% of inflow) Center-of-Mass det. time= 346.1 min ( 1,090.8 - 744.7 ) 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=1.16 cfs @ 13.26 hrs HW=543.27' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.16 cfs @ 5.93 fps)