Drainage Report

Basin 2-6 without exfiltration Proposed basin 2-6 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 37P: Pond 2-6 Inflow Area = 1.842 ac, Inflow Depth = 8.42" for 100-Year event Inflow = 13.04 cfs @ 12.17 hrs, Volume= 1.292 af Outflow = 1.27 cfs @ 13.29 hrs, Volume= 0.966 af, Atten= 90%, Lag= 67.5 min Primary = 1.27 cfs @ 13.29 hrs, Volume= 0.966 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 543.84' @ 13.29 hrs Surf.Area= 10,782 sf Storage= 36,022 cf Plug-Flow detention time= 438.5 min calculated for 0.966 af (75% of inflow) Center-of-Mass det. time= 341.7 min ( 1,086.4 - 744.7 ) Volume Invert Avail.Storage Storage Description #1 540.50' 37,737 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 540.50 10,782 0 0 544.00 10,782 37,737 37,737 Device Routing Invert Outlet Devices #1 Primary 541.80' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.27 cfs @ 13.29 hrs HW=543.84' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.27 cfs @ 6.44 fps)