Drainage Report

Basin 2-6 without exfiltration Proposed basin 2-6 R5 NOAA 24-hr D 2-Year Rainfall=3.44" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 13 Summary for Pond 37P: Pond 2-6 Inflow Area = 1.842 ac, Inflow Depth = 3.21" for 2-Year event Inflow = 5.13 cfs @ 12.17 hrs, Volume= 0.492 af Outflow = 0.18 cfs @ 15.80 hrs, Volume= 0.167 af, Atten= 96%, Lag= 217.8 min Primary = 0.18 cfs @ 15.80 hrs, Volume= 0.167 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 542.06' @ 15.80 hrs Surf.Area= 10,782 sf Storage= 16,822 cf Plug-Flow detention time= 738.3 min calculated for 0.167 af (34% of inflow) Center-of-Mass det. time= 551.4 min ( 1,311.9 - 760.4 ) 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=0.18 cfs @ 15.80 hrs HW=542.06' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.18 cfs @ 1.74 fps)