Drainage Report

Basin 2-1 Proposed Basin 2-1 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 11 Summary for Pond 41P: Pond 2-1 Inflow Area = 0.599 ac, Inflow Depth = 1.36" for 2-Year event Inflow = 0.79 cfs @ 12.18 hrs, Volume= 0.068 af Outflow = 0.04 cfs @ 16.51 hrs, Volume= 0.024 af, Atten= 95%, Lag= 259.5 min Primary = 0.04 cfs @ 16.51 hrs, Volume= 0.024 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 547.05' @ 16.51 hrs Surf.Area= 2,020 sf Storage= 2,121 cf Plug-Flow detention time= 503.1 min calculated for 0.024 af (35% of inflow) Center-of-Mass det. time= 355.4 min ( 1,217.1 - 861.6 ) Volume Invert Avail.Storage Storage Description #1 546.00' 4,040 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 546.00 2,020 0 0 548.00 2,020 4,040 4,040 Device Routing Invert Outlet Devices #1 Primary 546.95' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 547.20' 10.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.04 cfs @ 16.51 hrs HW=547.05' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.04 cfs @ 1.08 fps) 2=Orifice/Grate ( Controls 0.00 cfs)