Drainage Report

Basdin 2-2 without Exfiltration Proposed Basin 2-2 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 12 Summary for Pond 42P: Pond 2-2 Inflow Area = 1.412 ac, Inflow Depth = 2.51" for 2-Year event Inflow = 3.19 cfs @ 12.17 hrs, Volume= 0.295 af Outflow = 0.11 cfs @ 16.35 hrs, Volume= 0.099 af, Atten= 96%, Lag= 250.8 min Primary = 0.11 cfs @ 16.35 hrs, Volume= 0.099 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 543.40' @ 16.35 hrs Surf.Area= 7,112 sf Storage= 9,963 cf Plug-Flow detention time= 697.8 min calculated for 0.099 af (33% of inflow) Center-of-Mass det. time= 519.2 min ( 1,305.5 - 786.3 ) Volume Invert Avail.Storage Storage Description #1 542.00' 28,448 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 542.00 7,112 0 0 546.00 7,112 28,448 28,448 Device Routing Invert Outlet Devices #1 Primary 543.20' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 543.75' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=0.11 cfs @ 16.35 hrs HW=543.40' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.11 cfs @ 1.53 fps) 2=Orifice/Grate ( Controls 0.00 cfs)