Drainage Report

Basdin 2-2 without Exfiltration Proposed Basin 2-2 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 24 Summary for Pond 42P: Pond 2-2 Inflow Area = 1.412 ac, Inflow Depth = 7.49" for 100-Year event Inflow = 9.35 cfs @ 12.17 hrs, Volume= 0.881 af Outflow = 2.02 cfs @ 12.62 hrs, Volume= 0.684 af, Atten= 78%, Lag= 26.8 min Primary = 2.02 cfs @ 12.62 hrs, Volume= 0.684 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 544.88' @ 12.62 hrs Surf.Area= 7,112 sf Storage= 20,478 cf Plug-Flow detention time= 288.3 min calculated for 0.684 af (78% of inflow) Center-of-Mass det. time= 200.4 min ( 968.8 - 768.5 ) 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=2.02 cfs @ 12.62 hrs HW=544.88' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.13 cfs @ 5.76 fps) 2=Orifice/Grate (Orifice Controls 0.89 cfs @ 4.51 fps)