Drainage Report

Basin 2-1 Proposed Basin 2-1 R5 NOAA 24-hr D 10-Year Rainfall=5.22" Prepared by Anderson Consulting Services Printed 10/29/2023 HydroCAD® 10.20-3f s/n 06666 © 2023 HydroCAD Software Solutions LLC Page 17 Summary for Pond 41P: Pond 2-1 Inflow Area = 0.599 ac, Inflow Depth = 2.76" for 10-Year event Inflow = 1.62 cfs @ 12.18 hrs, Volume= 0.138 af Outflow = 0.44 cfs @ 12.57 hrs, Volume= 0.094 af, Atten= 73%, Lag= 23.4 min Primary = 0.44 cfs @ 12.57 hrs, Volume= 0.094 af Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 547.31' @ 12.57 hrs Surf.Area= 2,020 sf Storage= 2,643 cf Plug-Flow detention time= 239.7 min calculated for 0.094 af (68% of inflow) Center-of-Mass det. time= 132.1 min ( 972.5 - 840.4 ) 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=0.44 cfs @ 12.57 hrs HW=547.31' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.39 cfs @ 2.04 fps) 2=Orifice/Grate (Orifice Controls 0.05 cfs @ 1.12 fps)