241018_42 ERW_Stormwater Report_compiled

NOAA 24-hr D 100-Year Rainfall=8.66"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 52HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Pond Basin 1: (new Pond) Inflow Area = 1.926 ac, 29.96% Impervious, Inflow Depth = 6.81" for 100-Year event Inflow = 12.54 cfs @ 12.10 hrs, Volume= 1.094 af Outflow = 5.92 cfs @ 12.27 hrs, Volume= 1.026 af, Atten= 53%, Lag= 10.3 min Primary = 5.92 cfs @ 12.27 hrs, Volume= 1.026 af Routed to Reach DP1-P : (new Reach) Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs Peak Elev= 18.25' @ 12.27 hrs Surf.Area= 0.121 ac Storage= 0.412 af Plug-Flow detention time= 156.3 min calculated for 1.025 af (94% of inflow) Center-of-Mass det. time= 122.6 min ( 905.8 - 783.2 ) Volume Invert Avail.Storage Storage Description #1A 12.75' 0.169 af 37.08'W x 141.93'L x 5.50'H Field A 0.665 af Overall - 0.243 af Embedded = 0.421 af x 40.0% Voids #2A 13.50' 0.243 af ADS_StormTech MC-3500 d +Cap x 95 Inside #1 Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap 95 Chambers in 5 Rows Cap Storage= 14.9 cf x 2 x 5 rows = 149.0 cf 0.412 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 13.80' 5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 14.80' 6.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 17.50' 1.5' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=5.78 cfs @ 12.27 hrs HW=18.23' (Free Discharge) 1=Orifice/Grate (Orifice Controls 1.35 cfs @ 9.89 fps) 2=Orifice/Grate (Orifice Controls 1.69 cfs @ 8.58 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 2.75 cfs @ 2.79 fps) This document was created by an application that isn’t licensed to use novaPDF. Purchase a license to generate PDF files without this notice.