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 55HydroCAD® 10.20-4b s/n 04431 © 2023 HydroCAD Software Solutions LLC Summary for Pond Basin 2: (new Pond) Inflow Area = 0.693 ac, 38.96% Impervious, Inflow Depth = 6.95" for 100-Year event Inflow = 4.58 cfs @ 12.09 hrs, Volume= 0.401 af Outflow = 4.52 cfs @ 12.10 hrs, Volume= 0.373 af, Atten= 1%, Lag= 1.0 min Primary = 4.52 cfs @ 12.10 hrs, Volume= 0.373 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= 17.46' @ 12.10 hrs Surf.Area= 0.031 ac Storage= 0.065 af Plug-Flow detention time= 114.8 min calculated for 0.372 af (93% of inflow) Center-of-Mass det. time= 75.7 min ( 852.3 - 776.6 ) Volume Invert Avail.Storage Storage Description #1A 14.00' 0.029 af 34.75'W x 39.22'L x 3.50'H Field A 0.109 af Overall - 0.037 af Embedded = 0.073 af x 40.0% Voids #2A 14.50' 0.037 af ADS_StormTech SC-740 +Cap x 35 Inside #1 Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 35 Chambers in 7 Rows 0.066 af Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 15.40' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 16.30' 6.0" Vert. Orifice/Grate X 2.00 C= 0.600 Limited to weir flow at low heads #3 Primary 17.05' 3.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=4.48 cfs @ 12.10 hrs HW=17.45' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.23 cfs @ 6.72 fps) 2=Orifice/Grate (Orifice Controls 1.80 cfs @ 4.58 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 2.45 cfs @ 2.08 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.