241018_42 ERW_Stormwater Report_compiled

NOAA 24-hr D 10-Year Rainfall=5.22"240924_42 ERW Waymaker Printed 10/17/2024Prepared by Colliers Engineering & Design Page 38HydroCAD® 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 = 3.71" for 10-Year event Inflow = 2.49 cfs @ 12.08 hrs, Volume= 0.214 af Outflow = 2.28 cfs @ 12.12 hrs, Volume= 0.186 af, Atten= 8%, Lag= 2.3 min Primary = 2.28 cfs @ 12.12 hrs, Volume= 0.186 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= 17.21' @ 12.12 hrs Surf.Area= 0.031 ac Storage= 0.062 af Plug-Flow detention time= 165.3 min calculated for 0.186 af (87% of inflow) Center-of-Mass det. time= 101.2 min ( 888.9 - 787.7 ) 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=2.19 cfs @ 12.12 hrs HW=17.18' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.21 cfs @ 6.24 fps) 2=Orifice/Grate (Orifice Controls 1.50 cfs @ 3.83 fps) 3=Sharp-Crested Rectangular Weir (Weir Controls 0.47 cfs @ 1.19 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.