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MSE 24-hr 3 2-Year Rainfall=2.86"2021-07-20 Pond NEW DESIGN <br /> Printed 7/16/2021Prepared by j <br />Page 6HydroCAD® 10.10-3a s/n 03363 © 2020 HydroCAD Software Solutions LLC <br />Summary for Pond 2P: Stormtech <br />Inflow Area =0.749 ac, 79.61% Impervious, Inflow Depth = 2.38" for 2-Year event <br />Inflow =2.80 cfs @ 12.14 hrs, Volume=0.148 af <br />Outflow =1.44 cfs @ 12.24 hrs, Volume=0.148 af, Atten= 49%, Lag= 5.8 min <br />Primary =1.44 cfs @ 12.24 hrs, Volume=0.148 af <br />Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs <br />Peak Elev= 905.48' @ 12.24 hrs Surf.Area= 1,817 sf Storage= 1,777 cf <br />Plug-Flow detention time= 29.9 min calculated for 0.148 af (100% of inflow) <br />Center-of-Mass det. time= 29.9 min ( 791.2 - 761.3 ) <br />Volume Invert Avail.Storage Storage Description <br />#1A 904.00'1,662 cf 30.00'W x 60.58'L x 3.50'H Field A <br />6,361 cf Overall - 2,205 cf Embedded = 4,155 cf x 40.0% Voids <br />#2A 904.50'2,205 cf ADS_StormTech SC-740 +Cap x 48 Inside #1 <br />Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cf <br />Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap <br />48 Chambers in 6 Rows <br />3,867 cf Total Available Storage <br /> Storage Group A created with Chamber Wizard <br />Device Routing Invert Outlet Devices <br />#1 Primary 903.50'12.0" Round Culvert <br />L= 69.0' RCP, square edge headwall, Ke= 0.500 <br />Inlet / Outlet Invert= 903.50' / 902.29' S= 0.0175 '/' Cc= 0.900 <br />n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf <br />#2 Device 1 904.00'2.000 in/hr Draintile over Surface area <br />#3 Device 1 904.50'8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads <br />#4 Device 1 905.44'8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads <br />#5 Device 1 907.36'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) <br />Primary OutFlow Max=1.44 cfs @ 12.24 hrs HW=905.48' (Free Discharge) <br />1=Culvert (Passes 1.44 cfs of 4.60 cfs potential flow) <br />2=Draintile (Exfiltration Controls 0.08 cfs) <br />3=Orifice/Grate (Orifice Controls 1.35 cfs @ 3.87 fps) <br />4=Orifice/Grate (Orifice Controls 0.01 cfs @ 0.66 fps) <br />5=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs)