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MSE 24-hr 3 2-Year Rainfall=2.81"2039 Proposed (1-3-2023)
<br /> Printed 1/3/2023Prepared by Plowe Engineering, Inc.
<br />Page 4HydroCAD® 10.00-24 s/n 01574 © 2018 HydroCAD Software Solutions LLC
<br />Summary for Subcatchment S:
<br />Runoff = 0.15 cfs @ 12.23 hrs, Volume= 611 cf, Depth= 0.50"
<br />Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 2-Year Rainfall=2.81"
<br />Area (sf) CN Description
<br />* 1,750 98 New Impervious
<br />7,000 55 Woods, Good, HSG B
<br />6,036 61 >75% Grass cover, Good, HSG B
<br />14,786 Weighted Average
<br />13,036 58 88.16% Pervious Area
<br />1,750 98 11.84% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet) (ft/ft) (ft/sec) (cfs)
<br />13.9 145 0.1444 0.17 Sheet Flow,
<br />Woods: Light underbrush n= 0.400 P2= 2.86"
<br />Summary for Pond 1: PIPE CAPACITY CHECK
<br />Inflow Area = 63,007 sf, 45.29% Impervious, Inflow Depth = 1.32" for 2-Year event
<br />Inflow = 2.81 cfs @ 12.14 hrs, Volume= 6,946 cf
<br />Outflow = 2.81 cfs @ 12.14 hrs, Volume= 6,946 cf, Atten= 0%, Lag= 0.0 min
<br />Primary = 2.81 cfs @ 12.14 hrs, Volume= 6,946 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 874.43' @ 12.14 hrs
<br />Device Routing Invert Outlet Devices
<br />#1 Primary 864.30'18.0" Round Culvert L= 15.0' Ke= 0.500 Inlet / Outlet Invert= 864.30' / 864.00' S= 0.0200 '/' Cc= 0.900
<br />n= 0.012, Flow Area= 1.77 sf
<br />#2 Device 1 873.65'18.0" Round Culvert L= 54.0' Ke= 0.500 Inlet / Outlet Invert= 873.65' / 864.30' S= 0.1731 '/' Cc= 0.900
<br />n= 0.012, Flow Area= 1.77 sf
<br />Primary OutFlow Max=2.80 cfs @ 12.14 hrs HW=874.43' TW=864.76' (Dynamic Tailwater)
<br />1=Culvert (Passes 2.80 cfs of 26.06 cfs potential flow)
<br />2=Culvert (Inlet Controls 2.80 cfs @ 3.01 fps)
<br />Summary for Pond CB6: CBMH 6
<br />Inflow Area = 36,379 sf, 45.80% Impervious, Inflow Depth = 1.33" for 2-Year event
<br />Inflow = 1.63 cfs @ 12.14 hrs, Volume= 4,030 cf
<br />Outflow = 1.63 cfs @ 12.14 hrs, Volume= 4,030 cf, Atten= 0%, Lag= 0.0 min
<br />Primary = 1.63 cfs @ 12.14 hrs, Volume= 4,030 cf
<br />Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 878.23' @ 12.14 hrs Surf.Area= 3 sf Storage= 0 cf
<br />Plug-Flow detention time= 0.0 min calculated for 4,030 cf (100% of inflow)
<br />Center-of-Mass det. time= 0.0 min ( 769.8 - 769.8 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 878.08' 3 cf Custom Stage Data (Prismatic) Listed below (Recalc)
<br />Elevation Surf.Area Inc.Store Cum.Store
<br />(feet) (sq-ft) (cubic-feet) (cubic-feet)
<br />878.08 0 0 0
<br />878.66 10 3 3
<br />Device Routing Invert Outlet Devices
<br />#1 Secondary 878.66'3.0' long x 3.0' breadth Broad-Crested Rectangular Weir
<br />Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50
<br />Coef. (English) 2.44 2.58 2.68 2.67 2.65 2.64 2.64 2.68 2.68 2.72 2.81 2.92 2.97 3.07 3.32
<br />#2 Primary 878.08'22.2" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads
<br />#3 Primary 878.08'36.0" W x 6.0" H Vert. Orifice/Grate C= 0.600
<br />Primary OutFlow Max=1.63 cfs @ 12.14 hrs HW=878.23' TW=874.43' (Dynamic Tailwater)
<br />2=Orifice/Grate (Weir Controls 1.08 cfs @ 1.26 fps)
<br />3=Orifice/Grate (Orifice Controls 0.55 cfs @ 1.23 fps)
<br />Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=878.08' TW=864.30' (Dynamic Tailwater)
<br />1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
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