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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 5HydroCAD® 10.00-24 s/n 01574 © 2018 HydroCAD Software Solutions LLC
<br />Summary for Pond CB7: CB 7
<br />Inflow Area = 26,628 sf, 44.60% Impervious, Inflow Depth = 1.31" for 2-Year event
<br />Inflow = 1.18 cfs @ 12.14 hrs, Volume= 2,916 cf
<br />Outflow = 1.18 cfs @ 12.14 hrs, Volume= 2,916 cf, Atten= 0%, Lag= 0.0 min
<br />Primary = 1.18 cfs @ 12.14 hrs, Volume= 2,916 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= 878.20' @ 12.14 hrs Surf.Area= 2 sf Storage= 0 cf
<br />Plug-Flow detention time= (not calculated: outflow precedes inflow)
<br />Center-of-Mass det. time= 0.0 min ( 771.1 - 771.1 )
<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 875.08'15.0" Round Culvert L= 32.0' Ke= 0.500 Inlet / Outlet Invert= 875.08' / 874.58' S= 0.0156 '/' Cc= 0.900
<br />n= 0.012, Flow Area= 1.23 sf
<br />#3 Device 2 878.08'22.2" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads
<br />#4 Device 2 878.08'36.0" W x 6.0" H Vert. Orifice/Grate C= 0.600
<br />Primary OutFlow Max=1.18 cfs @ 12.14 hrs HW=878.20' TW=874.43' (Dynamic Tailwater)
<br />2=Culvert (Passes 1.18 cfs of 9.33 cfs potential flow)
<br />3=Orifice/Grate (Weir Controls 0.78 cfs @ 1.13 fps)
<br />4=Orifice/Grate (Orifice Controls 0.40 cfs @ 1.11 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)
<br />Summary for Pond IESF: IRON ENHANCED SAND FILTER
<br />Inflow Area = 98,668 sf, 40.51% Impervious, Inflow Depth = 1.21" for 2-Year event
<br />Inflow = 3.99 cfs @ 12.14 hrs, Volume= 9,976 cf
<br />Outflow = 0.39 cfs @ 12.80 hrs, Volume= 9,977 cf, Atten= 90%, Lag= 39.5 min
<br />Primary = 0.39 cfs @ 12.80 hrs, Volume= 9,977 cf
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 865.25' @ 12.80 hrs Surf.Area= 5,086 sf Storage= 5,321 cf
<br />Flood Elev= 865.20' Surf.Area= 4,960 sf Storage= 5,046 cf
<br />Plug-Flow detention time= (not calculated: outflow precedes inflow)
<br />Center-of-Mass det. time= 486.0 min ( 1,259.2 - 773.2 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 864.00' 9,750 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 />864.00 3,700 0 0
<br />865.00 4,500 4,100 4,100
<br />866.00 6,800 5,650 9,750
<br />Device Routing Invert Outlet Devices
<br />#1 Primary 864.00'0.800 in/hr FILTRATION over Surface area
<br />#2 Primary 865.20'10.0' long x 5.0' breadth OVERFLOW
<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 5.00 5.50
<br />Coef. (English) 2.34 2.50 2.70 2.68 2.68 2.66 2.65 2.65 2.65 2.65 2.67 2.66 2.68 2.70 2.74 2.79 2.88
<br />Primary OutFlow Max=0.39 cfs @ 12.80 hrs HW=865.25' TW=862.01' (Dynamic Tailwater)
<br />1=FILTRATION (Exfiltration Controls 0.09 cfs)
<br />2=OVERFLOW (Weir Controls 0.30 cfs @ 0.55 fps)
<br />Summary for Pond LA: ADJUSTED LOW AREA
<br />Inflow Area = 152,755 sf, 30.21% Impervious, Inflow Depth = 0.97" for 2-Year event
<br />Inflow = 0.92 cfs @ 12.15 hrs, Volume= 12,400 cf
<br />Outflow = 0.25 cfs @ 13.72 hrs, Volume= 12,303 cf, Atten= 73%, Lag= 93.9 min
<br />Primary = 0.25 cfs @ 13.72 hrs, Volume= 12,303 cf
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