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MSE 24-hr 3 100-Year Rainfall=7.32"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 21HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Area (ac) CN Description
<br />0.269 70 Woods, Good, HSG C
<br />*0.011 98
<br />0.280 71 Weighted Average
<br />0.269 70 96.07% Pervious Area
<br />0.011 98 3.93% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />9.0 Direct Entry,
<br />Summary for Reach 1R: Proposed to Offsite
<br />Inflow Area =18.107 ac, 13.16% Impervious, Inflow Depth = 4.29" for 100-Year event
<br />Inflow =75.85 cfs @ 12.26 hrs, Volume=6.469 af
<br />Outflow =75.85 cfs @ 12.26 hrs, Volume=6.469 af, Atten= 0%, Lag= 0.0 min
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Summary for Pond CB3: Inlet at street
<br />Inflow Area =2.961 ac, 13.54% Impervious, Inflow Depth = 4.32" for 100-Year event
<br />Inflow =15.05 cfs @ 12.26 hrs, Volume=1.066 af
<br />Outflow =15.05 cfs @ 12.26 hrs, Volume=1.065 af, Atten= 0%, Lag= 0.1 min
<br />Primary =15.05 cfs @ 12.26 hrs, Volume=1.065 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 961.99' @ 12.26 hrs Surf.Area= 50 sf Storage= 70 cf
<br />Plug-Flow detention time= 1.1 min calculated for 1.065 af (100% of inflow)
<br />Center-of-Mass det. time= 0.6 min ( 801.1 - 800.5 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 958.00'861 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 />958.00 13 0 0
<br />961.00 13 39 39
<br />962.00 50 32 71
<br />963.00 440 245 316
<br />964.00 650 545 861
<br />Device Routing Invert Outlet Devices
<br />#1 Primary 958.00'18.0" Round Culvert L= 60.0' Ke= 0.500
<br />Inlet / Outlet Invert= 958.00' / 957.00' S= 0.0167 '/' Cc= 0.900
<br />n= 0.013, Flow Area= 1.77 sf
<br />#2 Device 1 961.00'24.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads
<br />MSE 24-hr 3 100-Year Rainfall=7.32"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 22HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Primary OutFlow Max=15.05 cfs @ 12.26 hrs HW=961.99' TW=0.00' (Dynamic Tailwater)
<br />1=Culvert (Passes 15.05 cfs of 15.31 cfs potential flow)
<br />2=Orifice/Grate (Orifice Controls 15.05 cfs @ 4.79 fps)
<br />Summary for Pond P1i: Infiltration Basin 1
<br />Inflow Area =5.329 ac, 26.82% Impervious, Inflow Depth = 4.74" for 100-Year event
<br />Inflow =28.52 cfs @ 12.26 hrs, Volume=2.106 af
<br />Outflow =19.69 cfs @ 12.41 hrs, Volume=2.106 af, Atten= 31%, Lag= 9.0 min
<br />Discarded =0.05 cfs @ 12.41 hrs, Volume=0.211 af
<br />Primary =19.64 cfs @ 12.41 hrs, Volume=1.895 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 953.58' @ 12.41 hrs Surf.Area= 8,921 sf Storage= 24,997 cf
<br />Plug-Flow detention time= (not calculated: outflow precedes inflow)
<br />Center-of-Mass det. time= 200.6 min ( 990.4 - 789.7 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 950.00'38,556 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 />950.00 5,166 0 0
<br />951.00 6,140 5,653 5,653
<br />952.00 7,165 6,653 12,306
<br />954.00 9,390 16,555 28,861
<br />955.00 10,000 9,695 38,556
<br />Device Routing Invert Outlet Devices
<br />#1 Discarded 950.00'0.250 in/hr Exfiltration over Surface area
<br />#2 Primary 947.50'18.0" Round Culvert L= 50.0' Ke= 0.500
<br />Inlet / Outlet Invert= 947.50' / 947.00' S= 0.0100 '/' Cc= 0.900
<br />n= 0.013, Flow Area= 1.77 sf
<br />#3 Device 2 951.00'8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
<br />#4 Device 2 952.00'4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
<br />Discarded OutFlow Max=0.05 cfs @ 12.41 hrs HW=953.58' (Free Discharge)
<br />1=Exfiltration (Exfiltration Controls 0.05 cfs)
<br />Primary OutFlow Max=19.64 cfs @ 12.41 hrs HW=953.58' TW=0.00' (Dynamic Tailwater)
<br />2=Culvert (Inlet Controls 19.64 cfs @ 11.11 fps)
<br />3=Orifice/Grate (Passes < 2.52 cfs potential flow)
<br />4=Sharp-Crested Rectangular Weir (Passes < 23.88 cfs potential flow)
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