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MSE 24-hr 3 10-Year Rainfall=4.26"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 15HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Primary OutFlow Max=6.24 cfs @ 12.26 hrs HW=961.45' TW=0.00' (Dynamic Tailwater)
<br />1=Culvert (Passes 6.24 cfs of 13.99 cfs potential flow)
<br />2=Orifice/Grate (Weir Controls 6.24 cfs @ 2.20 fps)
<br />Summary for Pond P1i: Infiltration Basin 1
<br />Inflow Area =5.329 ac, 26.82% Impervious, Inflow Depth = 2.18" for 10-Year event
<br />Inflow =12.80 cfs @ 12.27 hrs, Volume=0.969 af
<br />Outflow =7.17 cfs @ 12.48 hrs, Volume=0.969 af, Atten= 44%, Lag= 12.6 min
<br />Discarded =0.05 cfs @ 12.48 hrs, Volume=0.204 af
<br />Primary =7.13 cfs @ 12.48 hrs, Volume=0.765 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 952.56' @ 12.48 hrs Surf.Area= 7,783 sf Storage= 16,459 cf
<br />Plug-Flow detention time= 384.8 min calculated for 0.969 af (100% of inflow)
<br />Center-of-Mass det. time= 385.1 min ( 1,182.2 - 797.2 )
<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 @ 12.48 hrs HW=952.56' (Free Discharge)
<br />1=Exfiltration (Exfiltration Controls 0.05 cfs)
<br />Primary OutFlow Max=7.13 cfs @ 12.48 hrs HW=952.56' TW=0.00' (Dynamic Tailwater)
<br />2=Culvert (Passes 7.13 cfs of 17.66 cfs potential flow)
<br />3=Orifice/Grate (Orifice Controls 1.86 cfs @ 5.32 fps)
<br />4=Sharp-Crested Rectangular Weir (Weir Controls 5.27 cfs @ 2.44 fps)
<br />MSE 24-hr 3 10-Year Rainfall=4.26"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 16HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Summary for Pond P2i: Infiltration Basin 2
<br />Inflow Area =0.488 ac, 37.70% Impervious, Inflow Depth = 2.63" for 10-Year event
<br />Inflow =2.00 cfs @ 12.15 hrs, Volume=0.107 af
<br />Outflow =1.80 cfs @ 12.19 hrs, Volume=0.107 af, Atten= 10%, Lag= 2.1 min
<br />Discarded =0.01 cfs @ 12.19 hrs, Volume=0.031 af
<br />Primary =1.79 cfs @ 12.19 hrs, Volume=0.076 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 945.31' @ 12.19 hrs Surf.Area= 1,224 sf Storage= 1,291 cf
<br />Plug-Flow detention time= (not calculated: outflow precedes inflow)
<br />Center-of-Mass det. time= 428.3 min ( 1,206.8 - 778.5 )
<br />Volume Invert Avail.Storage Storage Description
<br />#1 944.00'3,707 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 />944.00 744 0 0
<br />946.00 1,475 2,219 2,219
<br />947.00 1,500 1,488 3,707
<br />Device Routing Invert Outlet Devices
<br />#1 Discarded 944.00'0.250 in/hr Exfiltration over Surface area
<br />#2 Primary 942.00'8.0" Round Culvert L= 20.0' Ke= 0.500
<br />Inlet / Outlet Invert= 942.00' / 941.80' S= 0.0100 '/' Cc= 0.900
<br />n= 0.013, Flow Area= 0.35 sf
<br />#3 Device 2 945.00'12.0" Horiz. Orifice/Grate C= 0.600 Limited to weir flow at low heads
<br />Discarded OutFlow Max=0.01 cfs @ 12.19 hrs HW=945.31' (Free Discharge)
<br />1=Exfiltration (Exfiltration Controls 0.01 cfs)
<br />Primary OutFlow Max=1.79 cfs @ 12.19 hrs HW=945.31' TW=0.00' (Dynamic Tailwater)
<br />2=Culvert (Passes 1.79 cfs of 2.90 cfs potential flow)
<br />3=Orifice/Grate (Weir Controls 1.79 cfs @ 1.83 fps)
<br />Summary for Pond P3i: Infiltration Basin 3
<br />Inflow Area =1.114 ac, 19.12% Impervious, Inflow Depth = 2.22" for 10-Year event
<br />Inflow =3.98 cfs @ 12.15 hrs, Volume=0.206 af
<br />Outflow =2.75 cfs @ 12.23 hrs, Volume=0.206 af, Atten= 31%, Lag= 4.3 min
<br />Discarded =0.01 cfs @ 12.23 hrs, Volume=0.051 af
<br />Primary =2.74 cfs @ 12.23 hrs, Volume=0.155 af
<br />Secondary =0.00 cfs @ 0.00 hrs, Volume=0.000 af
<br />Routing by Dyn-Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />Peak Elev= 953.52' @ 12.23 hrs Surf.Area= 2,094 sf Storage= 2,532 cf
<br />Plug-Flow detention time= 367.0 min calculated for 0.206 af (100% of inflow)
<br />Center-of-Mass det. time= 367.3 min ( 1,161.6 - 794.3 )
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