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MSE 24-hr 3 2-Year Rainfall=2.86"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 5HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Area (ac) CN Description
<br />*0.054 98
<br />2.869 70 Woods, Good, HSG C
<br />2.923 71 Weighted Average
<br />2.869 70 98.15% Pervious Area
<br />0.054 98 1.85% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />12.0 Direct Entry,
<br />Summary for Subcatchment P3: Proposed to Basin
<br />Runoff =1.40 cfs @ 12.16 hrs, Volume=0.074 af, Depth= 1.15"
<br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 2-Year Rainfall=2.86"
<br />Area (ac) CN Description
<br />*0.140 98
<br />0.638 74 >75% Grass cover, Good, HSG C
<br />0.778 78 Weighted Average
<br />0.638 74 82.01% Pervious Area
<br />0.140 98 17.99% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />8.0 Direct Entry,
<br />Summary for Subcatchment P3A: Proposed to Basin
<br />Runoff =0.64 cfs @ 12.16 hrs, Volume=0.034 af, Depth= 1.21"
<br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 2-Year Rainfall=2.86"
<br />Area (ac) CN Description
<br />*0.073 98
<br />0.263 74 >75% Grass cover, Good, HSG C
<br />0.336 79 Weighted Average
<br />0.263 74 78.27% Pervious Area
<br />0.073 98 21.73% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />8.0 Direct Entry,
<br />MSE 24-hr 3 2-Year Rainfall=2.86"24021_Idyllvale_PR
<br /> Printed 10/23/2024Prepared by Civil Methods, Inc.
<br />Page 6HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC
<br />Summary for Subcatchment P4: Direct from North
<br />Runoff =4.31 cfs @ 12.37 hrs, Volume=0.377 af, Depth= 0.90"
<br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 2-Year Rainfall=2.86"
<br />Area (ac) CN Description
<br />3.390 70 Woods, Good, HSG C
<br />*1.532 85 Wetland
<br />*0.090 98
<br />5.012 75 Weighted Average
<br />4.922 75 98.20% Pervious Area
<br />0.090 98 1.80% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />23.9 Direct Entry, Same as "Existing condition" calc
<br />Summary for Subcatchment P5: Offsite Direct
<br />Runoff =2.84 cfs @ 12.28 hrs, Volume=0.224 af, Depth= 0.91"
<br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 2-Year Rainfall=2.86"
<br />Area (ac) CN Description
<br />*0.401 98
<br />2.560 70 Woods, Good, HSG C
<br />2.961 74 Weighted Average
<br />2.560 70 86.46% Pervious Area
<br />0.401 98 13.54% Impervious Area
<br />Tc Length Slope Velocity Capacity Description
<br />(min) (feet)(ft/ft) (ft/sec)(cfs)
<br />11.9 100 0.1000 0.14 Sheet Flow,
<br />Woods: Light underbrush n= 0.400 P2= 2.86"
<br />5.2 500 0.1040 1.61 Shallow Concentrated Flow,
<br />Woodland Kv= 5.0 fps
<br />17.1 600 Total
<br />Summary for Subcatchment P6: Southwest corner
<br />Runoff =0.29 cfs @ 12.17 hrs, Volume=0.017 af, Depth= 0.72"
<br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
<br />MSE 24-hr 3 2-Year Rainfall=2.86"
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