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MSE 24-hr 3 2-Year Rainfall=2.86"24021_Idyllvale_EX <br /> Printed 10/23/2024Prepared by Civil Methods, Inc. <br />Page 5HydroCAD® 10.10-5a s/n 07283 © 2020 HydroCAD Software Solutions LLC <br />Summary for Subcatchment E3: Existing Southwest corner <br />Runoff =0.37 cfs @ 12.19 hrs, Volume=0.022 af, Depth= 0.64" <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 />0.410 70 Woods, Good, HSG C <br />*0.000 98 <br />0.410 70 Weighted Average <br />0.410 70 100.00% Pervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet)(ft/ft) (ft/sec)(cfs) <br />10.0 Direct Entry, <br />Summary for Reach 1R: Existing to offsite <br />Inflow Area =18.237 ac, 3.02% Impervious, Inflow Depth = 0.76" for 2-Year event <br />Inflow =12.64 cfs @ 12.37 hrs, Volume=1.154 af <br />Outflow =12.64 cfs @ 12.37 hrs, Volume=1.154 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 />MSE 24-hr 3 10-Year Rainfall=4.26"24021_Idyllvale_EX <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 E1: Existing South <br />Runoff =18.95 cfs @ 12.34 hrs, Volume=1.582 af, Depth= 1.62" <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 10-Year Rainfall=4.26" <br />Area (ac) CN Description <br />11.162 70 Woods, Good, HSG C <br />*0.541 98 <br />11.703 71 Weighted Average <br />11.162 70 95.38% Pervious Area <br />0.541 98 4.62% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet)(ft/ft) (ft/sec)(cfs) <br />17.2 100 0.0400 0.10 Sheet Flow, <br />Woods: Light underbrush n= 0.400 P2= 2.86" <br />5.7 550 0.1040 1.61 Shallow Concentrated Flow, <br />Woodland Kv= 5.0 fps <br />22.9 650 Total <br />Summary for Subcatchment E2: Existing Lot 4 <br />Runoff =11.06 cfs @ 12.35 hrs, Volume=0.915 af, Depth= 1.79" <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 10-Year Rainfall=4.26" <br />Area (ac) CN Description <br />4.582 70 Woods, Good, HSG C <br />*1.532 85 Wetland <br />*0.010 98 <br />6.124 74 Weighted Average <br />6.114 74 99.84% Pervious Area <br />0.010 98 0.16% 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 />2.1 230 0.1330 1.82 Shallow Concentrated Flow, <br />Woodland Kv= 5.0 fps <br />9.9 590 0.0200 0.99 Shallow Concentrated Flow, <br />Short Grass Pasture Kv= 7.0 fps <br />23.9 920 Total <br />155