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MSE 24-hr 3 2-Year Rainfall=2.81"Proposed Conditions - Filtration <br /> Printed 12/27/2019Prepared by Larson Engineering <br />Page 4HydroCAD® 10.00-21 s/n 01934 © 2018 HydroCAD Software Solutions LLC <br />Summary for Subcatchment C: <br />Runoff = 1.32 cfs @ 12.11 hrs, Volume= 2,504 cf, Depth= 1.71" <br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-90.00 hrs, dt= 0.01 hrs <br />MSE 24-hr 3 2-Year Rainfall=2.81" <br />Area (sf)CN Description <br />10,445 80 >75% Grass cover, Good, HSG D <br />* 7,156 98 New Impervious <br />17,601 87 Weighted Average <br />10,445 59.34% Pervious Area <br />7,156 40.66% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />3.0 Direct Entry, <br />Summary for Subcatchment D: <br />Runoff = 2.29 cfs @ 12.22 hrs, Volume= 6,729 cf, Depth= 1.86" <br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-90.00 hrs, dt= 0.01 hrs <br />MSE 24-hr 3 2-Year Rainfall=2.81" <br />Area (sf)CN Description <br />* 22,256 98 New Impervious <br />21,050 80 >75% Grass cover, Good, HSG D <br />43,306 89 Weighted Average <br />21,050 48.61% Pervious Area <br />22,256 51.39% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />11.3 57 0.0140 0.08 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.75" <br />2.7 138 0.0064 0.86 Sheet Flow, <br />Smooth surfaces n= 0.011 P2= 2.75" <br />14.0 195 Total <br />Summary for Subcatchment E: <br />Runoff = 1.34 cfs @ 12.25 hrs, Volume= 4,241 cf, Depth= 1.81" <br />Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-90.00 hrs, dt= 0.01 hrs <br />MSE 24-hr 3 2-Year Rainfall=2.81"