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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 3HydroCAD® 10.00-21 s/n 01934 © 2018 HydroCAD Software Solutions LLC <br />Summary for Subcatchment A: <br />Runoff = 5.21 cfs @ 12.36 hrs, Volume= 19,497 cf, Depth= 1.27" <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 />* 4,845 98 Impervious <br />162,884 80 >75% Grass cover, Good, HSG D <br />* 15,805 98 New Impervious <br />183,534 82 Weighted Average <br />162,884 88.75% Pervious Area <br />20,650 11.25% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />7.6 113 0.1504 0.25 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.75" <br />12.9 117 0.0427 0.15 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.75" <br />3.8 61 0.2500 0.27 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.75" <br />24.3 291 Total <br />Summary for Subcatchment B: <br />Runoff = 1.24 cfs @ 12.14 hrs, Volume= 2,803 cf, Depth= 1.83" <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 />* 9,000 98 New Impervious <br />9,393 80 >75% Grass cover, Good, HSG D <br />18,393 89 Weighted Average <br />9,393 51.07% Pervious Area <br />9,000 48.93% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />5.7 38 0.0340 0.11 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.75" <br />1.5 116 0.0200 1.31 Sheet Flow, <br />Smooth surfaces n= 0.011 P2= 2.75" <br />7.2 154 Total