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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 8HydroCAD® 10.00-21 s/n 01934 © 2018 HydroCAD Software Solutions LLC <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />8.9 55 0.0236 0.10 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.75" <br />1.3 70 0.0100 0.90 Sheet Flow, <br />Smooth surfaces n= 0.011 P2= 2.75" <br />10.2 125 Total <br />Summary for Subcatchment M: <br />Runoff = 2.03 cfs @ 12.17 hrs, Volume= 5,202 cf, Depth= 1.94" <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 />* 18,130 98 New Impervious <br />14,121 80 >75% Grass cover, Good, HSG D <br />32,251 90 Weighted Average <br />14,121 43.78% Pervious Area <br />18,130 56.22% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />8.1 45 0.0200 0.09 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.75" <br />1.9 193 0.0283 1.67 Sheet Flow, <br />Smooth surfaces n= 0.011 P2= 2.75" <br />10.0 238 Total <br />Summary for Subcatchment N: <br />Runoff = 19.78 cfs @ 12.15 hrs, Volume= 41,394 cf, Depth= 1.16" <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 />* 15,991 98 New Impervious <br />410,573 80 >75% Grass cover, Good, HSG D <br />426,564 81 Weighted Average <br />410,573 96.25% Pervious Area <br />15,991 3.75% Impervious Area