Laserfiche WebLink
MSE 24-hr 3 2-Year Rainfall=2.81"Proposed Conditions - Filtration <br /> Printed 12/27/2019Prepared by Larson Engineering <br />Page 6HydroCAD® 10.00-21 s/n 01934 © 2018 HydroCAD Software Solutions LLC <br />Area (sf) CN Description <br />* 1,086 98 Impervious <br />* 27,772 98 New Impervious <br />95,438 80 >75% Grass cover, Good, HSG D <br />124,296 84 Weighted Average <br />95,438 76.78% Pervious Area <br />28,858 23.22% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />41.6 300 0.0150 0.12 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.75" <br />0.3 33 0.0150 1.84 Shallow Concentrated Flow, <br />Grassed Waterway Kv= 15.0 fps <br />41.9 333 Total <br />Summary for Subcatchment I: <br />Runoff = 2.79 cfs @ 12.13 hrs, Volume= 5,900 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 />* 20,594 98 New Impervious <br />15,947 80 >75% Grass cover, Good, HSG D <br />36,541 90 Weighted Average <br />15,947 43.64% Pervious Area <br />20,594 56.36% Impervious Area <br />Tc Length Slope Velocity Capacity Description <br />(min) (feet) (ft/ft) (ft/sec) (cfs) <br />5.3 61 0.1065 0.19 Sheet Flow, <br />Grass: Dense n= 0.240 P2= 2.75" <br />Summary for Subcatchment J: <br />Runoff = 4.66 cfs @ 12.17 hrs, Volume= 11,603 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 />* 38,321 98 New Impervious <br />36,423 80 >75% Grass cover, Good, HSG D <br />74,744 89 Weighted Average <br />36,423 48.73% Pervious Area <br />38,321 51.27% Impervious Area