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S:\plowe\cad\23proj\2129 Jerry Carlson Little Canada\2129 MISC\Round 1 - 12.28.23\ MSE 24-hr 3 10-Year Rainfall=4.19"2129 Sunrise Over Gervais - Existing (12-28-2023) Printed 12/28/2023Prepared by Plowe Engineering, Inc. Page 9HydroCAD® 10.00-26 s/n 01574 © 2020 HydroCAD Software Solutions LLC Area (sf) CN Description * 12,105 98 IMPERVIOUS * 29,743 61 PERVIOUS 41,848 Weighted Average 29,743 71.07% Pervious Area 12,105 28.93% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.6 100 0.0630 0.25 Sheet Flow, Grass: Short n= 0.150 P2= 2.83" 0.8 198 0.0440 4.26 Shallow Concentrated Flow, SHALLOW Paved Kv= 20.3 fps 7.4 298 Total Summary for Reach R1: WEST Inflow Area = 0.809 ac, 0.00% Impervious, Inflow Depth = 0.91" for 10-Year event Inflow = 1.20 cfs @ 12.15 hrs, Volume= 0.061 af Outflow = 1.20 cfs @ 12.15 hrs, Volume= 0.061 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs Summary for Reach R2: NORTH Inflow Area = 1.991 ac, 15.57% Impervious, Inflow Depth = 1.38" for 10-Year event Inflow = 3.54 cfs @ 12.19 hrs, Volume= 0.229 af Outflow = 3.54 cfs @ 12.19 hrs, Volume= 0.229 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs Summary for Pond D1: EXISTING DITCH Inflow Area = 1.991 ac, 15.57% Impervious, Inflow Depth = 1.38" for 10-Year event Inflow = 3.84 cfs @ 12.16 hrs, Volume= 0.230 af Outflow = 3.55 cfs @ 12.19 hrs, Volume= 0.230 af, Atten= 8%, Lag= 1.9 min Discarded = 0.01 cfs @ 12.19 hrs, Volume= 0.000 af Primary = 3.54 cfs @ 12.19 hrs, Volume= 0.229 af Routing by Dyn-Stor-Ind method, Time Span= 0.00-100.00 hrs, dt= 0.01 hrs Peak Elev= 887.40' @ 12.19 hrs Surf.Area= 899 sf Storage= 182 cf Flood Elev= 890.00' Surf.Area= 8,744 sf Storage= 12,708 cf Plug-Flow detention time= 0.2 min calculated for 0.230 af (100% of inflow) Center-of-Mass det. time= 0.2 min ( 805.3 - 805.1 )