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P = erosion control practice factor 1.00 <br />A = sediment, tons/acre/year 3.44 <br />TWO YEAR SEDIMENT VOLUME - CUBIC FEET 0.19 <br />70.93 ACRES - 115 #/CF <br />TOTAL REQUIRED CAPACITY — Acre Feet - Office Pond 1.89 <br />Peak Flow Calculations <br />The following peak flow calculations were compiled with SEDCAD. <br />Details of the run-off calculations are shown on the following pages. <br />25 -YR <br />24 HR <br />Event <br />McGob Pond Drainage 38.1 <br />Flow calculations for the site ditches and culverts are <br />presented in following sections of this exhibit. <br />iEmergency Spillway Design across top of embankment <br />�1 Manning's Equation <br />Flow In a Trapezoidal Channel <br />DEPTH D <br />0.93 <br />FEET <br />WIDTH W <br />8 <br />FEET <br />Slope S <br />0.02 <br />EXPRESS AS DECIMAL <br />Mannings "N" N <br />0.04 <br />EXPRESS AS DECIMAL <br />SIDE SLOPE X <br />1.5 <br />SLOPE = X:1 <br />AREA=(W*D)+(X*D2)= <br />8.74 Feet2 <br />WETTED PERIMETER=(W)+2*[((X*D)2+D2)M) <br />11.35 Feet <br />R=AREANVETTED PERIMETER <br />0.77 <br />V=(1.49/N)*(R2r3)*(S "2)= <br />Q=AXV= <br />Q REQUIRED - Peak.Discharge <br />4.42 Ft/Sec <br />38.65 CFS <br />38.10 CFS <br />TR -16 15 05/08 <br />