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SPILLWAY POND I <br />• DETERMINE FLOW VELOCITY ACROSS 2% EMBANKMENT <br /> <br /> POND EMBANKMENT SPILLWAY <br /> MANNING'S EQUATION <br /> FLOW IN A TRAPEZOIDAL CHANNEL <br />DEPTH D 0.800 <br />WIDTH W 4.000 <br />SLOPE S 0.020 <br />MANNINGS "N" N 0.040 <br />SIDE SLOPE X 2.000 <br />AREA=(W'D)+(X •D"2)= <br />WETTED PERIMETER=(W)+2•[( (X •D)'2+D'2)"O.5] <br />R=AREA/WETTED PERIMETER <br />V=(1.49/N)•(R".667)' (S'.5)= <br />O =AXV= <br />O REQUIRED - PEAK DISCHARGE <br /> SEDIMENT POND I <br />• RIPRAP SIZING - ACROSS TOP OF EMBANKMENT - POND 1 <br /> <br /> D50 = SIZE OF RIPRAP <br /> D50 = ((V X S".17)/7.58))'2 <br /> D50 = DIAMETER IN FEET <br /> V = VELOCITY <br /> S = SLOPE <br /> D50 = 0.1 FEET <br />RUN-OFF VOLUME - - POND 2 <br />FEET <br />FEET <br />EXPRESS AS DECIMAL <br />EXPRESS AS DECIMAL <br />SLOPE = X:I <br />4,48 FEET"2 <br />7.58 FEET <br />0.59 <br />3.71 FT/SEC <br />16.62 CFS <br />15.75 CFS <br />I INCHES NONE REDUIRED <br /> PRECIP DIRECT <br />AREA ACRES CURVE # AMOUNT RUN-OFF <br />DlsruRBeD (R2) 6.16 87 1.7 0.68 <br />DAKBRUSH (01) 18.11 60 1.7 0.02 <br />DISTURBED (R4) I.78 87 I.7 0.68 <br />TOTAL 26.05 <br />TOTAL REQUIRED WATER VOLUME - - A-F <br />J <br />RUN-OFF <br />VOL A-F <br />0.35 <br />0.03 <br />0.10 <br />0.48 <br />0.48 <br />7R-37 <br />VOI 8A -Tab Pond Volumes W - 8 - /0/3/0 ) 9101 <br />