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<br /> <br />Pond Dewatering Pipes <br />DEWATERING PIPE <br />DISCHARGE UNDER FALLING HEAD <br />Assume surface area of ponds is constant only height varies. <br />POND J <br />AREA OF POND 16600 SQUARE FEET <br />DIAMETER OF PIPE 6.0 INCHES <br />AREA OF PIPE = a 0.20 SQUARE FEET <br />C =LOSS COEFFICIENT 0.65 <br />H1 =BEGINNING HEAD 4.00 FEET <br />H2 =ENDING HEAD 0.00 <br />t =time to lower the surface level of the pond (H1-H2). <br />t = 2A'(H1 ^.5 - H2^.5yC'a'(2Gy~.5 <br />t= 64664 SECONDS <br />t = 0.75 DAYS <br />Average flow in pipe: <br />117 GPM <br />Reference Civil Engineering Handbook, <br />Urquhart, Fourth Edition, Page 4-34. <br />CHECK FRICTION LOSS IN PIPES <br />FRICTION LOSSES IN PIPES <br />li <br />C =surface roughness constant -PVC <br />q =flow in gpm <br />d =inside diameter of pipe, inches <br />f=0.2083((100/Cy`1.85)(q^ 1.85)/(d^4.8655) <br />f=0.2083'((100/F6)^1.85)'(F7^1.85)/(FS^4.8655) <br />Slope Pipes 2 % to compensate for head loss. <br />PR-07 <br />150.0 <br />117.0 <br />6.0 <br />0.108 /100ft <br />Exh-8 - 167 - <br />2/03 <br />