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<br />• DEWATERING PIPE <br />DISCHARGE UNDER FALLING HEAD <br />Assume surface area of ponds is constant only height varies. <br />POND F <br />AREA OF POND 25064 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 />Hi =BEGINNING HEAD 8.00 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^.5)/C`a`(2G)^.5 <br />t= 138503 Seconds <br />t = 1.60 Days <br />• Average flow in pipe: 353 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 />C =surface roughness constant -PVC 150.0 <br />q =flow in gpm 353 <br />d =inside diameter of pipe, inches 6.0 <br />f=0.2083 ((100/C)^1.85) (q^1.85)/(d^4.8655) <br />f=0.2083'((100/F6)^1.85)'(F7^1.85)/(F8^4.8655) 0.832 /100 ft <br />Slope Pipes 2 % to compensate for head loss. <br />• <br />APP-B - ~ - <br />11/03 <br />