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~ • DEWATERING PIPE <br />DISCHARGE UNDER FALLING HEAD <br />Assume surface area of ponds is constatx only height varies. <br />POND B POND C <br />AREA OF POND 26000 23000 SQUARE FEET <br />DIAMETER OF PIPE G.0 6.0 INCFIES <br />AREA OF PIPE = a 0.20 0.20 SQUARE FEET <br />C =LOSS COEFFICIENT 0.65 O.GS <br />H 1 =BEGINNING HEAD 8.00 8.000 FEET <br />H2 = END[NG HEAD 0.00 0.000 <br />1=lime to lower the surface level of the pond (HI-H2). <br />t = 2A*(H 1 ^.5 - H2^.5)/C*a*(2G)^.5 <br />l = 143675 127097 SECONDS <br />l= L6G 1.47 DAYS <br />Average Oow in pipe: 366 324 GPM <br />• <br />Reference Civil Engineering Handbook, <br />Urquhart, Fourth Edition, Page 4-34. <br />CHECK FRICTION LOSS IN PIPES <br />FRICTION LOSSES 1N PIPES <br />C =surface roughness constant -PVC 150.0 <br />q = (low in gpm 360.0 <br />d =inside diameter of pipe, inches G.0 <br />f=0.2083((100lC)^ 1. RS)(q^ 1.85)/(d^4.8655) <br />C=0.2083*((100/FG)^1.85)*(F7^1.8~)7(F8^J.8655) (1.863 /100 f( <br />Slope Pipes 2 "/o to compensate for Dead loss. <br />• <br />Trz - o ) <br />TR-OI EXH-8 -13 - 9rn <br />