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• DEWATERING PIPE <br /> <br /> DISCHARGE UNDER FALLING HEAD <br /> ASSUME SURF ACE AREA OF PONDS IS CONSTANT ONLY HEI GHT VARIES. <br /> POND I <br /> AREA OF POND 7238 SQUARE FEET <br /> DIAMETER OF PIPE 6.0 INCHES <br /> 4REA OF PIPE = A 0.20 SQUARE FEET <br /> C =LOSS COEFFICIENT 0.65 <br /> HI =BEGINNING HEAD 3.50 FEET <br /> H2 =ENDING HEAD 0.00 <br />T =TIME TO LOWER THE SURFACE LEVEL OF THE POND (HI-H2). <br />i = 2A•(H".5 - H2".5)/C•A•(2G)'.5 <br />T = 26456 SECONDS <br />T = 0.31 DAYS <br />AVERAGE FLOW IN PIPE: 45 GPM <br />• REFERENCE CIVIL ENGINEERING HANDBOOK, <br />UROUHART, FOURTH EDITION, PAGE 4-34. <br />CHECK FRICTION LOSS IN PIPES <br />FRICTION LOSSES IN PIPES <br />C =SURFACE TOUGHNESS CONSTANT -PVC 150.0 <br />0 =FLOW IN GPM 44.6 <br />D =INSIDE DIAMETER OF PIPE, INCHES 6.0 <br />F=0.2083((100/C)"1,85)(D"1.85)/(D'4.8655) <br />F=0.2083•((00/F6)"I.85)'(F7'.85)/(F8"4.8655) 0.018 /100 FT <br />SLOPE PIPES 2 % TO COMPENSATE FOR HEAD LOSS. <br />lI ,, <br />u <br />78-37 <br />Vol SA -Tab Pond Volumes W - 5 - / a~ 3/a) 9101 <br />