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• DE WATERING PIPE <br />DISCHARGE UNDER FALLING HEAD <br />ASSUME SURFACE AREA OF PONDS IS CONSTANT ONLY HEIGHT VARIES. <br />POND 2 <br /> AREA OF POND 8929 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 4.10 FEET <br /> H2 =ENDING HEAD 0.00 <br /> T =TIME TO LOWER THE SURFACE LEVEL OF THE POND (H-H2). <br /> T = 2A'(HI".5 - H2".5)/C'A'(2G)'.5 <br /> i = 35323 SECONDS <br /> T = 0.41 DAYS <br /> AVERAGE FLOW IN PIPE: 64 GPM <br /> REFERENCE CIVIL ENGINEERING HANDBOOK, <br /> UROUHART, FOURTH EDITION, PAGE 4-34. <br />• CHECK FRICTION LOSS IN PIPES <br /> <br /> FRICTION LOSSES IN PIPES <br /> C =SURFACE ROUGHNESS CONSTANT -PVC 150.0 <br /> 0 =FLOW IN GPM 6L.5 <br /> D =INSIDE DIAMETER OF PIPE, INCHES 6.0 <br /> F=0.2083((100/C)' I.85)(a"I.85)/(D"4.8655 ) <br /> F=0.2083•((100/F6)'I.85)'(F7'I.BS)/(FB'4.8655) 0.036 /100 FT <br /> SLOPE PIPES 2 % TO COMPENSATE FOR HEAD LOSS. <br />• <br /> Tk-3~ <br /> VOI BA -Tab Pond Volumes W - 6 - gyp/ g/o ) <br />9101 <br />