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. Pond Dewatering <br />AS-BUILT WATER VOLUME <br />VOLUME <br />PUMP CAPACITY <br />PUMP SIZE <br />Dewatering Time <br />POND J DEWATERING <br />USE A PUMP WITH A CAPACITYTO DEWATER IN 48-HOURS <br />PONDJ <br />~S4- Acre-Feet <br />861108 Gallons <br />299 GPM <br />4" <br />2880.00 Minutes <br />48.00 Hours <br />2.00 Days <br />POND K DEWATERING <br />DEWATERING PIPE <br />DISCHARGE UNDER FALLING HEAD <br />Assume surface area of ponds is constant only height varies. <br />POND K <br />AREA OF POND ~ SQUARE FEET <br />• <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 2.00 FEET <br />H2 =ENDING HEAD 0.00 <br />t = time to lower the surface level of the pond (H1-H2). <br />t = 2A'(H1^.6 - H2".SpC'a'(2G)^.5 <br />t = 31951 SECONDS <br />t = 0.37 DAYS <br />Average flow in pipe: 47 GPM <br />Reference Civil Engineering Handbook, <br />Urquhart, Fourth Edition, Page 4-34. <br />I 1 <br />~J <br />TR-045 Exh-8 - 169 - 12/06 <br />APPko~D <br />~/3~07 <br />