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• WEST MINE NORRIS POND <br />For the purpose of this calculation it is presumed that the 25 yr. <br />24 hr. flow will not over top the road, therefore, the peak flow will <br />only result from the sediment area of the Norris Pond. <br />A = 5.28 acres <br />640 acres/sq.mi. _ .0083 <br />16.7 qp = 484 AQ <br />D + L qp = peak runoff <br />2 Q = rainfall in inches <br />= 484 (.0083)(.95) A = Area in sq. miles <br />6 + .057 d D = duration of rain <br />2 L = Lag time in hours <br />= 1.25 second feet <br /> <br />• <br />