Index to Transactions, Volumes I to Lxxxiii (1867-1920)
Index to Transactions, Volumes I to Lxxxiii (1867-1920)
American Society of Civil Engineers. Transactions of the American Society of Civil Engineers. (Indexes)
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Digitized by VjOOQIC 238 mpted its flow and reduced it to a kiod of elongated basin, with an almost inappreciable slope. The relation of discharge to height of water surface resembles the law of discharge over a weir, and suggests their dependence upon the level of the dam or the bar below them. It will be observed that small as are the slopes, their effect is much less than would be indicated by Eutter's or any other slope formula, unless indeed the bed is very rough, which it is understood, w...as not the case. Mr. McMath has shown that these observations conform very nearly to his newly published law, that in certain (numerous) cases that velocity varies directly as the stage. The same results have been observed before in a similar case— that is, the Ch^zy co-efficient of velocity, has been found to diminish very rapidly and become very low, about the same as here, viz. : 62, when the stage approached lowest water. This upon a pool 10 miles long, 5 to 12 feet deep at low water, closed at its lower end by a bar, having a narrow, shallow channel.
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