Issue 15 and Volume 43.

THE MEASUREMENT OF FLOWING WATER Ernest W. Schoder, professor of Experimental Hydraulics at Cornell University, has contributed to the Cornell Civil Engineer some interesting notes on the “Measurement of flowing water”—something which has become a necessity in modern engineering. Its methods must be suited to the occasion, which may be “scientific investigation, special commercial tests, or continuous record in connection with the operation of a plant or system, or in case of the flow of a stream.” The sharp-crest weir is one form of measurement. It is a very common measuring device, and, with careful observation of the head, the discharge over the crest of a well-constructed weir of that type will be accurate from t to 3 per cent. The conditions may not be such as to require the formula involving the velocity of approach. The ideal weir is one with no such velocity; but, where that cannot be…

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