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In this paper the author deals with the art of flow determination by current meter, compares the accuracy of this method with that of other means of water measurement, and draws attention to a number of precautions which should be observed in order to minimize error. He compares also the characteristics of cup and screw meters, discusses meter ratings, the effects of turbulence and angularity of flow, describes the channel sections best suited to accurate gaging, and covers in some detail the technique of flow determination under varying conditions in the field.

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