Hydrometry. Liquid flow measurement using end depth method in channels with a free overfall1 Scope This document specifies a method for the estimation of the sub critical flow of clear water in a smooth, essentially horizontal channel (or a gently sloping channel), abruptly discontinued at bottom by a hydraulic structure, with a vertical drop and discharging freely. Such an overfall forms a control section and offers a means for the estimation of flow using the end depth measurement method. A wide variety of channel cross sections with

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