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Hydrometry. Measurement of liquid flow in open channels using current-meters or floats Ingestion-build-266356 BS EN 4056-004 shall be1 Scope This International Standard specifies methods for determining the velocity and cross sectional area of water flowing in open channels without ice cover, and for computing the discharge therefrom. It covers methods of employing current meters or floats to measure the velocities. It should be noted that although, in some cases, these measurements are intended to determine the stage discharge relation of a gauging station, this International