Hydrometry. Measurement of discharge by the ultrasonic transit time (time of flight) method1 Scope This document describes the establishment and operation of an ultrasonic (transit time) gauging station for the continuous measurement of discharge in a river, an open channel or a closed conduit. It also describes the basic principles on which the method is based, the operation and performance of associated instrumentation and procedures for commissioning. It is limited to the transit time of ultrasonic pulses technique, and is not applicable

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