This International Standard 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 to systems that make use
of the "Doppler shift" or "correlation" or "level-to-flow" techniques.
This International Standard is not applicable to measurement in rivers with ice.