source: www.macemeters.com IntroductIon: Many large open channels have been historically monitored using a flume or weir structure that has been “rated” using empirical data. Typically this rating is based on the depth of the water running over/through the structure. In recent times, the use of flumes and weirs has been negated somewhat by the advent of cheaper area/velocity methods, such as the MACE Doppler ultrasonic. However,

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