The common method of measuring flow through an open channel flow meter is to measure the height or HEAD of the liquid as it passes over an obstruction (a flume or weir) in the channel.
Application :
● Sewage pipes
● Wastewater treatment plant
● City sewer flow
● Farmland irrigation channels
Advantages
01
Easy to construct
02
Simple to determine flow with proper equations
03
Parshall flumes produce one-fourth the head loss of a weir designed to handle the same flow range
04
Parshall flumes are accurate in a wide range of conditions