Rural Alberta water district uses flowmeters to regulate distribution
The United Irrigation District (UID) in southern Alberta, Canada, serves 34,400 acres of rural land with a series of canals, channels and pipelines running 236 km throughout the region. Water is a valuable resource in the arid regions of the province, and agriculture uses 60 to 65% of the fresh water consumed, so water use is closely regulated and monitored.
Fred Rice, manager of the United Irrigation District, was looking for a flowmeter that did not obstruct flow in the irrigation canals. He used many meter types in the past, but “other methods required a structure or weir in the channel that raised the water level and required a holding pond.”
So the UID began installing AVFM area-velocity flowmeters in 2008. The Greyline flowmeters work with a sealed ultrasonic sensor mounted at the bottom of a pipe or channel. The submerged sensor measures water level plus velocity, and the flowmeter is calibrated according to the size of the pipe or channel.
The UID uses the area-velocity meter’s flow rate display to regulate daily total flow delivered to its customers. Water users notify the UID prior to operation. The district knows the typical water consumption of each pivot, so ditch riders adjust channel gates to regulate the flow rate and provide sufficient water for the number of pivots scheduled to be in operation. Unused water is returned to the river.