The wheel consists of a drum on an axle, with eight v-shaped vanes fixed to the outside. It sits laterally across a channel and is turned by water flow. The revolving wheel measures flow from the irrigation supply channels into the farm channels, providing the basis upon which irrigation farmers are charged for water. Wheels generally last for 15 to 20 years, and the axle is replaced every 5 years.
Green, KD (online 2000) . Irrigation Development. "Measuring farm supplies — the Dethridge wheel". Technology in Australia (Parkville, Victoria, AU: Australian Academy of Technological Sciences and Engineering). pp. page 157. ISBN 0-908029-49-7. Retrieved 2007-02-21.Check date values in: |date= (help)