Water Use Efficiency WUE) means maximising the returns from and minimising the environmental impacts of every megalitre (ML) of water used for irrigation purposes. Improved WUE therefore can result in a range of outcomes including reducing overall water usage, growing more hectares, producing higher yields and/or better quality produce and reducing any negative impacts that may be occurring through excessive drainage, poor water quality etc. Failing to measure and manage WUE at the farm and field level can compromise the economic and environmental sustainability of irrigated fanning.