Water is one of the key resources for industry and economic development in Australia. It is one of the main inputs to maximise the production of the cotton plant. Due to the rising pressures on the use and allocation of the national water resource (and in particular the Murray Darling Basin) "water use efficiency" has gained an ever increasing profile. The term typically means different things to different people. If one thing were common however it would be to maximise the opportunities for benefit from the water through optimal management of that water.