For nearly 30 years, Agriculture Victoria has been supplying Sunraysia irrigators with weekly information on evapotranspiration (Eto).

Now, according to its irrigation extension officer Maxine Schache, things are about to be turned on their head.

Maxine says evapotranspiration is an estimate of the loss of water from both plants and the soil.

She says the main drivers of evapotranspiration are ...