Water availability

Water availability
Water availability

Water availability

The Department of Water and Environmental Regulation licences the taking of water from about 250 groundwater and surface water resources in the South West region that are proclaimed under the Rights in Water and Irrigation Act 1914. The total volume of water available under allocation limits for these water resources is about 685 gigalitres per year, 60% of which is surface water and 40% groundwater. A high proportion of resources are fully allocated particularly in areas with the biggest population growth and economic development pressures.

Projected decline in rainfall

Projected decline in rainfall
Projected decline in rainfall

Projected decline in rainfall

Changes in average annual and seasonal rainfall can result in conditions that make a specific location unsuitable for that plant to grow or animal to thrive, i.e. the new rainfall range is outside of that species’ optimal range. The projected changes in rainfall for the South West are severe enough to result in large parts of the current ranges of many species becoming unsuitable for those species.

How we use water

How we use water
How we use water

How we use water

About 63% of the South West region’s total water use is by the agriculture sector. 14% is used in urban areas for households, commercial and parks and gardens; while heavy industry and mining make up 12% and 11% of the region’s total water use respectively.