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Salinity and yield of groundwater in the South West

Salinity and yield of groundwater in the South West

Where salinity is low and yield is high groundwater use is well established. The most reliable areas of good quality, high yielding groundwater in the region are found within the South West Limestone Groundwater Management Unit. 

How much fresh water is stored in aquifers across the region?

Fresh water = salinity less than 1,000 mg/L

It is estimated that a total of 153,500 GL of fresh water is stored in aquifers across the region: 6,000 GL in the upper aquifers, 22,500 GL in the middle aquifers and 125,000 GL in the lower aquifers. Estimates of fresh water stored in the basement are not available.

What is the salinity and yield like in local areas?

Salinity and yield vary greatly across the region depending on which aquifer group you are using and where your property is located. To get an accurate indication of the salinity and yield you can expect on your property you need to drill a bore and have the water tested. 

To view this information on a map visit the South West region map or you can download or print a summary of the likely salinity and yield of groundwater near your property on the Department of Environment, Land, Water and Planning website.

Salinity and yield by local area

Aquifer group Local area Salinity Yield
Upper Bungaree GMU Very good Good
  Cardigan GMU Moderate Moderate
  Colongulac GMU Moderate Moderate
  Glenormiston GMU Moderate Moderate
  Warrion GMU Good Moderate
  Far West area (non-GMU) Moderate Poor
  Central area (non-GMU) Poor Poor
  Eastern area (non-GMU) Poor Poor
Middle Condah GMU Moderate Very good
  Glenelg GMU Moderate Good
  South West Limestone GMU Good Good
Lower Gellibrand GMU Good Very good
  Gerangamete GMU Good Very good
  Jan Juc GMU Moderate Good
  Newlingrook GMU Very good Good
  Paaratte GMU Good Good
  Portland GMU Good Very good
  Warrnambool area (non-GMU) Moderate Moderate
  North central area (non-GMU) Moderate Poor
  West of Geelong (non-GMU) Poor Moderate

This table shows the likely salinity and yield in different local areas and aquifer groups across the region.

Learn the basics

For background information on salinity visit our What is groundwater salinity page.

For background information on yield visit our What is groundwater yield page.

Page last updated28th April 2015
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