South West region
Surface water is very important in the South West, and provides more than half of the water used in the region. The region also contains significant fresh groundwater resources stored in a thick succession of sedimentary aquifers in southern Perth Basin and the Collie Basin. Where groundwater is shallow or meets the surface it supports many high value, groundwater-dependent environmental features, which are also highly socially and culturally valued.
The Wellington Reservoir on the Collie River is the largest water storage in the South West. Water from the smaller catchments is used for self-supply irrigation, particularly for horticulture and viticulture. Rivers generally flow all year round responding to winter rainfall and are supported by groundwater in the summer; however, the drying climate trend is changing this.
Allocation planning in the South West is taking account of this change to ensure that that surface water and groundwater resources are used sustainably – supporting population growth, economic development and the water-dependent environment.
Water allocation plans
For more information on the water allocation plans in this region, click on the plan image below. Alternatively, click directly to the plan document under related publications on the right.
|Kemerton subareas groundwater management plan||Lower Collie surface water allocation plan||Upper Collie water allocation plan|
|South West groundwater areas allocation plan||Whicher area surface water allocation plan||Warren-Donnelly surface water allocation plan|
Wellington Reservoir, on the Collie River, overflowing in September 2007.
A self-supply dam in the Chapman Brook catchment in the South West. Photo taken by Ash Ramsay in 2009.