The Department of Water sets an extraction limit on the groundwater aquifers within the Perth region. This limit is established to protect groundwater dependent ecosystems. Only water above this prescribed minimum water table level is considered a water asset in the water account. The volume of water that is beyond this extraction limit is considered a contingent water asset for aquifers in the Perth region. However, there is currently not enough information available regarding groundwater resources in the region to allow for a volumetric estimate.
Water for urban use (265,000 ML): Water Corporation manages the bore fields and reservoirs used for public water supply. Water Corporation also maintains water within the distribution system for delivery to the Perth metropolitan area and other urban centres within the Perth region. However, the actual delivery of the water is determined by the customers when they use the water. It is estimated that 265,000 ML will need to be delivered in the next reporting period (165,000 ML from groundwater stores and 100,000 ML from surface water stores).
Water for irrigation use (50,000 ML): Harvey Water, a private irrigator’s cooperative in the Perth region, is required to supply water to its members for irrigation. It is estimated that 50,000 ML will need to be delivered in the next reporting period. The amount of water delivered is subject to the irrigators of the Harvey Water Irrigation Cooperative drawing water from the system.
National Water Account 2010
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