Perth

Lateral inflows into each groundwater store within the two model regions during 2009-10 are given below.

The Leederville and Yarragadee aquifers are confined within the Peel-Harvey region. Therefore, there is no lateral flux between these groundwater stores within the region and groundwater stores outside the boundary.

Data source

Western Australian Department of Water: Perth Regional Aquifer Model (PRAMS) Version 3.4 and Peel-Harvey Regional Aquifer Model (PHRAMS) groundwater models.

Data provider

Western Australian Department of Water.

Method

This line item refers to the volume of lateral flux (both inflow and outflow) between the three primary groundwater stores (water table aquifers and the underlying aquifers - Leederville and Yarragadee) within the region and groundwater stores outside the region. The lateral flux was estimated for the Perth region (the area between Gingin and Mandurah) and the Peel-Harvey region (the area south of Mandurah) using the PRAMS and PHRAMS models, respectively. Both groundwater models derive the lateral flux by defining the appropriate water balance zones and calculating the volume of water flowing across each boundary on an annual basis.

Uncertainty

Ungraded.

Approximations, assumptions, caveats/limitations

Both models were initially developed to estimate and assess the impacts of changes in climatic conditions and varying extraction rates on the aquifers, not to prepare water accounts. These models have since been modified to also provide data for water accounting.