10.9 Managed aquifer recharge – urban water system
This line item volume (1,212 ML) represents the total volume of treated wastewater transferred to groundwater via an injection well from the Beenyup Wastewater Treatment Plant during the 2011–12 year.
Treated wastewater from the Beenyup treatment plant is transferred to the groundwater store as part of the groundwater replenishment trial that commenced in November 2010. More information on the groundwater replenishment trial is provided on the Water Corporation website.
Treated wastewater from the Beenyup Wastewater Treatment Plant was transferred to the Advanced Water Recycling Plant where it underwent further treatment. The treated wastewater was then transferred into the groundwater store via an injection well. The volume of aquifer recharge is based on metered data at the recycling plant that is collected on an almost continuous basis.
Assumptions, limitations, caveats and approximations
Expected error for water meters is +/– 5%.
The Department of Water requires that all water meters, when tested under in situ conditions, must be within 5% accuracy across the full flow rate range (Guidelines for water meter installation 2009).