Treated wastewater from the Kwinana Wastewater Treatment Plant is infiltrated to the groundwater store to assist in maintaining environmental values at The Spectacles wetlands on the Swan Coastal Plain. The groundwater in this region is also extracted and recycled by Alcoa.
During the 2009-10 reporting period, the volume of treated wastewater infiltrated to the groundwater aquifer (of 1,475 ML) was equivalent to approximately 1% of the total treated wastewater discharged from treatment plants within the region.
Water Corporation: Operational Data Storage System.
Treated wastewater from the Kwinana Wastewater Treatment Plant is infiltrated to the groundwater store. The volume of treated wastewater infiltrated to groundwater is based on metered data at the treatment plant, which is collected on an almost continuous basis.
Expected error for water meters is +/- 5-10%.
The Department of Water requires that all water meters, when tested in situ conditions, must be within 5% accuracy across the full flow rate range (Department of Water 2009).