Finished drinking water from in the JWC Water Treatment Plant is pumped about one-half mile up to the Fern Hill Reservoirs, two 20-million-gallon, above-ground storage reservoirs situated at 520 feet elevation. To transport water from the water treatment plant to Beaverton, the City owns 14 million gallons per day (mgd) capacity in the JWC South Transmission Line.
The City also owns emergency backup capacity in the parallel JWC North Transmission Line. From the two Fern Hill Reservoirs, water travels about 20 miles by gravity through large-diameter transmission lines to Beaverton, where the City’s two terminal water storage reservoirs are located in central Beaverton. The City’s two terminal water storage reservoirs hold a combined total of 20 million gallons.
Aquifer Storage & Recovery (ASR)
Since 1999, the City has used aquifer storage and recovery (ASR) to temporarily limit the purchase of new water supply facilities. During the winter and spring, Beaverton injects treated drinking water from the JWC Water Treatment Plant into natural underground basalt formations (aquifers), displacing native groundwater. During the summer months, treated water is recovered from ASR wells to supplement JWC surface water to help meet peak season demands (up to 17 mgd).
Acting as a conservation measure, ASR conserves surface water from primary sources (rivers and dams) during environmentally stressful summer seasons. Beaverton has reduced its diversion of limited summer river streamflow and water stored behind dams by substituting stored water recovered from ASR wells.