You could think of it as a vast water bank account.
For the past eight years, the San Antonio Water System (SAWS) has used the Twin Oaks Aquifer Storage and Recovery (ASR) facility to ensure a reliable water supply to the city's 1.4 million residents, even in the face of drought.
The $250 million ASR system allows SAWS to store water deep underground during wet periods, then withdraw it during dry spells — such as the severe drought of 2011. The system, about 10 miles south of the city limits, includes a well field with 32
