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In page Barton Springs:

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The main spring discharges an average flow of about 31 million US gallons (120,000 m3) per day. The lowest discharge ever recorded was 9 million US gallons (34,000 m3) per day during the drought of the 1950s, and the highest discharge ever recorded was 85 million US gallons (320,000 m3) per day during the December 1991 floods. By comparison, a typical domestic swimming pool holds about 50,000 US gallons (190 m3), and the City of Austin, a city of about 775,000 residents, uses about 220 million US gallons (830,000 m3) per day for its public water supply system.