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Title
Folsum and 19th Sts. cistern, 1. #117544633
Description
Not just random patterns, or inner-city versions of crop circles, these red brick circles are in fact the exact locations of San Francisco`s underground cisterns. Known properly as Auxiliary Water Supply System, there are about 175 of these AWSS scattered around the city. To be used in case of another, major, city-wide fire and all the water systems are down, each one of these tanks can hold about 172,000 gallons of water.
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