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Title
Guerrero and Cumberland Streets water cistern San Francisco 3 #276342863
Description
Not just random patterns,or inner-city versions of crop circles,these red brick circles are 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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