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 awss brick can case circles cistern cisterns city citywide crop down each exact fact fire folsum franciscos gallons hold innercity just locations major nknown not one patterns properly random red san scattered sts supply system systems tanks there underground used versions water watern

Folsum And 19th Sts. Cistern, 2. Editorial Image


Folsum and 19th Sts. cistern, 2. Editorial Stock Photo
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Folsum and 19th Sts. cistern, 2. #117544722
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.

This image is editorial