watershedplus: Throughout San Francisco, 175 underground cisterns still exist as part of a dedicated fire emergency system developed in 1908. Most of them can be identified by a distinctive brick circle on the road. Following the 1906 earthquake, the

watershedplus: Throughout San Francisco, 175 underground cisterns still exist as part of a dedicated fire emergency system developed in 1908. Most of them can be identified by a distinctive brick circle on the road. Following the 1906 earthquake, the

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