Why SF's water depends on a single, century old tunnel

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Why SF's water depends on a single, century old tunnel
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The MySFPUC is investing $238 million in rehabilitating the Mountain Tunnel. “We want to extend it another 100 years,” said Randy Anderson.

Without a single, unassuming tunnel tucked into a shrubby hillside near Groveland in Tuolumne County, San Francisco’s water supply would be cut off near the source.

That’s why the SFPUC is investing $238 million in rehabilitating the Mountain Tunnel. “We want to extend it another 100 years,” said Randy Anderson, a project manager overseeing the rehabilitation project at the SFPUC. “This is high-quality water. It is probably the best in the nation, but we want to get it better and not have any groundwater intrusion coming inside.”

The Mountain Tunnel project is one way the SFPUC is shoring up its system against the intensifying impacts of a warming world. California has always lurched between wet and dry periods, but climate change is supercharging these cycles of boom and bust, evidenced by this year’s soaking wet winter that followed the three driest years on record.

Five under $20: what to do in San Francisco next week How to keep busy this holiday weekend — and beyond Because storage is hard to come by in California, only a fraction of the water can be stored as insurance against future drought, said Miller. “Hetch Hetchy is full, so they have to displace four times,” she said. “We’ll probably drink a fifth of that. So four-fifths of that will go down the river – which is great for the fish.”

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