Amid the threat of another California drought, federal regulators have ordered that a large reservoir south of San Jose be drained because of concerns that its dam may collapse in an earthquake.
Amid the threat of another California drought, federal regulators have ordered that a large reservoir south of San Jose be drained because of concerns that its dam may collapse in an earthquake, leading to a massive release of water that could flood much of Silicon Valley.Because the 240-foot-high earthen Anderson Dam could fail if a major earthquake strikes on the Calaveras Fault that sits next to it, the process of emptying the reservoir should begin no later than Oct.
Since 2009, the dam’s water level has been kept at a maximum of 74% of capacity because of an assessment that it could be damaged in a magnitude 6.6 earthquake centered at the fault or a 7.2 quake with an epicenter as far as a mile away. On Monday, as the possibility of another drought loomed in California, Anderson Reservoir was just 29% full.
She also noted the adverse impact draining the reservoir could have on residents, wildlife and the dam’s infrastructure.
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