After the Rim fire, a new worry: water
Steep Sierra Nevada slopes burned in California's third-largest wildfire are primed for flooding and debris flows in a big winter storm.
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Hetch Hetchy Reservoir
William Sears, a science and policy analyst with the Hetch Hetchy Regional Water System, walks along the Hetch Hetchy Reservoir. San Francisco officials are closely monitoring hydroelectric facilities, soil conditions and water quality in and around reservoir, where the Rim fire crept around the edges of the city's drinking water supply and made some areas more prone to erosion.