The century-old battle over the Hetch Hetchy Reservoir moves to the San Francisco ballot next month with a measure that could determine the future of the system that has provided the city's water since 1934.
Proposition F would require the city to put together a plan to destroy the city-owned O'Shaughnessy Dam and drain Hetch Hetchy Reservoir so that the valley, part of Yosemite National Park, can be restored to its original wild state.
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