The California Supreme Court rejected a conservation group’s lawsuit Wednesday seeking to drain Yosemite’s Hetch Hetchy Reservoir, a source of water for San Francisco and surrounding Bay Area communities. Restore Hetch Hetchy, a Berkeley group, argued in its suit that the location of the dam and reservoir, which flooded a valley in the park after construction in 1923, violates a provision of the California Constitution requiring reasonable water use. But a state appeals court in Fresno ruled in July that Congress had overridden state laws when it authorized construction of the dam and reservoir.