Construction of tunnels for California's Bay Delta Conservation Plan is expected to cost $24.54 billion, a half billion dollars more than earlier estimates, according to state water officials. The water project would create $5 billion in benefits over a 50-year period, according to a California Natural Resources Agency report. "The Bay Delta Conservation Plan is an investment in securing water supply for two-thirds of California -- about 25 million people," said California Natural Resources Agency spokesman Richard Stapler.

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