SAN DIEGO (CBS/AP) — California officials have proposed spending nearly $400 million over 10 years to slow the shrinkage of the state’s largest lake.

Gov. Jerry Brown’s administration on Thursday unveiled a plan to build ponds on the northern and southern ends of the Salton Sea.

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It is expected to evaporate at an accelerated pace starting next year when the San Diego region no longer diverts water to the desert region.

The state has so far committed $80 million. That leaves a shortfall of more than $300 million.

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San Diego agreed to send water to the lake through 2017 as part of a landmark deal to buy Colorado River water from California’s Imperial Valley, which includes the lake.

More exposed lakebed is likely to result in respiratory problems for residents who breathe dust.

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