BERKELEY —When visiting Sherman Island in the Sacramento-San Joaquin River Delta, it is easy to forget the region’s ever-present threat of catastrophic floods and instead revel in the West Coast’s largest estuary, which supports farmers, anglers, and more than 700 native species of plants and animals, including some that are endangered.

"You drive out there and you see that cows are grazing, birds are chirping; but it’s deceptive," said Robert Bea, professor of civil and environmental engineering at the University of California, Berkeley. "As you start to dig in, you find out how incredibly complex and vulnerable we’ve made this place."

At least 220 government agencies have jurisdiction in the Delta, which is home to half a million residents in 25 villages, towns and cities, including Sacramento, Stockton and Pittsburg. The region is under continual threat from floods, prevented only by a vast — and fragile — network of earthen levees.

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