http://www.calwater.ca.gov/Programs/LeveeSystemIntegrity/LeveeSystemMain.shtml

Levees of the Delta were built after the Gold Rush to reclaim a vast wetland for farming. The levees are fragile and at the mercy of natural and man-made perils. They must be maintained and repaired so they provide security against flooding of homes, farmlands and business that have located in their shadow. And they are a focal point for differing views on how best to satisfy Californias need for reliable water supplies and to safeguard its environment and Delta-sensitive economy.

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