California’s water wars aren’t about scarcity. Even with 37 million people and the nation’s most irrigation-intensive agriculture, the state usually has enough water for both people and crops, thanks to the brilliant hydrological engineering of past Californians. But now there is a new element in the century-old water calculus: a demand that the state’s inland waters flow as pristinely as they supposedly did before the age of dams, reservoirs and canals…

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