"The California Drought: Water and Power"
The drought is currently bad and some people think it's likely to get a lot worse. For more details, see "6 Crazy Photos That Show Why California Is Desperate For Rain". (But there was finally some rain last week.)
The problem is that SoCal, in its natural state, is basically a desert.
For one of the terrible, terrible consequences of the drought, see "Weed Prices Could Double Because of Drought".
For a very long piece on the past, present, and future of California's water system, see "American Aqueduct: The Great California Water Saga".