reservoirs

Decades-old rules mean most reservoirs aren't allowed to fill up in the winter. A new approach using weather forecasts is helping some save more water to help with California's drought.

Getty Images photographer Justin Sullivan's "before-and-after" images show how recent rains in California swelled formerly dry reservoirs and turned brown landscapes green.

When it comes to dam safety, human eyes are still one of the best tools to recognize problems — so in some areas, workers live in remote locations to watch over the water supply.