Flash flooding causes major damage to the Grand Canyon's critical water pipeline

The sole pipeline that supplies water for millions of Grand Canyon visitors was badly damaged by weekend flash flooding, setting up a tricky repair scenario and upending a yearslong construction project to upgrade the line laid over terrain so rugged helicopters are often required to make basic fixes. Park officials said roughly 40 percent of the pipeline was damaged or destroyed. The long-term implications of the damage to the park's infrastructure , visitors and year-round residents weren't im