A huge amount of the water that flows down from Colorado’s snowy mountains into the West’s depleted Lake Powell reservoir is rocketing out of pipes this week to power a massive, simulated flood through the Grand Canyon — the first one in five years to try to revitalize canyon ecosystems the way nature once did.
Federal operators of the Glen Canyon Dam atop the Grand Canyon opened jets to begin this surge before sunrise Monday, sending what they described as “a pulse” of water whooshing through the Colorado River as it curves through the base of the canyon.
U.S. Bureau of Reclamation officials said they’ll maintain the surge until Thursday evening, ensuring a flow for 72 hours at 39,500 cubic feet per second of water...