EJIDO FRANCISCO MURGUÍA, Mexico — Beside a canal that runs through farmland, rushing water roared through an irrigation gate and flowed down a concrete culvert toward a wetland fringed with cottonwoods and willows.
For decades, so much water has been diverted to supply farms and cities that the Colorado River has seldom met the sea and much of its delta in Mexico has been reduced to a dry riverbed, with only small remnants of its once-vast wetlands surviving.
Over the past eight weeks, water has been flowing in parts of the delta once again, restoring a stretch of river in Mexico where previously there had been miles of desert sand.
