CANANEA, Sonora — The day was windless. Long brown grasses speckled the landscape, and a stray tree erupted from the earth. The river channel was rusty, bone-dry. A pond that swells with summer rain glimmered on the horizon, but local rancher Eduardo Ríos Colores pointed toward the mountains, his finger tracing the route of a bone-dry streambed cutting through the landscape. “There was a time when this stream didn’t exist,” he said. “There used to be a lot of trees, and all the trees prevented erosion from the water. But … the trees have been drying up.” It was difficult to imagine the streambed swollen, rain-choked. But water in this region comes in all at once, in a deluge. As it races across the landscape, it forms deep channels like this one, creating sandy areas where new plants can’t grow. The land soon fails to support life, from the native grasses to migratory birds to the cattle that are the lifeline of ranchers like Ríos Colores. “Many people say that when water flows, it shouldn’t flow straight,” he continued. “Those serve to divert the water … so the current flows like a snake.” He was referring to his trincheras — hundreds of small rock structures peppering the streambed. The small, permeable barriers go on for more than a mile, spanning the channel, each small weir composed of dozens of fist-sized rocks. The trincheras, the Spanish word for “entrenchments,” were built in 2021 to slow down water, raising the water table…This article was originally published on Mongabay