The Western US is an empire built on snow. And that snow is vanishing.
Since most of the region gets little rain in the summer, even in good years, its bustling cities and bountiful farms all hinge on fall and winter snow settling in the mountains before slowly melting into rivers and reservoirs.
There’s still snow in Colorado’s mountains near the headwaters of the South Platte River, and Brian Domonkos has strapped on a pair of cross-country skis to come measure it.
He’s the Colorado Snow Survey supervisor, and knowing how much snowpack is left from the winter to runoff into streams, rivers and reservoirs this summer is crucial, especially in a year when much of the West is in extreme drought. As it melts, the snowpack here will become the primary source of water for millions of people in Colorado and across the West.
The scale of the drought hitting the American West is beginning to crystallize as Nevada, New Mexico and Arizona experienced their driest year in terms of precipitation on record, according to the National Center for Environmental Information.
In Utah and California, it was the second-driest winter on record. For Wyoming, it was the third-driest ever. For Colorado, only three winters were ever drier in the 127-year history of record-keeping at the center.
“This is extreme,” said Peter Gleick of the Pacific Institute.
Come spring, the American West’s vast water reservoirs are supposed to fill with melting snow. However this year, as in recent years, the large reservoirs of Lake Mead and Lake Powell in the Colorado River basin have seen declining water levels — an ominous trend that a new study warns could signal a looming megadrought.
For decades, scientists have thought that changes in snowmelt due to climate change could negatively impact agriculture. Now, a new study reveals the risks to agriculture around the world from changes in snowmelt, finding that farmers in parts of the western United States who rely on snowmelt to help irrigate crops will be among the hardest hit in the world by climate change.
In a study published April 20 in Nature Climate Change, an interdisciplinary team of researchers analyzed monthly irrigation water demand with snowmelt runoff across global basins from 1985 to 2015. The goal was to determine where irrigated agriculture has depended on snowmelt runoff in the past and how that might change with a warming climate.
Farmers in parts of the western United States who rely on snowmelt to help irrigate their crops will be among the hardest hit in the world by climate change, a new study reveals.
The Water News Network is San Diego County’s source for water news and information.
