… Today, continued technological advances are needed to ensure this goal can be achieved even while facing significant environmental challenges that pose a threat to the future of essential water resources. One major focus of such an endeavor is the Colorado River Basin, on which Arizona and six other states in the U.S. Southwest — California, Colorado, Nevada, New Mexico, Utah and Wyoming — and a sizable swath of neighboring Mexico depend heavily for water supplies. A recent article in the Water Resources Research international hydrology science journal, “On the Sensitivity of Future Hydrology in the Colorado River to the Selection of the Precipitation Partitioning Method,” reports that expected smaller snowpack levels will reduce the basin’s streamflows to seriously problematic low levels.