Colorado River Headwaters: Snow Loss and Groundwater Reliance
• Colorado River headwaters increasingly rely on old groundwater due to warming temperatures and snow loss.
• Reduced snowpack leads to less meltwater percolating into groundwater, increasing reliance on older reserves.
• Effective water resource management strategies are crucial for ensuring sustainable water availability in the Colorado River Basin.
Study reveals dependence on old groundwater sources
A recent study in Nature reveals Colorado River headwaters increasingly depend on old groundwater due to rising temperatures and diminished snowpack. The East River watershed, a Gunnison River tributary, underwent thorough hydrological investigations. Since 1986, the region's average annual temperature rose 0.44°C per decade, with precipitation mainly as snow. Despite stable annual precipitation, fall precipitation increased. The ParFlow-CLM model simulated hydrological dynamics, revealing significant shifts in water partitioning from climate change.
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