The Colorado River supplies water to more than 40 million people as it snakes through seven U.S. states, including the part of southeastern Utah seen in this photo snapped by an astronaut aboard the International Space Station. The Colorado basin was identified in a NASA-led study as a region experiencing intense human water use. Credit: NASA
A NASA-led study combined stream-gauge measurements with computer models of 3 million river segments to create a global picture of how much water Earth’s rivers hold. It estimated that the Amazon basin contains about 38% of the world’s river water, the most of any hydrological region evaluated.
“These are locations where we’re seeing fingerprints of water management,” said lead author Elyssa Collins, who conducted the analysis as a JPL intern and doctoral student atFor decades, most estimates of Earth’s total river water were refinements of a 1974 United Nations figure, and no study has illustrated how the amount has varied with time.
Then they modeled the runoff through rivers on a high-resolution global map developed using land-elevation data and imagery from space, including from. This approach yielded discharge rates, which were used to estimate average and monthly storage for individual rivers and the planet’s rivers in total.
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