Earths rivers slowing down due to human activity and geology

A novel approach to estimating river water storage and discharge also identifies regions marked by ‘fingerprints’ of intense water use. ... For decades, most estimates of Earth’s total river water were refinements of a 1974 United Nations figure. Better estimates have been hard to come by due to a lack of observations of the world’s rivers, particularly those far from human populations.

For 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. Better estimates have been hard to come by, David said, due to a lack of observations of the world’s rivers, particularly those far from human populations. Never Miss a DiscoverySUBSCRIBE TO THE JPL NEWSLETTER · Another issue has been that there are many more stream gauges monitoring the levels and flow of large rivers than there are of small ones.

A global database of 3,693 gages were used to determine the months when the rivers were commly near mean discharge; 7,376 Landsat THM, ETM+, and OLI scenes were capture during those months.

We used a global database of planform river hydromorphology and a statistical approach to show that global river and stream surface area at mean annual discharge is 773,000 ± 79,000 square kilometers (0.58 ± 0.06%) of Earth’s nonglaciated ...

The scientists estimated that the total volume of water in Earth’s rivers on average from 1980 to 2009 was 2,246 cubic kilometers (539 cubic miles). That’s equivalent to half of Lake Michigan’s water and about 0.006 percent of all fresh ...

There have only been a few other attempts to estimate the widths of all of the world’s rivers, and those efforts relied heavily on modeling and extrapolation rather than actual measurements. Using their Landsat-based technique to tally how much of Earth’s total surface is covered by rivers, Allen and Pavelsky came up with a surprisingly large number: 773,000 square kilometers (300,000 square miles), an area larger than Texas.

The volume of this sphere would be about 2,551,000 mi3(10,633,450 km3) and form a sphere about 169.5 miles (272.8 kilometers) in diameter. Yes, all of this water is fresh water, which we all need every day, but much of it is deep in the ground, unavailable to humans. Do you notice the "tiny" bubble over Atlanta, Georgia? That one represents fresh water in all the lakes and rivers on the planet.

The World's Water - Distribution of Earth's WaterThe Earth is a watery place. But just how much water exists on, in, and above our planet? About 71 percent of the Earth's surface is water-covered, and the oceans hold about 96.5 percent of all Earth's water. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog.This bar chart shows how almost all of Earth's water is saline and is found in the oceans.

The flow of water through the planet’s nearly 3 million rivers is changing rapidly, with potentially drastic implications for everything from drinking water supplies to flood risks, according to a new study.