Study tracks Hurricane Harvey stormwater with GPS | 9/20/2018 | Staff
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Hurricane Harvey dumped more than 5 feet (1.5 meters) of water on southeast Texas in late August 2017, making it the wettest recorded hurricane in U.S. history. But after the storm passed, where did all that water go?

In a new, NASA-led study, scientists used Global Positioning System (GPS) data to answer that question and to track not just where Harvey's stormwater ended up on land, but also how long it took to dissipate.

Days - Percent - Harvey - Stormwater - Land—most

"We determined that in the first eight days post-landfall, 30 percent of Harvey's stormwater was captured or stored on land—most as standing water that sits on the surface. Around 60 percent was lost or drained into the ocean and Galveston Bay over the first few days after the storm, and the remaining 10 percent was lost via evapotranspiration, or a combination of evaporation and plant transpiration," said first author Chris Milliner of NASA's Jet Propulsion Laboratory in Pasadena, California.

The 30 percent of water that was stored on land then gradually dissipated over a period of about five weeks, likely through evapotranspiration, groundwater runoff into nearby rivers and the replenishment of aquifers.

Satellites - Receivers - Ground - Stations - World

Made up of satellites, receivers and ground stations located around the world, GPS allows scientists to measure changes in Earth's surface elevation to an accuracy of less than an inch (a few millimeters). It works much like GPS on your mobile phone but with greater accuracy. The study team used daily elevation measurements from about 220 of these ground stations, from western Texas to Louisiana, to track changes in the amount of stormwater on land after the hurricane.

"When you sit on a mattress, your weight depresses its surface. Earth's crust is also elastic and behaves in a similar way under the weight of water," said Milliner. "GPS is measuring the amount of subsidence (or depression), which tells you...
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