Did you know that Dallas-Fort Worth, home to over 8 million people, is sinking? North Texas residents are among roughly 34 million Americans whose cities are sinking into the Earth, according to a new report published in the journal .
Researchers used satellite-based radar measurements to analyze the rate of subsidence underneath our nation’s most densely populated cities.
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WATCH HEREThe study found that all 28 of the U.S.'s most populous cities are sinking, posing worsening flooding risks and damage to urban infrastructure.
What did the study find?
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SIGN UP The study found that in all 28 cities examined (each with a population of more than 600,000), at least 20% of the area was sinking, and in 25 of them, at least 65% was subsiding.
The largest city in the United States, New York City, a coastal city, sank 2.5 millimeters. While Los Angeles, another coastal city, sank less than 1 millimeter. Inland city Chicago sank just over 2 millimeters.
According to the study, Houston is the fastest-sinking city in the nation, with "more than 40% of its area subsiding more than 5 millimeters per year, and 12% sinking at twice that rate." Five millimeters is about two-tenths of an inch.
Dallas and Fort Worth had the highest rates of any inland cities, with an average of more than 4 millimeters per year, or about .16 inches.
for how the study's authors designated whether a city is coastal, inland, or near a major river.
Why are cities sinking?
Groundwater extraction seems to be the top contributor behind America's sinking cities, according to the study.
That means cities can make a big difference by practicing better groundwater management by balancing withdrawals with rainfall that replenishes underground aquifers.
Also, oil and gas extraction can deflate the ground in a similar way to groundwater extraction.
The weight of a city's buildings and other infrastructure can also lead to sinking.
