7 ways to try to wrap your head around the billions of gallons of water Harvey has dumped on Houston
Houston is a mostly flat, rapidly growing city about 35 feet above sea level that has struggled to keep up with its flood-amelioration infrastructure, but it's hard to imagine a city that could handle up to 50 inches of rain in a week, much less the average of 33 inches that Tropical Storm Harvey has already dropped on Houston's Harris County.
Harvey will likely "produce more rain than we have ever seen before in the U.S. from a tropical system, and over the fourth-largest city in the country," Eric Fisher, chief meteorologist at Boston's WBZ-TV, tells The Washington Post. "It's hard, if not impossible, to compare this to any other storm." It's also hard to visualize the 9 trillion gallons of water that the Post calculates Harvey had already dumped on Houston and southeast Texas by Monday morning, with 5-10 trillion more gallons expected this week. Still, people are trying.
For example, USA Today points out, 26 inches of rain on Harris County would "provide drinking water for the entire county for roughly five years." During Hurricane Katrina, The Times-Picayune notes, New Orleans got up to 13 inches of rain, and even with the storm surge that caused most of the flooding, the total floodwater in New Orleans and surrounding parishes was an estimated 282 billion gallons. Harris County Flood Control District official Jeff Lindner says about 732 billion gallons of water have already fallen on Harris County.
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Matthew Cappucci at The Washington Post says if you took the water that's fallen on Texas and dumped it onto New Orleans, instead of the 10-20 feet of flooding the city saw during Katrina, New Orleans would be buried under 128 feet of water. He has more comparisons:
You can find more mind-bending analogies at The Washington Post.
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Peter has worked as a news and culture writer and editor at The Week since the site's launch in 2008. He covers politics, world affairs, religion and cultural currents. His journalism career began as a copy editor at a financial newswire and has included editorial positions at The New York Times Magazine, Facts on File, and Oregon State University.
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