{"id":6553,"date":"2025-07-13T11:33:13","date_gmt":"2025-07-13T11:33:13","guid":{"rendered":"https:\/\/www.newsbeep.com\/us\/6553\/"},"modified":"2025-07-13T11:33:13","modified_gmt":"2025-07-13T11:33:13","slug":"breaking-down-the-force-of-water-in-the-texas-floods","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/us\/6553\/","title":{"rendered":"Breaking down the force of water in the Texas floods"},"content":{"rendered":"

Over just two hours, the Guadalupe River at Comfort, Texas, rose from hip-height to three stories tall, sending water weighing as much as the Empire State Building downstream roughly every minute it remained at its crest.<\/p>\n

The\u00a0force of floodwater<\/a>\u00a0is often more powerful and surprising than people imagine.<\/p>\n

Comfort offers a good lens to consider the terrible force of a\u00a0flash flood\u2019s wall of water<\/a>\u00a0because it\u2019s downstream of where the river\u2019s rain-engorged branches met. The crest was among the highest ever recorded at the spot \u2014 flash flooding that appears so fast it can \u201cwarp our brains,\u201d said James Doss-Gollin, assistant professor of civil and environmental engineering at Rice University.<\/p>\n

The Texas flood smashed through buildings, carried away cars and ripped sturdy trees out by their roots, dropping the debris in twisted piles when the water finally ebbed. It\u00a0killed more than 100 people<\/a>, prompted scores of rescues and left dozens of others missing. The deaths were concentrated upriver in Kerr County, an area that includes Camp Mystic, the devastated girls\u2019 camp, where the water hit early and with little notice.<\/p>\n

Water is capable of such destruction because it is heavy and can move fast. Just one cubic foot of water \u2014 imagine a box a bit larger than the size of a basketball \u2014 weighs about 62 pounds. When the river rose to its peak at Comfort, 177,000 cubic feet \u2014 or 11 million pounds of water \u2014 flowed by every second.<\/p>\n

\u201cWhen you have that little lead time … that means you can\u2019t wait until the water level starts to rise,\u201d Doss-Gollin said. \u201cYou need to take proactive measures to get people to safety.\u201d<\/p>\n

Water as heavy as a jumbo jet<\/p>\n

A small amount of water \u2014 less than many might think \u2014 can sweep away people, cars and homes. Six inches is enough to knock people off their feet. A couple of feet of fast-moving water can take away an SUV or truck, and even less can move cars.<\/p>\n

\u201cSuppose you are in a normal car, a normal sedan, and a semitrailer comes and pushes you at the back of the car. That\u2019s the kind of force you\u2019re talking about,\u201d said Venkataraman Lakshmi, a University of Virginia professor and president of the hydrology section of the American Geophysical Union.<\/p>\n

And at Comfort, it took just over 15 minutes for so much water to arrive that not only could it float away a large pickup truck, but structures were in danger \u2014 water as heavy as a jumbo jet moved by every second.<\/p>\n

At that point, \u201cWe are past vehicles, homes and things can start being affected,\u201d said Daniel Henz, flood warning program manager at the flood control district of Maricopa County, Arizona, an area that gets dangerous, scary flash floods.<\/p>\n

The water not only pushes objects but floats them, and that can actually be scarier. The feeling of being pushed is felt immediately, letting a person know they are in danger. Upward force may not be felt until it is overwhelming, according to Upmanu Lall, a water expert at Arizona State University and Columbia University.<\/p>\n

\u201cThe buoyancy happens \u2014 it\u2019s like a yes, no situation. If the water reaches a certain depth and it has some velocity, you\u2019re going to get knocked off (your feet) and floating simultaneously,\u201d he said.<\/p>\n

The mechanics of a flash flood<\/p>\n

The landscape<\/a>\u00a0created the conditions for what some witnesses described as a fast-moving wall of water.<\/p>\n

Lots of limestone covered by a thin layer of soil in hilly country meant that when rain fell, it rushed downhill with little of it absorbed by the ground, according to S. Jeffress Williams, senior scientist emeritus with the U.S. Geological Survey.<\/p>\n

A flash flood generally starts with an initial lead wave and then builds as rain rushes over the landscape and into the river basin. It may rise quickly, but the water still takes some time to converge.<\/p>\n

The water crumpled cars into piles, twisted steel and knocked trees down as if they were strands of grass. Images captured the chaos and randomness of the water\u2019s violence.<\/p>\n

And then, not as fast as it rose, but still quickly, the river receded.<\/p>\n

Five hours after its crest at Comfort, it had already dropped 10 feet, revealing its damage in retreat. A couple of days after it started to rise, a person could stand with their head above the river again.<\/p>\n

\u201cEverything just can happen, very, very quickly,\u201d Henz said.<\/p>\n","protected":false},"excerpt":{"rendered":"Over just two hours, the Guadalupe River at Comfort, Texas, rose from hip-height to three stories tall, sending…\n","protected":false},"author":2,"featured_media":6554,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[2721,2723,2724,6778,4,450,1062,451,3,6999,1022,7000,452,453,2986,7001],"class_list":["post-6553","post","type-post","status-publish","format-standard","has-post-thumbnail","category-breaking-news","tag-all-markets-rank-everywhere","tag-app-for-your-consideration","tag-associated-press","tag-austin","tag-breaking-news","tag-breakingnews","tag-dallas","tag-headlines","tag-news","tag-san-antonio","tag-texas","tag-texas-floods","tag-top-stories","tag-topstories","tag-weather","tag-weather-news"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/6553","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=6553"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/6553\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/6554"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=6553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=6553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=6553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}