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Scars left by wildfires worsen flooding in Colorado
Sep. 12, 2013 at 12:12 PM ET
NASA
A satellite spied the burned-out scar left by Colorado's Waldo Canyon fire on July 4.
Boulder, Colo., is getting absolutely drenched — since Wednesday night, an incredible 5 to 10 inches (13 to 25 centimeters) of rain have fallen in the city and its surrounding areas, and the deluge continues.
The downpour has caused flash floods throughout the Boulder area and killed two people, according to news reports. Many roads throughout the area are impassible, and most businesses and schools throughout the region have closed.
But one factor has made the flooding considerably worse: the wildfires that have stricken the forests in the region in the past few years, said Kari Bowen, a meteorologist with the National Weather Service (NWS) office in Boulder.
"When you have a dense forest with undergrowth, you have plants and things to trap moisture and rain," Bowen told LiveScience. "But when it's gone, you have nothing to catch it." The fire also makes the ground almost hydrophobic, or water-repelling, and these effects can last 10 to 15 years, she added. [Photos: Devastating Colorado Wildfires]
This means that when large quantities of rain fall, the water runs off the ground as it would off a sheet of metal. Even a half inch (1.3 cm) of rain can cause flooding when it falls in a short amount of time, not to mention the current onslaught of precipitation, Bowen said. The mountainous topography of the area worsens the flooding, channeling it into valleys and sending it screaming down the slopes.
Perhaps unsurprisingly, then, the flooding is worse in some areas that have seen forest fires in recent years, including the High Park area and Waldo Canyon, the scene of fires of the same name in June 2012. The Waldo Canyon fire was the worst in the state's history to that date, burning more than 18,000 acres (7,300 hectares) near Colorado Springs and destroying more than 300 homes.
The burn scars from these fires are also at increased risk of debris flows and mudslides for the same reason: Water quickly runs off, and there are fewer plants to hold rocks and soil in place. "The water carries soil and rocks and dead trees, and causes a lot of destruction," Bowen said.
Published on Jun 22, 2013
SOURCE: http://www.nbcnews.com
News Articles:
Massive wildfire threatening to destroy Colorado mountain town
http://www.foxnews.com/us/2013/06/21/...
Entire Town Could Be Totally Wiped Out By Colorado Wildfire
http://www.businessinsider.com/south-...
South Fork: Colorado Fire May Destroy Entire Town
http://www.inquisitr.com/808629/south...
FAIR USE NOTICE: This video may contain copyrighted material. Such material is made available for educational purposes only. This constitutes a 'fair use' of any such copyrighted material as provided for in Title 17 U.S.C. section 106A-117 of the U.S. Copyright Law.
News Articles:
Massive wildfire threatening to destroy Colorado mountain town
http://www.foxnews.com/us/2013/06/21/...
Entire Town Could Be Totally Wiped Out By Colorado Wildfire
http://www.businessinsider.com/south-...
South Fork: Colorado Fire May Destroy Entire Town
http://www.inquisitr.com/808629/south...
FAIR USE NOTICE: This video may contain copyrighted material. Such material is made available for educational purposes only. This constitutes a 'fair use' of any such copyrighted material as provided for in Title 17 U.S.C. section 106A-117 of the U.S. Copyright Law.
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