NOVA: Killer Floods
Airs Wednesday, April 22, 2020 at 10 p.m. & Sunday, April 26 at 2 p.m. on KPBS TV + Thursday, April 23 at Noon & Sunday, April 26 at 9 p.m. on KPBS 2 + PBS Video App
Tuesday, April 21, 2020
Credit: Courtesy of Blink Films
—Scientists Uncover Geologic Fingerprints Of Colossal Floods That Ripped Through Ancient Landscapes—
All over the world, scientists are discovering traces of ancient floods on a scale that dwarfs even the most severe flood disasters of recent times.
What triggered these cataclysmic floods, and could they strike again?
Over a vast expanse of Washington State called the Channeled Scablands, the level prairie gives way to bizarre, gargantuan rock formations: house-sized boulders seemingly dropped from the sky; a cliff carved by a waterfall twice the height of Niagara; and potholes resembling ones scoured out by rivers today, but ten times bigger.
Like forensic detectives at a crime scene, geologists study these strange features and reconstruct catastrophic Ice Age floods more powerful than all the world’s top ten rivers combined.
NOVA follows their efforts to uncover the geologic fingerprints of other colossal megafloods in Iceland and — improbably — on the seabed of the English Channel, where hundreds of thousands of years ago, another deluge smashed through a land bridge connecting Britain and France and turned Britain into an island for the first time.
These great disasters ripped through terrain and transformed continents in a matter of hours—and similar forces reawakened by climate change are posing an active threat to mountain communities throughout the world today.
Watch On Your Schedule:
With the PBS Video App, you can stream your favorite and local station shows. Download it for free on your favorite device. The app allows you to catch up on recent episodes and discover award-winning shows.
Episodes are available for viewing on demand for a limited time after each broadcast. Extend your viewing window with KPBS Passport, video streaming for members supporting KPBS at $60 or more yearly, using your computer, smartphone, tablet, Roku, AppleTV, Amazon Fire or Chromecast. Learn how to activate your benefit now.
Join The Conversation:
To view PDF documents, Download Acrobat Reader.