Myth vs Reality: Floods and Levees

Produced by the Space Telescope Science Institute’s Office of Public Outreach in collaboration with the NASA Earth Observatory.

All images, illustrations, and videos courtesy of NASA except:

·       Illustration of northwestern U.S. based on illustration from NOVA/WGBH “Mystery of the Megaflood” website

·       Glacial Lake Missoula painting courtesy of Byron Pickering

·       Dry Falls photo ©2004 Teri J. Pieper, www.byways.org

·       Palouse Hills photo courtesy of Lynn Suckow

·       Sea creature illustration copyright The National Library of Israel, Shapell Family Digitization Project _and The Hebrew University of Jerusalem, Department of Geography – Historic Cities Research Project

·       Photos of Mississippi River with debris courtesy of Thomas R. Machnitzki

·       Video of clouds over eastern U.S. courtesy of National Oceanic and Atmospheric Administration

·       Snow-to-rain animation by Marc Lussier, STScI

·       Satellite images of flooding in Birds Point–New Madrid Floodway courtesy of MODIS Today,

·       Space Science and Engineering Center, University of Wisconsin-Madison

·       Morganza Spillway video and photos courtesy of the U.S. Army Corps of Engineers

·       Photo of Mississippi River sediment plume entering Gulf of Mexico courtesy of Nancy Rabalais/Louisiana Universities Marine Consortium

·       Algae bloom photo courtesy of National Ocean Service/NOAA

·       Photo of fish kill on Grand Isle, Louisiana, courtesy of Kerry St. Pé

·       Mississippi River dead zone animation courtesy of National Oceanic and Atmospheric Administration

·       Photo of flooded farm near Vicksburg, Mississippi, courtesy of the National Weather Service

·       Map of Mississippi River course changes courtesy of the U.S. Army Corps of Engineers

 

Music courtesy of Associated Production Music

Written by Andrea Gianopoulos

Designed by Marc Lussier

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[UPBEAT JAZZ MUSIC]

 

(DESCRIPTION)

A banner is outlined in blue for the title, Myth vs Reality and it is split into two sections. An illustration with sea serpents surrounding a ship is above Myth. A row of trees standing in a flooded area is above reality. A dark, rotating planet floats in the background at the bottom. The Myth side is highlighted. Text, Levees and spillways always reduce damage from flooding.

 

The reality side is highlighted. Text, Constraining a river's natural flow pattern with levees will make a swollen river flow faster. The high, fast-moving water can eat away at levees, causing a breach. Floodwaters that break through a levee travel faster and with more force than a slowly rising river in its natural channel.