Floods, Floodplains & Levees

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Presentation transcript:

Floods, Floodplains & Levees Let’s take a look…

Floodplains A floodplain is the land surrounding a waterway, into which flood waters spill.

Floodplains  In this riverbed map, the river is in blue. Over time and with flooding, a river changes its course. It moves in and out of its floodplain.

Floodplains When rivers flow through areas where many people live and work, what happens when the rivers flood?

Flooding Flooding becomes a problem in areas with many people. A flooded Mississippi River in Illinois, 1993. Downtown New Orleans after hurricane Katrina, 2005.

People with shovels repairing a Mississippi levee, 1903. Levees Engineers design and build levees, dams and dikes to keep fast-moving and dangerous flood waters away from people’s homes and roads. People with shovels repairing a Mississippi levee, 1903.

Levees The power of water is strong. Look at these broken levees:

Image sources Source: Copyright © Copyright © Northwest Fisheries Science Center, NOAA, http://www.nwfsc.noaa.gov/research/divisions/ec/wpg/offchannel.cfm. Caption: An urbanized river cut off from its floodplain. Source: Copyright © National Park Service, http://www.nps.gov/ncrc/portals/rivers/projpg/flood.htm. Source: Copyright © FEMA, http://www.fema.gov/kids/p_fld.htm. Source: Copyright © U.S. Navy, URL:http://en.wikipedia.org/wiki/Image:Navy-FloodedNewOrleans.jpg.

Image sources (continued) Source: Copyright © California Department of Water Resources, http://www.sacramentoriver.ca.gov/gis_system.html. Floodplain and meander history Source: Source: Copyright © Sean Linehan, NOAA, http://www.photolib.noaa.gov/historic/nws/wea00764.htm. Repairing a Mississippi levee, 1903. Source: Copyright © Department of Water Resources, State of California, http://www.publicaffairs.water.ca.gov/newsreleases/2005/07-22-05wheeler.cfm. Source: Copyright © NOAA, http://www.wrh.noaa.gov/hnx/newslet/winter02/remember.htm.