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Flood Presentation

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by

Brittany Hager

on 10 April 2013

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Transcript of Flood Presentation

The Simple Facts about Floods What is a flood? Which method do you believe is better? Benefits of a flood The best thing to do during a flood. A flood is an overflow of water that submerges or drowns land.

The European Union Floods Directive defines a flood as a covering by water of land not normally covered by water.

The dictionary defines a flood as: An overflowing of a large amount of water beyond its normal confines. Stationary Fronts and Flooding A stationary front normally has a lot of precipitation which often causes many flash floods. Some stationary fronts where there is a lot of water vapor in the warmer air mass, significant rain or freezing rain can occur. Some of the worst ice storms and flooding in the Southeast occur in these conditions because rain falls continuously over an area for several days as the front stays in one place. Flood Control Defenses such as
levees- An embankment built to prevent the overflow of a river. (workers pile dirt or concrete along the river banks to prevent water flow)
reservoirs- A large natural or artificial lake used as a source of water supply. (impermeable lining or core, often made of puddled clay)
& weirs-A low dam built across a river to raise the level of water upstream or regulate its flow.
are used to prevent waterways from overflowing their banks.

When these defenses fail, emergency measures such as sandbags or portable inflatable tubes are often used to try and stem flooding. Effects of a flood the immediate impacts of flooding include:
-loss of human life
-damage to property
-destruction of crops
-loss of livestock
-deterioration of health conditions (owing to waterborne diseases) Have a 3-5 minute discussion on which method for controlling a flood is better in your opinion and why. When a warm air mass and a cold air mass collide they cause storms and a large amount of precipitation. This often cause flash floods. -levees
-reservoirs
-weirs Masses and Flooding Although a flood is destructive it also brings many benefits along with it. Such as recharging ground water, making soil more fertile and increasing nutrients in some soils. Flood waters provide much needed water resources in arid and semi-arid regions where precipitation can be very unevenly distributed throughout the year. Freshwater floods particularly play an important role in maintaining ecosystems in river corridors and are a key factor in maintaining floodplain biodiversity. Flooding can spread nutrients to lakes and rivers, which can lead to increased biomass and improved fisheries for a few years. If flooding occurs, go to higher ground and avoid areas subject to flooding.
Do not attempt to walk across flowing streams or drive through flooded roadways.
If water rises in your home before you evacuate, go to the top floor, attic, or roof.
Listen to a battery-operated radio for the latest storm information.
Turn off all utilities at the main power switch and close the main gas valve if advised to do so.
If you've come in contact with floodwater, wash your hands with soap and disinfected water. Deadliest Floods #1 1931 China flood
#2 1887 Yellow River (Huang He) flood
#3 1938 Yellow River (Huang He) flood
#4 1935 Yangtze river flood
#5 St. Felix's Flood Death Toll 1. 2,500,000–3,700,000
2. 900,000–2,000,000
3. 500,000–700,000
4. 86,000 died from flooding and 145,000 died from disease
5. 100,000+ A total of 32,047 flash flood/flood events were recorded in the U.S Flood Types Flash floods
Coastal floods
Urban floods
River (or fluvial) floods
Ponding (or pluvial flooding)
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