what causes flooding? you know what a flood is ….?? dont you?? well, can you identify three ways a...
TRANSCRIPT
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What causes Flooding?
You know what a flood is …. ??? Don’t you??
Well, can you identify three ways a flood can be caused??
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W.A.L.T???
“Today we are learning about the different ways flooding is caused”
W.I.L.F???
• listen and make notes during PowerPoint
• carefully craft some written work afterwards
• (think of special terms for our GeoBingo)
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What causes Flooding?
The river has overtopped its banks and spilled onto the flood plain.
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Exceptionally heavy rain
Boscastle, U.K.
summer 2004
= flash flood.
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Flash Flood in a dry desert area (S.W. U.S.A.)
Heavy rain onto dry hard ground.
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Snow Melt flood in Spring thaw.
e.g. The Yukon River in Alaska, U.S.A.
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Monsoon wet season
Essential for rice growing
But bad if there is too much rain.
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After a Dam Collapses:
Teton Dan USA. 1976Humans to blame
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Los Angeles U.S.A.
Humans to Blame
As cities get bigger there is more impermeable concrete and tarmac. The rain can’t soak into the ground.
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Nepal -deforestation
More people
More farmland needed
Trees cut down
Terraces made on hillsides
Landslides and more run-off
More risk of flooding
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High Tides can cause the sea to flood the land in a storm surge.
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Hurricanes cause storm surges too!
e.g. Florida U.S.A.
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Tsunami Flooding
Submarine earthquakes cause giant tidal waves
e.g. S.E. Asia 2004
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Cyclone hits Bangladesh
Bangladesh has monsoon river floods and cyclone sea floods. Coastal areas have some concrete shelters.
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Tropical Islands threatened by sea level rise caused by Global Warming. e.g. The Maldives
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GeoBingo1.
2.
3.
4.
5.
5.
6.
7.
8.
9.
10.
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GeoBingo1. Flood plain
2. Boscastle
3. Flash flood
4. Snow melt
5. Los Angeles
5. impermeable
6. deforestation
7. Florida
8. Monsoon
9. wadi
10.storm surge