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What causes Flooding? You know what a flood is …. ??? Dont you?? Well, can you identify three ways a flood can be caused??

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Presentation on theme: "What causes Flooding? You know what a flood is …. ??? Dont you?? Well, can you identify three ways a flood can be caused??"— Presentation transcript:

1 What causes Flooding? You know what a flood is …. ??? Dont you?? Well, can you identify three ways a flood can be caused??

2 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)

3 What causes Flooding? The river has overtopped its banks and spilled onto the flood plain.

4 Exceptionally heavy rain Boscastle, U.K. summer 2004 = flash flood.

5 Flash Flood in a dry desert area (S.W. U.S.A.) Heavy rain onto dry hard ground.

6 Snow Melt flood in Spring thaw. e.g. The Yukon River in Alaska, U.S.A.

7 Monsoon wet season Essential for rice growing But bad if there is too much rain.

8 After a Dam Collapses: Teton Dan USA Humans to blame

9 Los Angeles U.S.A. Humans to Blame As cities get bigger there is more impermeable concrete and tarmac. The rain cant soak into the ground.

10 Nepal - deforestation More people More farmland needed Trees cut down Terraces made on hillsides Landslides and more run-off More risk of flooding

11 High Tides can cause the sea to flood the land in a storm surge.

12 Hurricanes cause storm surges too! e.g. Florida U.S.A.

13 Tsunami Flooding Submarine earthquakes cause giant tidal waves e.g. S.E. Asia 2004

14 Cyclone hits Bangladesh Bangladesh has monsoon river floods and cyclone sea floods. Coastal areas have some concrete shelters.

15 Tropical Islands threatened by sea level rise caused by Global Warming. e.g. The Maldives

16 GeoBingo

17 GeoBingo 1. 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


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