How can you manage floods?
There is no perfect way to protect floods.  The traditional choices are…. <ul><li>To build flood defences </li></ul><ul><l...
Dams <ul><li>These trap and store water, and let it out in a controlled way. </li></ul><ul><li>They can generate electrici...
Embankments <ul><li>These are raised banks along the river. </li></ul><ul><li>They effectively make the river deeper so it...
Flood walls <ul><li>These are built around settlements and important factories or roads. </li></ul><ul><li>They are quite ...
Straightening and deepening the river <ul><li>This is called channelising the river. </li></ul><ul><li>It makes the water ...
Storage areas <ul><li>The water can be pumped out of the river and stored in temporary lakes. </li></ul><ul><li>Then it is...
Soft Management
Washlands <ul><li>These are parts of the floodplain that are allowed to flood. </li></ul><ul><li>They can’t be built on. <...
Land-use zoning <ul><li>This is where land has different building controls depending on how far away from the river it is....
Afforestation <ul><li>This is re-planting trees in the catchment </li></ul>
Warning Systems <ul><li>Warnings are issued by the Environmental Agency (in the UK) so that local people can put sandbags ...
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How Can You Manage Floods

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How Can You Manage Floods

  1. 1. How can you manage floods?
  2. 2. There is no perfect way to protect floods. The traditional choices are…. <ul><li>To build flood defences </li></ul><ul><li>To straighten and deepen the river and cut off meanders </li></ul><ul><li>To make storage areas for extra water </li></ul><ul><li>These are all called hard management. </li></ul><ul><li>The types of hard management are…… </li></ul>
  3. 3. Dams <ul><li>These trap and store water, and let it out in a controlled way. </li></ul><ul><li>They can generate electricity. </li></ul><ul><li>Upstream of the dam the land floods to make a reservoir. </li></ul><ul><li>They are expensive but very effective </li></ul><ul><li>Makes a massive change to the ecosystem </li></ul>
  4. 4. Embankments <ul><li>These are raised banks along the river. </li></ul><ul><li>They effectively make the river deeper so it can hold more water before it floods. </li></ul><ul><li>They are expensive and don’t look natural. </li></ul><ul><li>They do protect the land around them. </li></ul>
  5. 5. Flood walls <ul><li>These are built around settlements and important factories or roads. </li></ul><ul><li>They are quite expensive and don’t look very natural. </li></ul><ul><li>They are pretty effective. </li></ul>
  6. 6. Straightening and deepening the river <ul><li>This is called channelising the river. </li></ul><ul><li>It makes the water move through the river faster. </li></ul><ul><li>So it doesn’t build up and is less likely to flood. </li></ul><ul><li>Changes the ecosystem in the river and spoils the natural look. </li></ul><ul><li>Further downstream, where the river is not channelised the water builds up and floods. </li></ul>
  7. 7. Storage areas <ul><li>The water can be pumped out of the river and stored in temporary lakes. </li></ul><ul><li>Then it is pumped back in after the water in the river has gone down a bit. </li></ul><ul><li>Effective, but you need to have a large bit of spare land that isn’t used, so that you can flood it! </li></ul>Area of land
  8. 8. Soft Management
  9. 9. Washlands <ul><li>These are parts of the floodplain that are allowed to flood. </li></ul><ul><li>They can’t be built on. </li></ul><ul><li>They are usually used for sports pitches or nature reserves. </li></ul>Area of land at Swanage set aside to flood if needed.
  10. 10. Land-use zoning <ul><li>This is where land has different building controls depending on how far away from the river it is. </li></ul><ul><li>Land next to the river isn’t allowed to be used for building, the next land can be but only for low-risk housing. </li></ul><ul><li>The last zone is for high-risk buildings like hospitals, old peoples homes and dangerous factories </li></ul>
  11. 11. Afforestation <ul><li>This is re-planting trees in the catchment </li></ul>
  12. 12. Warning Systems <ul><li>Warnings are issued by the Environmental Agency (in the UK) so that local people can put sandbags by their homes, take furniture upstairs or evacuate the area. </li></ul>
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