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Managing flood risk
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What is a levee
High banks built on/near river banks
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What are places called when they flood often?
Flood zones
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What is the term for deepening and/or straightening the the river?
Channelisation
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A disadvantage of dams and reservoirs.
Expensive. Displaces people. Ruin the environment. Algae growth
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What is the name for an area of the flood plain that are allowed to flood and one disadvantage?
Term: Washland / Disad: Limits landuse e.g. farming
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What are the disadvantages of channelisation?
May put other places at risk/does not look natural
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What is a disadvantage of levees?
Expensive or unsightly and not often needed
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The term used for Governments allocating areas of land to different uses, according to their level of flood risk.
Flood Plain Zoning
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Flash floods
a sudden local flood, typically due to heavy rain
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Afforestation (planting trees) aids infiltration (absorption) through what process?
Interception
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An advantage of levees/embankments
Earth/grass-blends in with the environment or Prevents flooding of houses/land
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A disadvantage of levees
Burst/overflow and water becomes trapped causing even more damage
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Give 2 advantages of dams and reservoirs.
1. HEP (Hydroelectric Power) 2. Water Supply 3. Water Sports
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What is the term for extra channels built next to rivers or leading from them and an advantage?
Term: Flood Relief Channels / Adv: Prevents overflow by accommodating high flow
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An advantage of River restoration (restoring the river's original course)
Can slow rivers down preventing flooding downstream by removing levees & restoring meanders or more attractive or habitats for wild life.
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What is an advantage of washlands?
Safe place for floodwater preventing it from affecting valuable areas or improves the river's sedimentation process
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What is spillway?
A path for flood water
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Rapid on-set floods
They can be destructive, but not as much as flash floods
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What is the advantage of channelisation?
It allows the water to move quicker (away from places at risk)
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What is "floodplain"?
an area of flat land near a river that is often flooded when the river becomes too full
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What is another word for an embankment?
Levee
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What is an advantage flood plain zoning?
Aims to prevent the development of homes/businesses in high risk areas.
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What is the term for barriers that hold back water in an artificial lake?
Dam & Reservoir
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