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What are the causes and consquences of flooding?

What are the causes and consquences of flooding?. What are the causes of floods?. What is a flood? When do rivers flood? What factors cause flooding? Flooding in Boscastle case study What were the causes of the Boscastle flood?

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What are the causes and consquences of flooding?

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  1. What are the causes and consquences of flooding?

  2. What are the causes of floods? • What is a flood? • When do rivers flood? • What factors cause flooding? • Flooding in Boscastle case study • What were the causes of the Boscastle flood? • Homework: what were the consequences of the Boscastle flood? 2004

  3. Boscastle Flood 2004: Flood factors • Higher than average rainfall, more rain in one day than normally falls in a month • Human activity: tarmac’d car park increased surface runoff • Relief: steep sided valley • Pre-existing conditions: ground saturated by previous rainfall • Drainage density: small drainage basin, two rivers (Valency and Jordan) converge, narrow drainage basin, rivers meet in centre of village • High tide: prevented water leaving the rivers • Soil type: prob. Porous as saturated and collapsed - landslide

  4. Where will it flood? • Are areas flood prone? • Environment Agency flood map • Rates an area’s risk to flooding • Includes areas that are defended

  5. Impacts of flooding • Remember the risk equation? Risk = hazard exposure + vulnerability - management

  6. Why do the impacts of flooding differ? • Contrast the impacts of flooding in the UK [Severn and Thames] and SE Asia [Ganges] August 2007

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