Resources 2 and 3

1. Resources 2 and 3

2. Learning Objectives • Understand terminology. • Classify flood events by probability and impact. • Compare two drainage basins identifying the factors that affect the probability and impact of flooding. • Justify why the drainage basin have different probabilities and impacts of flooding.

3. Resource 2 Impacts of Flooding

5. Probability means the likelihood of something happening. (E.g. Low Probability = less likely to happen. High Probability =more likely to happen.) Impact means the effect(s) that something will have. (E.g. High impact = serious effects. Low impact = minor effects )

6. Match the likely scenarios with the impact and probability graph • River floods rarely in a rural area, the river is surrounded by fields and the sheep get wet feet. • Thames Barrier is broken by a storm surge which cause the river level to increase dramatically and London to flood up to Shepherds Bush. • The River floods frequently, the river is surrounded by woodland and is sparsely populated • The river floods frequently and residents often evacuated by the emergency services in life boats. • Okavango Delta which is landlocked inside Botswana (Southern Africa) the Okavango River annually floods to create an inland delta. Whilst animals rely on this to provide water for grass to grow, very few humans live there. • Boscastle is a small village on the North Coast of Cornwall which was flooded after a sudden thunderstorm in the summer of 2004. • If the River Avon at Bath were to flood it would only affect the river meadows at Batheaston, as there are flood-protection measures in place within the city • Bangladesh is the location for the confluence of 3 massive rivers, all draining the Himalayas. Annual snow melt, monsoon rains and cyclones all contribute to flooding.

7. Match the likely scenarios with the impact and probability graph • River floods rarely in a rural area, the river is surrounded by fields and the sheep get wet feet. Low Probability – Low Impact • Thames Barrier is broken by a storm surge which cause the river level to increase dramatically and London to flood up to Shepherds Bush. Low Probability – High Impact • The River floods frequently, the river is surrounded by woodland and is sparsely populated High Probability – Low Impact • The river floods frequently and residents often evacuated by the emergency services in life boats. High Probability – High Impact • Okavango Delta which is landlocked inside Botswana (Southern Africa) the Okavango River annually floods to create an inland delta. Whilst animals rely on this to provide water for grass to grow, very few humans live there. High Probability – Low Impact • Boscastle is a small village on the North Coast of Cornwall which was flooded after a sudden thunderstorm in the summer of 2004. Low Probability – High Impact • If the River Avon at Bath were to flood it would only affect the river meadows at Batheaston, as there are flood-protection measures in place within the city. Low Probability – Low Impact • Bangladesh is the location for the confluence of 3 massive rivers, all draining the Himalayas. Annual snow melt, monsoon rains and cyclones all contribute to flooding. High Probability – High Impact

8. Resource 3 Areas which could be affected by flooding

9. How would you classify these two areas in terms of flood probability and impact? Explain your choice. Area 1 Area 2

10. Annotate your diagram to show the features that are more likely to increase the flood risk and decrease the flood risk

11. Annotate your diagram to show the features that are more likely to increase the flood risk and decrease the flood risk

12. Using the information in resource 3 complete the table on your worksheet Area 1 Area 2

13. Extension • Complete the questions based on resource 2 and 3.

14. Homework • Compete the questions

15. Have we achieved our Learning Objectives? • Understand terminology. • Classify flood events by probability and impact. • Compare two drainage basins identifying the factors that affect the probability and impact of flooding. • Justify why the drainage basin have different probabilities and impacts of flooding.

16. To finish with…… • Why is it important for government to know the probability of a flood? • Why is it important for government to know the impact of a potential flood?