Pick a Number to Reveal the Picture

1. Pick a Number to Reveal the Picture!

7. STEEP SLOPES A drainage basin with steep slopes will result in any precipitation rapidly entering the river channel This will result in the peak flow (discharge) of the river being high and responsive in that it will reach peak discharge quickly and then fall away quickly once the rainfall event has ended

8. GEOLOGY The chalk (above) is permeable and as a result water is absorbed by the rock rather than allowing it to flow overland into the river channel

9. Vegetation Vegetation can influence river flooding If a drainage basin has woodland like in the top picture, then more of the rainfall will be intercepted and subsequently lost due to evavoptranspiration If little vegetation is present, more water will enter the river and promote a higher peak discharge

10. Some areas have a high number of streams draining the land, whereas other have very few. These differences in drainage density will result in differences in the speed in which water is transferred and therefore the potential flood risk

11. Cloud types and rainfall

13. Urbanisation � Human Influence on flooding On the previous slide, there was a picture of an urban landscape. What influence could this have on flooding? Rapid transfer of water through the drainage and sewer systems The concrete surfaces do not allow water to absorb into the ground But so what? Should we care?

14. Flooding: Should I be bothered?! Flooding has always been a problem for many places and recent high profile flooding events has raised our awareness. Do you remember News footage of Boscastle in 2004 or perhaps Bangladesh in the same year? Boscastle flood footage More recently, British settlements have suffered from flooding and people have been left homeless whilst their homes have been allowed to dry out and be repaired This has meant that people have had to start paying higher prices for their house insurance, but how is this price calculated? Flood maps have been created by the Environment Agency and anyone can now see if they live in a flood risk zone

15. Are you at risk of being flooded? Tasks to complete Are you at risk? Lets have a look at the school first by using the website http://www.environment-agency.gov.uk/subjects/flood/ and by typing in the school postcode Now have a look for yourself and find your own house. Paste your map into a word document and label where your house is and annotate with information on what the flood risk is (your house should be in the middle of the map generated)

16. The House Price Mystery On the following slide you will see four pictures of houses and we are going to work out the prices of them Before we do this, decide which would be your favourite house and why?

17. Higher or Lower?

18. Environment Agency Flood Risk Maps Did you get them correct? However, some key questions? Which of the house prices surprised you? Why has the final house been refurbished twice in the last 5 years? Why is the attractive harbour side house cheaper than the 4 bedroom house found in a �normal� village? Can we use the flood risk maps to help solve this mystery? Use the weblink http://www.environment-agency.gov.uk/subjects/flood Type the postcodes in for each of the four houses (PO20 2HW, PL35 0HA, PO4 9PS & CA1 2DD) and their location will be exactly in the middle of the flood map Paste the maps into a word document and suggest reasons for the differences in house price For two of the houses, you might want to find out further information about flood events that have occurred recently- these could form the basis of a detailed case study