Factors affecting flooding year 11 gcse

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  • 1. River Topic: Factors affecting flooding and the shape of the storm hydrograph
  • 2. First……Water Cycle Recap
  • 3. 1. Label numbers 1-5 (easy!)
  • 4. 2. Label missing key words 1-5 FIVE TWO THREE FOUR ONE
  • 5. The Drainage Basin System … .what you should know!!
  • 6. Precipitation
  • 7. Precipitation Interception
  • 8. Precipitation Interception Leaf drip etc.
  • 9. Precipitation Interception Leaf drip etc. Surface Storage
  • 10. Precipitation Interception Leaf drip etc. Surface Storage Infiltration
  • 11. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage
  • 12. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation
  • 13. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation Groundwater
  • 14. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation Groundwater Deep Basin Outflow
  • 15. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation Groundwater Evaporation
  • 16. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation Groundwater Evaporation Transpiration Plant Storage
  • 17. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation Groundwater EvapoTranspiration Overland Flow
  • 18. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation Groundwater EvapoTranspiration Overland Flow Channel Storage
  • 19. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation Groundwater EvapoTranspiration Overland Flow Channel Storage Throughflow
  • 20. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation Groundwater EvapoTranspiration Overland Flow Channel Storage Throughflow Groundwater Flow
  • 21. Precipitation Interception Leaf drip etc. Surface Storage Infiltration Soil Storage Percolation Groundwater EvapoTranspiration Overland Flow Channel Storage Throughflow Groundwater Flow River Run Off
  • 22. River DISCHARGE
    • Discharge is the volume rate of water flow, which is transported through the river channel.
    • Measured in cumecs (cubic metres per second)
  • 23. DISCHARGE (cumecs) RAINFALL mm time LAG TIME Peak Rainfall Peak Discharge http://www.bbc.co.uk/scotland/education/int/geog/rivers/hydrographs/index.shtml
  • 24. The Flood Hydrograph – A = floods quickly (flash flood) B = slower rate of discharge, less likely to flood WHAT FACTORS AFFECT THE DISCHARGE LINE?
  • 25. So…how can we alter the drainage basin?
  • 26. Urbanisation - homes
  • 27. Urbanisation - Roads
  • 28. Drainage basin – shape and size
  • 29. Geology Which one might be permeable? Which one would slow down the passage of water the most? Which one would be most likely to flood?
  • 30. Deforestation – how would this affect movement of water through the system?
  • 31. Vegetation What processes are shown? How does vegetation affect infiltration? How does vegetation affect the speed of passage of water through the drainage basin? How does vegetation affect the hydrograph shape? A or B?
  • 32. URBANISATION – removing vegetation and increasing RUN OFF
  • 33. Industry Can also discharge water Effect on hydrograph? Effect on water quality? Effect on sediment?
  • 34. TASKS
    • Create a flood hydrograph from the data for River Thaw
    • http://www.ngfl-cymru.org.uk/vtc/ngfl/2007-08/geog/hydrology/Flood%20Hydrographs/Activity%203%20-%20Flood%20Hydrograph,%20River%20Thaw.html
    • Follow the link above to see what the graph should look like
    • Explain the shape of the graph – how is rainfall linked to discharge.
  • 35. Extra Links
    • http://www.geogonline.org.uk/as_drainage.htm
    • http://www.ngfl-cymru.org.uk/vtc/ngfl/2007-08/geog/hydrology/front_%20pages/index_floodhydrograph.html