Hydro cycel adn graphs ap

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Hydro cycel adn graphs ap

  1. 1. Lesson Aims: 1. To understand how the river basin hydrological cycle works. 2. To understand the factors that effect the amount of water in the river
  2. 2. Water Flows • Impermeable – water can’t permeate through it (e.g. tramac, etc.) • Permeable – water can permeate through it (e.g. soil)
  3. 3. Drainage basin hydrological cycle (p108) INPUTS OUTPUTSPROCESSESSTORES
  4. 4. How does all this water get into the rivers?
  5. 5. How does all this water get into the rivers? • On the mini white board draw a drainage basin with a main river and tributary. • Then add ‘real rain’ and show how it moves down the rivers. • What will make the ‘rain’ flow faster into the main rivers?
  6. 6. EXPERIEMENT TIME! How could we collect rainfall data during a storm?
  7. 7. EXPERIEMENT TIME! How could we collect data from a river during a storm?
  8. 8. Hydrographs • These are graphs that show the amount of rainfall and the volume of water discharged during a storm by a river. • Label your diagram
  9. 9. 0 12 24 36 48 30 72 Hours from start of rain storm 3 2 1 Discharge(m3/s)
  10. 10. 0 12 24 36 48 30 72 Hours from start of rain storm 3 2 1 Discharge(m3/s) mm 4 3 2 Rainfall shown in mm, as a bar graph
  11. 11. 0 12 24 36 48 30 72 Hours from start of rain storm 3 2 1 Discharge(m3/s) mm 4 3 2 Discharge in m3/s, as a line graph
  12. 12. 0 12 24 36 48 30 72 Hours from start of rain storm 3 2 1 Discharge(m3/s) mm 4 3 2 The rising flood water in the river
  13. 13. 0 12 24 36 48 30 72 Hours from start of rain storm 3 2 1 Discharge(m3/s) mm 4 3 2 Peak flow Peak flow Maximum discharge in the river
  14. 14. 0 12 24 36 48 30 72 Hours from start of rain storm 3 2 1 Discharge(m3/s) mm 4 3 2 Peak flow Falling flood water in the river
  15. 15. 0 12 24 36 48 30 72 Hours from start of rain storm 3 2 1 Discharge(m3/s) Basin lag time mm 4 3 2 Peak flow Basin lag time Time difference between the peak of the rain storm and the peak flow of the river
  16. 16. 0 12 24 36 48 30 72 Hours from start of rain storm 3 2 1 Discharge(m3/s) Base flow Basin lag time mm 4 3 2 Peak flow Base flow Normal discharge of the river
  17. 17. 0 12 24 36 48 30 72 Hours from start of rain storm 3 2 1 Discharge(m3/s) Base flow Through flow Overland flow Basin lag time mm 4 3 2 Peak flow Overland flow Through flow + = Storm Flow
  18. 18. What factors effect the discharge (volume) of water in any river?
  19. 19. What factors would influence the flood hydrograph in this area?
  20. 20. What factors would influence the flood hydrograph in this area?
  21. 21. What factors would influence the flood hydrograph in this area?
  22. 22. What factors would influence the flood hydrograph in this area?

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