The document provides rainfall and river discharge data over time and asks the student to draw a hydrograph based on the data. It also asks the student to compare two sample hydrographs labeled A and B to identify which has the largest lag time between rainfall and peak discharge. Finally, it prompts the student to consider factors that could cause a hydrograph to have two peaks, such as additional rainfall after an initial event.

1. What factors would influence the
flood hydrograph of a river flowing in
this area?

2. DRAW your own hydrograph!
TIME 1200 1230 1300 1330 1400 1430 1500 1530 1600 1630 1700 1730 1800 1830 1900 1930 1800
Rainfall 0 4 3 10 4 6 13 15 9 3 0 0 0 0 0 0 0
River discharge (cumecs) 1 1 2 2 6 10 20 50 52 55 90 98 100 90 55 22 10
Use the data above and on your sheet to draw an actual Hydrograph … you may
need to finish it for Homework!

4. Two different Hydrographs A & B –
can you describe them?

5. Hydrographs – on Showbie
Compare these two hydrographs.
Which one has the largest lag time? Explain your answer.

6. Have a go on your own
1. Read and complete 2. Write an explanation
the star diagrams as to how the different
factors affect discharge
How can
climate
change
affect
discharge?

7. Amount and type of precipitation

8. Temperature

9. Temperature

10. Temperature

11. Previous weather conditions

12. Relief

13. Relief

14. Rock Type

15. Land use

16. Land Use

17. Human Management

18. Human Management

19. Human Management

20. Hydrographs
What could cause 2 peaks in a
hydrograph?