| (a) |
Print
out the diagram and label the following: |
|
(i)
|
peak
flow |
(1)
|
|
(ii) |
lag
time |
(1)
|
|
(iii) |
falling
limb |
(1)
|
|
|
|
|
| (b) |
What
was the rainfall |
|
(i)
|
in
the hour when the rainfall was heaviest? |
(1)
|
|
(ii) |
during
the whole storm? |
(1)
|
|
|
|
|
| (c) |
State
whether a flood would be more or less likely in this basin if each
of the following happened. Explain each of your answers: |
| |
(i)
|
the
valley sides were steeper |
(3)
|
| |
(ii) |
the
rock was more permeable |
(3)
|
| |
(iii)
|
deforestation
occurred |
(3)
|
| |
(iv) |
there
was a period of heavy rainfall just before the storm shown on the
hydrograph
|
(3)
|
| |
(v) |
the
farmer's drains in the soil became blocked so that the fields became
waterlogged |
(3)
|