REVISION AS CAMBRIDGE GEOGRAPHY: RIVERS - STORM HYDROGRAPHS.

1. AS GEOGRAPHY
HYDROLOGY
4 QUESTIONS
REVISION
STORM
HYDROGRAPH

2. QUESTION 1
Which factors influence the shape of a storm hydrograph?

3. ANSWER
Factors such as relief, urbanisation and vegetation cover affect the
passage of water through a drainage basin.

4. QUESTION 2
What is the lag time?

5. ANSWER
The time difference between the point of maximum input (precipitation)
and the point of maximum output (peak discharge).

6. QUESTION 3
Why is the rising limb often quite steep?

7. ANSWER
Because surface runoff (overland flow) tranfers precipitation quickly
into the river channel.

8. QUESTION 4
Why is the falling (recession) limb usually less steep than the rising limb?

9. ANSWER
Because it is largely made up of underground movements of water, such
as throughflow and base flow, which are slow and gradual.