A drainage basin is defined as the area of land drained by a river and its tributaries. Static factors that influence water movement through a basin and do not change over time include rock type, relief, soil type, shape and size of the basin, and drainage density. Dynamic factors that influence water movement through a basin and do vary over time include climate, vegetation, human activities, and previous conditions. All of the factors mentioned influence the amount of water stored in the basin and the rate at which water is transferred between stores.

1. AS GEOGRAPHY
HYDROLOGY
4 QUESTIONS
REVISION
DRAINAGE
BASIN

2. DEFINITION
A drainage basin is the area of land drained by a river and its
tributaries.

3. QUESTION 1
What are static factors?

4. ANSWER
Factors that influence the movement of water through a basin and that
do not change over time.

5. QUESTION 2
Give three examples of static factors.

6. ANSWER
Rock type, relief, soil type, shape and size of the basin, drainage density.

7. QUESTION 3
What are the dynamic factors?

8. ANSWER
Factors that influence the movement of water through a basin and that
do vary over time.

9. QUESTION 4
Give three examples of dynamic factors.

10. ANSWER
Climate, vegetation, density, human activities, previous conditions.

11. IMPORTANT
All of the factors mentioned in this presentation influence the amount of
water stored in the basin and the rate at which water is transferred
between the stores.
This is a fundamentally important set of factors that students should be
able to apply to other hydrological topics such as river regimes and
storm hydrographs.