What is a drainage basin?
The area of land drained by a river
Another word for the geographical term sink
The ridge of high land which surrounds a river
What is a watershed?
The boundary between one drainage basin and another
The deep pool at the base of a waterfall
The start of a river
The hydrological cycle is a closed system. What does this mean?
This means that there is a definite amount of water in the system, and that this amount does not change
This means that there is a varying amount of water in the system, and that this amount changes over time
This means that there is a varying amount of water in the system, as inputs change depending on geographic location
What is overland flow?
The movement of water through the soil
The total precipitation which flows over the surface of the basin
The storage of water on the surface
The final release of the water in a drainage basin is an output. Which of the options is an output?
Evapotranspiration
Precipitation
Infiltration
What does a hydrograph show?
Two graphs - a bar chart showing rainfall and a line graph showing discharge from before, during and after the rainstorm shown in the bar graph
The differences between two rivers over time
One graph - a line graph showing discharge from before, during and after the rainstorm
What is meant by the term 'lag time'?
This is the difference in time between the height of the storm and the highest flow of the river
The time over which the overland flow is measured
The difference between the amount of water in the river at the beginning and end of the storm
Which statement below is a physical cause of flooding in Boscastle?
People didn’t have sandbags
A huge tornado swept through the village
The ground was already saturated from heavy rain and could not hold any more water
Which of the following is a soft engineering method of flood protection?
Deforestation
Building dams
Afforestation
What groups of people may prefer hard engineering strategies over soft engineering strategies for reducing flood risk?
Environmentalists
Governments and developers
Local residents