Flooding and Its Causes

What is flooding?

• When land that is normally underwater becomes dry

• When a river channel can no longer hold the amount of water flowing in it

• When a river dries up completely

• When a river changes its course

What is a common cause of river floods?

• Long periods of drought

• Long periods of rainfall

• Sudden temperature drops

• Earthquakes

What is the impact of agriculture on flood risk?

• It decreases flood risk by increasing soil absorption

• It increases flood risk by leaving soil exposed

• It has no impact on flood risk

• It decreases flood risk by reducing surface runoff

What is the role of precipitation in flooding?

• It decreases flood risk by reducing water flow

• It can lead to sudden flash floods

• It has no effect on flooding

• It only affects coastal areas

How does geology affect flood risk?

• Impermeable rocks increase flood risk

• Permeable rocks increase flood risk

• Rocks have no effect on flood risk

• Rocks decrease flood risk by absorbing water

What is the effect of impermeable surfaces on flood risk?

• They decrease flood risk by absorbing water

• They increase flood risk by preventing water absorption

• They have no effect on flood risk

• They decrease flood risk by increasing evaporation

How does a high drainage density affect water transfer?

• Slows down water transfer

• Speeds up water transfer

• Has no effect

• Stops water transfer

What land use encourages rapid water transfer?

• Urbanisation

• Forests

• Agriculture

• Desert

How do steep slopes affect water transfer?

• Slow down water transfer

• Lead to rapid water transfer

• Have no effect

• Stop water transfer

What happens to water transfer in saturated soil?

• Slows down

• Stops completely

• Results in rapid overland flow

• Increases infiltration