river flooding page 24

What was the record rainfall measured at Seathwaite in the Lake District on 19 November 2009?

• 150.3 mm in 12 hours

• 400 mm in 24 hours

• 200 mm in 24 hours

• 314.4 mm in 24 hours

What is the main cause of river floods?

• Melting snow

• Long period of rainfall

• Sudden increase in temperature

• High tide

What type of flood is caused by torrential storms?

• River flood

• Coastal flood

• Flash flood

• Urban flood

Which rock type contributes to increased flooding risk?

• Sandstone

• Limestone

• Granite

• Shales and clays

How does urbanisation increase flood risk?

• By creating more green spaces

• By reducing water usage

• By increasing permeable surfaces

• By creating impermeable surfaces

What effect does deforestation have on flooding?

• Decreases water transfer to rivers

• Increases evaporation

• Increases water transfer to rivers

• Has no effect on flooding

How does agriculture contribute to flooding?

• By increasing surface runoff

• By planting more trees

• By reducing surface runoff

• By increasing water storage in soil