Geography_Theme 2_Rivers_6

True or False? Flooding leads to a decrease in erosion of the banks of rivers.

• True

• False

What is a flood hydrograph?

• A graph showing changes in river discharge after a storm event

• A graph showing the average rainfall over a year

• A graph showing the temperature changes in a river

• A graph showing the sediment load in a river

Define the term lag time.

• The time taken for a river to dry up after a flood

• The time taken for precipitation to reach the river from where it falls

• The time taken for a river to reach its peak discharge

• The time taken for a river to return to normal flow after a storm

True or False? Rivers with a long lag time have a higher flood risk.

• True

• False

What are the two main categories of flood management?

• Natural and artificial engineering

• Hard engineering and soft engineering

• Structural and non-structural engineering

• Urban and rural engineering

Define the term hard engineering.

• Building structures or changing the river channel to manage floods

• Planting trees to absorb excess water

• Educating the public about flood risks

• Monitoring weather patterns to predict floods

Which of the following is an example of hard engineering?

• Planting vegetation along riverbanks

• Building dams and reservoirs

• Implementing flood warning systems

• Creating floodplain zoning

Which of the following is NOT an example of hard engineering?

• Embankments or levées

• Straightened channels

• Flood relief channels

• Rainwater harvesting

What is the primary purpose of a flood relief channel?

• To increase the water temperature in a river

• To divert excess water away from populated areas

• To increase the sediment load in a river

• To reduce the biodiversity in a river

True or False? Soft engineering involves building large structures to control floods.

• True

• False