Factors affecting flood risk and hydrographs

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Factors affecting flood risk and hydrographs

True or false? A flood occurs when water can no longer be contained within a river channel. The risk of flood can be increased by human and physical factors.

True

False

Correct! Wrong!

Which of the following is not a physical factor that can increase the risk of flooding?

Impermeable rock resulting in rapid overland flow.

Heavy or prolonged rainfall saturating the soil.

Bare soils caused by farming can transfer water quickly especially when they are saturated in winter.

Correct! Wrong!

Which of the following is not a human factor that can increase the risk of flooding?

Water travels faster over steep slopes in mountainous areas leading to greater flood risk.

Deforestation leads to land no longer being protected from rainfall increasing the transfer of water into river channels.

Urbanisation leads to water being transferred rapidly over impermeable concrete.

Correct! Wrong!

What is a hydrograph?

A hydrograph illustrates river discharge and rainfall over time.

A hydrograph illustrates river capacity and rainfall over time.

A hydrograph illustrates river discharge and overland flow over time.

Correct! Wrong!

Which of the following hydrographs is most likely to result in flooding?

Correct! Wrong!

The normal day to day discharge of the river and is the consequence of groundwater seeping into the river channel is known as what?

Base flow

Peak flow

Storm flow

Correct! Wrong!

An area with a hydrograph that is described as being 'flashy' is most likely to what?

Not experience flooding

Flood

Correct! Wrong!

What is bankfull discharge?

The maximum discharge that a particular river channel is capable of carrying without flooding.

When the capacity of a river to transport water is exceeded and water flows over it’s banks.

The point on a flood hydrograph when river discharge is at its greatest.

Correct! Wrong!

True or false? Deforestation can lead to flooding.

True

False

Correct! Wrong!

What is the period of time between the peak rainfall and peak discharge on a hydrograph?

Peak discharge

Lag time

Storm flow

Correct! Wrong!

Factors affecting flood risk and hydrographs

Well done! You have a good understanding of this area of geography.

Good try, you could do with revising this area a bit more though.

Oh dear, you definitely need to work on this area.

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Factors affecting flood risk and hydrographs