Take the Floods Quiz

Test your knowledge with the floods quiz, 20 multiple choice questions on basic science and engineering concepts of floods, including flood causes and impacts, flood forecasts and warnings, flood management, and the impact of climate change and other factors on flooding in the future. To learn more, read the Understanding Floods: Questions and Answers report (PDF, 2.9MB).

1. A flash flood is a flood that:

  1. is caused by heavy rain rather than from the flooding of a river
  2. occurs in urban areas
  3. occurs suddenly and unexpectedly and for a short duration
  4. is caused by the blocking of drains.

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2. A flood can vary in:

  1. size
  2. speed of water flow
  3. duration
  4. all of the above.

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3. When a river’s water level reaches 10 metres, this means that:

  1. the water level is 10 metres above an arbitrary ‘zero’ level
  2. the water level is 10 metres above mean sea level
  3. the water level is 10 metres above mean sea level or an arbitrary 'zero' level
  4. it will flood.

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4. The size of a flood is measured by:

  1. the rate of flow of water in a waterway or river
  2. the level of water in a waterway or river
  3. a river gauging station
  4. all of the above.

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5. Which of the following is associated with a La Niña event?

  1. The Southern Oscillation Index (SOI) is strongly negative.
  2. The ocean surface off the coast of South America is warmer than usual.
  3. There is an increased chance of above average rainfall in eastern Australia.
  4. All of the above.

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6. Which of the following potentially affects the size of a flood?

  1. bridges and other structures in waterways
  2. the size and windiness of a river
  3. vegetation in and around a river
  4. all of the above.

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7. In Australia, the average annual cost of floods is around:

  1. $3.8 million
  2. $38 million
  3. $380 million
  4. $3.8 billion.

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8. In Australia, the most expensive natural disaster is:

  1. drought
  2. floods
  3. bushfires
  4. cyclones.

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9. Which of the following is an environmental consequence of floods?

  1. dispersal of weed species
  2. erosion of soil
  3. release of pollutants into waterways
  4. all of the above.

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10. Which of the following is used to estimate which areas will be inundated during a flood, based on river height information?

  1. satellite and radar images
  2. flood maps / floodplain hydraulic models
  3. river gauging stations
  4. all of the above.

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11. Which of the following statements is false?

  1. Weather forecasts for a small region are more accurate than those for a large region.
  2. Weather forecasts are more accurate in Melbourne than in Darwin.
  3. Forecasts of temperature are more accurate than forecasts of rainfall.
  4. All of the above.

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12. Which of the following is true? Flood warnings:

  1. should not be released until the information is certain
  2. should indicate what the threat is, what action should be taken, by whom and when
  3. are best if they come from a single source (for example, an internet website)
  4. all of the above.

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13. If you experienced a 1-in-100 year flood this year, what is the chance you will experience one next year?

  1. none
  2. 1 in 10,000 odds (0.01%)
  3. 1 in 1000 odds (0.1%)
  4. 1 in 100 odds (1%).

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14. If your house is in an area that will be flooded by a 1-in-100 year flood, then the chance that you will be flooded at least once within the next 70 years is:

  1. 1 in 2 odds (50%)
  2. 7-in-10 odds (70%)
  3. 1-in-70 odds (1.4%)
  4. 1-in-100 odds (1%).

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15. Flood risk refers to:

  1. the chance of a flood occurring
  2. the number of people and properties exposed to floodwaters if a flood occurs
  3. the vulnerability of people and properties that are exposed to floodwaters
  4. all of the above.

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16. Which of the following can reduce the risk of flooding?

  1. zonings and building regulations for new developments
  2. dams, detention basins and levees
  3. flood awareness and education programs
  4. all of the above.

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17. The Probable Maximum Flood is:

  1. an estimation of the largest possible flood that could occur at a particular location
  2. the maximum flood experienced in the last 100 years
  3. the maximum flood experienced in the last 200 years
  4. the maximum flood experienced since flood records have existed.

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18. For good land use planning, buildings should be built:

  1. above the 1-in-100 year flood level
  2. above the level of the Probable Maximum Flood
  3. based on the chance and consequences of a flood for that particular building
  4. above the level of the largest historical flood.

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19. In the future, which of the following is expected to increase the risk of flooding?

  1. population growth
  2. urbanisation
  3. climate change
  4. all of the above.

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20. In the future, which of the following is unlikely?

  1. There will be an increased chance of flash flooding and coastal inundation.
  2. Flood risk will increase due to population growth and urbanisation.
  3. Improvements in flood forecasting and warning technologies will reduce the impacts of floods.
  4. We will be able to eliminate the risk of flooding.

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