Question 1

Choose the best answer. Which would increase during a flood, discharge or velocity?

Accepted Answer

A)   Discharge only because there is more water flowing
B)   Velocity only because the water is flowing faster
C)   Neither discharge or velocity because the stream will be doing more erosion during a flood
D)   Neither discharge or velocity because both are constant for any given stream
E)   Both discharge and velocity will increase because there is more water flowing and it is flowing faster.F) B) and C)
G) All of the above

Question 2

What is the greatest hazard to people in a flash flood?

Accepted Answer

A)   Sediment deposits
B)   Erosion of farmland
C)   People driving into floods and being carried away
D)   Houses and other buildings being carried away
E)   FiresF) A) and B)
G) D) and E)

Question 3

Where does a meandering river run the fastest?

Accepted Answer

A)   On the outside of a bend
B)   On the inside of a bend
C)   All parts of a meandering river run at similar speeds.
D)   Near the point barsE) A) and B)
F) A) and D)

Question 4

Imagine that you were put in charge of planning a public awareness campaign about flooding. What are some of the most important things that you would want people to know? Why are these important?

Accepted Answer

People should know basic information abo...

Question 5

There are some places that have too high a flood risk for people to rebuild; these homes usually are better off abandoned.

Accepted Answer

A) True 
 B)False

Question 6

If you dip a glass of water into a river and passed the water through a very fine sieve that blocked all sediment grains from passing through, what will you be left with?

Accepted Answer

A)   Bed load
B)   Suspended load
C)   Dissolved load
D)   Structural loadE) B) and D)
F) All of the above

Question 7

Virtually all areas of the U.S. have some risk of flooding.

Accepted Answer

A) True 
 B)False

Question 8

Paving over land decreases the amount of flooding because water can't soak into the soil.

Accepted Answer

A) True 
 B)False

Question 9

How would the hydrograph of a large rainstorm change after urbanization of an area?

Accepted Answer

A)   The hydrograph would become a straight line.
B)   The peak of the hydrograph would become lower and wider.
C)   The peak of the hydrograph would become higher and wider.
D)   The peak of the hydrograph would become higher and narrower.
E)   The peak of the hydrograph would become lower and narrower.F) B) and E)
G) C) and E)

Question 10

A narrow river usually runs faster than a wider one.

Accepted Answer

A) True 
 B)False

Question 11

One of the benefits of flooding is deposition of fertile soil.

Accepted Answer

A) True 
 B)False

Question 12

Give an example of something that acts as a base level for streams. Explain what happens to the river as it reaches this level and why it is a base level. Sketch a longitudinal profile for this stream.

Accepted Answer

The base level of a river is the lowest ...

Question 13

In which of the following environments are flash floods LEAST common?

Accepted Answer

A)   Higher elevations in a small drainage basin
B)   Arid environments with steep slopes
C)   Humid environments with large meandering rivers
D)   Urban environments with poor drainageE) B) and D)
F) A) and C)

Question 14

How does urbanization affect flooding?

Accepted Answer

Urbanization increases both the magnitud...

Question 15

During a flood, the safest place to be is behind a levee or floodwall.

Accepted Answer

A) True 
 B)False

Question 16

Does channelization of a stream completely prevent flooding?

Accepted Answer

A)   No. Nothing can prevent flooding,
B)   No. It increases flooding.
C)   Yes. It is the best solution for flooding and it has no drawbacks.
D)   Yes. However, it is not necessarily good for habitats.
E)   No one actually knows because channelization of a stream has never been applied to the real world.F) A) and B)
G) C) and D)

Question 17

What happens to rivers when they reach their base level?

Accepted Answer

A)   Their discharge decreases.
B)   They erode sediment.
C)   They fill the bottom of a v-shaped valley.
D)   They often form alluvial fans or deltas.E) A) and B)
F) B) and D)

Question 18

Which statement is FALSE  about the effects that floods can have?

Accepted Answer

A)   Floods can supply nutrients to soils for farming.
B)   Floods can clear ecosystems of debris.
C)   Floods can supply sediments to build up the elevation of land.
D)   Floods can bring nutrients to ecosystems.
E)   Flooding has no positive effects; it is always bad for human interests.F) A) and B)
G) All of the above

Question 19

In which of the following cases would you expect the LEAST amount of flooding due to a rainstorm? Assume all areas receive similar amounts of rainfall in the rainstorm and there are no flood control measures in any of the areas.

Accepted Answer

A)   An area where soil is already saturated due to previous recent thunderstorms
B)   An area where the ground is frozen
C)   A short duration rainstorm falling on an area that is typically very dry such as a desert
D)   A city with many houses, paved roads, and sidewalks
E)   A long duration rainstorm falling on an area that consists of forest, grasslands, and no human development.F) B) and D)
G) D) and E)

Question 20

Which of the following loads would make a river appear murky or dirty?

Accepted Answer

A)   Bed load
B)   Suspended load
C)   Dissolved load
D)   Structural load
E)   Buoyant loadF) All of the above
G) D) and E)

Exam 6: Flooding

During a flood, the safest place to be is behind a levee or floodwall.

Correct AnswerverifiedShow Answer

Which statement is FALSE about the effects that floods can have?

Correct AnswerverifiedShow Answer

Imagine that you were put in charge of planning a public awareness campaign about flooding. What are some of the most important things that you would want people to know? Why are these important?

Correct AnswerverifiedPeople should know basic information abo...View AnswerShow Answer

A narrow river usually runs faster than a wider one.

Correct AnswerverifiedShow Answer

In which of the following cases would you expect the LEAST amount of flooding due to a rainstorm? Assume all areas receive similar amounts of rainfall in the rainstorm and there are no flood control measures in any of the areas.

Correct AnswerverifiedShow Answer

One of the benefits of flooding is deposition of fertile soil.

Correct AnswerverifiedShow Answer

How does urbanization affect flooding?

Correct AnswerverifiedUrbanization increases both the magnitud...View AnswerShow Answer

There are some places that have too high a flood risk for people to rebuild; these homes usually are better off abandoned.

Correct AnswerverifiedShow Answer

How would the hydrograph of a large rainstorm change after urbanization of an area?

Correct AnswerverifiedShow Answer

What is the greatest hazard to people in a flash flood?

Correct AnswerverifiedShow Answer

Where does a meandering river run the fastest?

Correct AnswerverifiedShow Answer

Virtually all areas of the U.S. have some risk of flooding.

Correct AnswerverifiedShow Answer

If you dip a glass of water into a river and passed the water through a very fine sieve that blocked all sediment grains from passing through, what will you be left with?

Correct AnswerverifiedShow Answer

In which of the following environments are flash floods LEAST common?

Correct AnswerverifiedShow Answer

Does channelization of a stream completely prevent flooding?

Correct AnswerverifiedShow Answer

Choose the best answer. Which would increase during a flood, discharge or velocity?

Correct AnswerverifiedShow Answer

Give an example of something that acts as a base level for streams. Explain what happens to the river as it reaches this level and why it is a base level. Sketch a longitudinal profile for this stream.

Correct AnswerverifiedThe base level of a river is the lowest ...View AnswerShow Answer

Which of the following loads would make a river appear murky or dirty?

Correct AnswerverifiedShow Answer

Paving over land decreases the amount of flooding because water can't soak into the soil.

Correct AnswerverifiedShow Answer

What happens to rivers when they reach their base level?

Correct AnswerverifiedShow Answer

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People should know basic information abo...
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Correct Answer
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Urbanization increases both the magnitud...
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The base level of a river is the lowest ...
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