Question 1

How does failure of an artificial levee differ from failure of a natural levee?

Accepted Answer

A) The water spills slowly over the levee into its floodplain, dropping coarser particles next to the main channel. 
B) The water flows faster, and the areas next to the levee are commonly buried under sand and gravel. 
C) The water flows slowly, depositing valuable topsoil in the floodplain. 
D) The water flows at the same speed as the river, limiting erosion. 
E) There is no difference between failure of an artificial and a natural levee. 
A) The water spills slowly over the levee into its floodplain, dropping coarser particles next to the main channel. 
B) The water flows faster, and the areas next to the levee are commonly buried under sand and gravel. 
C) The water flows slowly, depositing valuable topsoil in the floodplain. 
D) The water flows at the same speed as the river, limiting erosion. 
E) There is no difference between failure of an artificial and a natural levee.

Question 2

The national flood insurance program formally separates the flood plain into the floodway and the _______________.

Accepted Answer

The answer of The national flood insurance program formally separates...

Question 3

Which type of dam is built to control downstream flooding?

Accepted Answer

A) flood-control dam 
B) wing dam 
C) hydroelectric dam 
D) spillway dam 
E) all types of dams 
A) flood-control dam 
B) wing dam 
C) hydroelectric dam 
D) spillway dam 
E) all types of dams

Question 4

What is/are the best material(s) for building a levee?

Accepted Answer

A) locally available material from the floodplain 
B) sand and mud 
C) coarse gravel 
D) clay 
E) crushed rock 
A) locally available material from the floodplain 
B) sand and mud 
C) coarse gravel 
D) clay 
E) crushed rock

Question 5

What is NOT a reason that a levee originally built to contain a 100-yr flood would be insufficient?

Accepted Answer

A) Major floods occur more frequently as areas are developed. 
B) Floods larger than a 100-year flood can occur at any time. 
C) Flood levels generally rise over time. 
D) Sediment deposited by tributary streams degrades the levee. 
E) Levees are of varying quality. 
A) Major floods occur more frequently as areas are developed. 
B) Floods larger than a 100-year flood can occur at any time. 
C) Flood levels generally rise over time. 
D) Sediment deposited by tributary streams degrades the levee. 
E) Levees are of varying quality.

Question 6

Describe coastal effects of removing sediments from a stream, as is done during mining.

Accepted Answer

Removal of sediments from a stream often

Question 7

How does a bridge promote erosion in a channel?

Accepted Answer

A) The bridge pilings interfere with the water flow, causing additional sediments to be deposited. 
B) The water velocity decreases, due to restricted flow over the floodplain. 
C) The water velocity increases, due to restricted flow over the floodplain. 
D) The channel height decreases, and large particles fall out, creating more surfaces for erosion to occur. 
E) A bridge does not promote erosion. 
A) The bridge pilings interfere with the water flow, causing additional sediments to be deposited. 
B) The water velocity decreases, due to restricted flow over the floodplain. 
C) The water velocity increases, due to restricted flow over the floodplain. 
D) The channel height decreases, and large particles fall out, creating more surfaces for erosion to occur. 
E) A bridge does not promote erosion.

Question 8

Where likely sources of debris flows are a short distance upstream and the channel gradient is high, ____.

Accepted Answer

A) a trip wire is more effective than an acoustic flow meter for debris flow warnings 
B) sirens should not be used in debris early warning systems 
C) warning time for a debris flow may be too short to allow for evacuation 
D) the danger to humans from a debris flow is minimized 
E) debris flows and mudflows will never be covered by flood insurance 
A) a trip wire is more effective than an acoustic flow meter for debris flow warnings 
B) sirens should not be used in debris early warning systems 
C) warning time for a debris flow may be too short to allow for evacuation 
D) the danger to humans from a debris flow is minimized 
E) debris flows and mudflows will never be covered by flood insurance

Question 9

Why would building a levee from locally-available material make it susceptible to failure?

Accepted Answer

The floodplain materials on which levees

Question 10

Dams cause erosion of the upstream channel.

Accepted Answer

A) True 
 B)False

How does failure of an artificial levee differ from failure of a natural levee?

The national flood insurance program formally separates the flood plain into the floodway and the _______________.

Which type of dam is built to control downstream flooding?

What is/are the best material(s) for building a levee?

What is NOT a reason that a levee originally built to contain a 100-yr flood would be insufficient?

Describe coastal effects of removing sediments from a stream, as is done during mining.

How does a bridge promote erosion in a channel?

Where likely sources of debris flows are a short distance upstream and the channel gradient is high, ____.

Why would building a levee from locally-available material make it susceptible to failure?

Dams cause erosion of the upstream channel.

Natural Hazards and Disasters

Plate Tectonics and Physical Hazards

Earthquakes and Their Causes

Earthquake Predictions Forecasts and Mitigation

Tsunami

Volcanoes Tectonic Environments and Eruptions

Volcanoes Hazards and Mitigation

Landslides and Other Downslope Movements

Sinkholes Land Subsidence and Swelling Soils

Weather Thunderstorms and Tornadoes

Climate Change Processes and History

Climate Change Impacts and Mitigation

Streams and Flood Processes

Waves Beaches and Coastal Erosion

Hurricanes and nor Easters

Wildfires

Asteroid and Comet Impacts

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Exam 14: Floods and Human Interactions

How does failure of an artificial levee differ from failure of a natural levee?

The national flood insurance program formally separates the flood plain into the floodway and the _______________.

Which type of dam is built to control downstream flooding?

What is/are the best material(s) for building a levee?

What is NOT a reason that a levee originally built to contain a 100-yr flood would be insufficient?

Describe coastal effects of removing sediments from a stream, as is done during mining.

How does a bridge promote erosion in a channel?

Where likely sources of debris flows are a short distance upstream and the channel gradient is high, ____.

Why would building a levee from locally-available material make it susceptible to failure?

Dams cause erosion of the upstream channel.

Natural Hazards and Disasters

Plate Tectonics and Physical Hazards

Earthquakes and Their Causes

Earthquake Predictions Forecasts and Mitigation

Tsunami

Volcanoes Tectonic Environments and Eruptions

Volcanoes Hazards and Mitigation

Landslides and Other Downslope Movements

Sinkholes Land Subsidence and Swelling Soils

Weather Thunderstorms and Tornadoes

Climate Change Processes and History

Climate Change Impacts and Mitigation

Streams and Flood Processes

Waves Beaches and Coastal Erosion

Hurricanes and nor Easters

Wildfires

Asteroid and Comet Impacts

Filters