Question 1

What are causes of dam failure? What determines the hazard potential of dam failure for people living downstream?

Accepted Answer

Dams can fail for a variety of reasons,i

Question 2

What physical effect do most bridges have on the streams they cross?

Accepted Answer

A)  They restrict flood flow on the floodplain, so water under the bridge is deeper and faster. 
B)  They minimize flooding upstream because the water upstream moves more slowly. 
C)  They decrease erosion under the bridge because they slow the water. 
D)  They decrease water level just downstream because the water there moves more slowly. 
E)  They cause vehicles crossing the bridge to get swept up in the flood. 
A)  They restrict flood flow on the floodplain, so water under the bridge is deeper and faster. 
B)  They minimize flooding upstream because the water upstream moves more slowly. 
C)  They decrease erosion under the bridge because they slow the water. 
D)  They decrease water level just downstream because the water there moves more slowly. 
E)  They cause vehicles crossing the bridge to get swept up in the flood.

Question 3

Where do people most commonly get the material to build an artificial river levee?

Accepted Answer

From the r

Question 4

Which of the following does NOT cause increased erosion in a stream channel?

Accepted Answer

A)  building a dam across the stream 
B)  mining gravel from the stream channel 
C)  planting native trees in the flood fringe 
D)  building a bridge across the stream, with roadway fill across the floodplain 
E)  channelizing the stream upstream 
A)  building a dam across the stream 
B)  mining gravel from the stream channel 
C)  planting native trees in the flood fringe 
D)  building a bridge across the stream, with roadway fill across the floodplain 
E)  channelizing the stream upstream

Question 5

Why does a stream typically erode its channel downstream from a newly constructed dam?

Accepted Answer

It no longer transpo

Question 6

How long before a flood can someone purchase insurance from the National Flood Insurance program?

Accepted Answer

A)  one week 
B)  30 days 
C)  3 months 
D)  6 months 
E)  1 year 
A)  one week 
B)  30 days 
C)  3 months 
D)  6 months 
E)  1 year

Question 7

What is the significance of a sand boil?

Accepted Answer

A)  formation of a boiling spring in a sand layer 
B)  a bulbous mass of sand at the toe of an active landslide 
C)  a sign of seepage under a river levee 
D)  sand and water that sprays up from the ground because of loading the ground by a nearby landslide 
E)  sand and water that bubbles up from an artesian well 
A)  formation of a boiling spring in a sand layer 
B)  a bulbous mass of sand at the toe of an active landslide 
C)  a sign of seepage under a river levee 
D)  sand and water that sprays up from the ground because of loading the ground by a nearby landslide 
E)  sand and water that bubbles up from an artesian well

Question 8

What pattern exists in the annual cost of U.S.flood damages from 1910 to 2010?

Accepted Answer

A)  an increase due to population increases and floodplain development 
B)  an increase due to a decline in building codes 
C)  a decrease due to restrictions on floodplain development 
D)  a decrease due to greenways, park systems, golf courses and ball parks 
E)  no increase or decrease due to subsidized flood insurance 
A)  an increase due to population increases and floodplain development 
B)  an increase due to a decline in building codes 
C)  a decrease due to restrictions on floodplain development 
D)  a decrease due to greenways, park systems, golf courses and ball parks 
E)  no increase or decrease due to subsidized flood insurance

Question 9

Why is it almost impossible to keep water from seeping under a levee and out onto a floodplain?

Accepted Answer

Before building the levee,the

Question 10

Where do people most commonly get the material to build an artificial river levee?

Accepted Answer

A)  from quarries in the nearby hills 
B)  from the local sand and gravel company 
C)  from the river channel, by dredging 
D)  from coastal dunes or beaches 
E)  old composted landfill material 
A)  from quarries in the nearby hills 
B)  from the local sand and gravel company 
C)  from the river channel, by dredging 
D)  from coastal dunes or beaches 
E)  old composted landfill material

Question 11

What are human activities that can impact stream processes and contribute to flooding? What happens to the streambed as a result of these activities? Identify and explain each activity and the ways in which it affects flooding.

Accepted Answer

Deforestation by fire,heavy logging,or o

Question 12

What is avulsion?

Accepted Answer

An event in which a stream lea

Question 13

Why does removal of vegetation cause more surface runoff and thus more erosion?

Accepted Answer

A)  It permits more water to directly strike the ground and run off. 
B)  All of the plants covering the surface slow the runoff. 
C)  Roots of the plants hold the soil together and prevent erosion. 
D)  It reduces the amount of vegetation available for forest fires. 
E)  It results in increased grazing and compaction of the soil. 
A)  It permits more water to directly strike the ground and run off. 
B)  All of the plants covering the surface slow the runoff. 
C)  Roots of the plants hold the soil together and prevent erosion. 
D)  It reduces the amount of vegetation available for forest fires. 
E)  It results in increased grazing and compaction of the soil.

Question 14

Why are artificial levees so easily eroded and fail so often?

Accepted Answer

The material used to

Question 15

A levee breach forms when a levee fails or is overtopped during flood.Why doesn't flow through the breach lead to avulsion or permanent change in the path of the main channel of a river such as the Mississippi?

Accepted Answer

Sediment carried through the breach depo

What are causes of dam failure? What determines the hazard potential of dam failure for people living downstream?

What physical effect do most bridges have on the streams they cross?

Where do people most commonly get the material to build an artificial river levee?

Which of the following does NOT cause increased erosion in a stream channel?

Why does a stream typically erode its channel downstream from a newly constructed dam?

How long before a flood can someone purchase insurance from the National Flood Insurance program?

What is the significance of a sand boil?

What pattern exists in the annual cost of U.S.flood damages from 1910 to 2010?

Why is it almost impossible to keep water from seeping under a levee and out onto a floodplain?

Where do people most commonly get the material to build an artificial river levee?

What are human activities that can impact stream processes and contribute to flooding? What happens to the streambed as a result of these activities? Identify and explain each activity and the ways in which it affects flooding.

What is avulsion?

Why does removal of vegetation cause more surface runoff and thus more erosion?

Why are artificial levees so easily eroded and fail so often?

A levee breach forms when a levee fails or is overtopped during flood.Why doesn't flow through the breach lead to avulsion or permanent change in the path of the main channel of a river such as the Mississippi?

Natural Hazards and Disasters

Plate Tectonics and Physical Hazards

Earthquakes and Their Causes

Earthquake Prediction 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

Streams And Flood Processes

Waves,Beaches,And Coastal Erosion

Hurricanes and Nor’easters

Wildfires

Impact of Asteroids and Comets

The Future: Where Do We Go From Here?

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Exam 13: Floods And Human Interactions

What are causes of dam failure? What determines the hazard potential of dam failure for people living downstream?

What physical effect do most bridges have on the streams they cross?

Where do people most commonly get the material to build an artificial river levee?

Which of the following does NOT cause increased erosion in a stream channel?

Why does a stream typically erode its channel downstream from a newly constructed dam?

How long before a flood can someone purchase insurance from the National Flood Insurance program?

What is the significance of a sand boil?

What pattern exists in the annual cost of U.S.flood damages from 1910 to 2010?

Why is it almost impossible to keep water from seeping under a levee and out onto a floodplain?

Where do people most commonly get the material to build an artificial river levee?

What are human activities that can impact stream processes and contribute to flooding? What happens to the streambed as a result of these activities? Identify and explain each activity and the ways in which it affects flooding.

What is avulsion?

Why does removal of vegetation cause more surface runoff and thus more erosion?

Why are artificial levees so easily eroded and fail so often?

A levee breach forms when a levee fails or is overtopped during flood.Why doesn't flow through the breach lead to avulsion or permanent change in the path of the main channel of a river such as the Mississippi?

Natural Hazards and Disasters

Plate Tectonics and Physical Hazards

Earthquakes and Their Causes

Earthquake Prediction 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

Streams And Flood Processes

Waves,Beaches,And Coastal Erosion

Hurricanes and Nor’easters

Wildfires

Impact of Asteroids and Comets

The Future: Where Do We Go From Here?

Filters