Question 1

Saltation is a process by which streams dissolve soluble minerals and become saltier.

Accepted Answer

A) True 
 B)False

Question 2

A hydrograph is:

Accepted Answer

A)   A plot of stream stage or discharge versus time
B)   A map showing the extent of a floodplain
C)   A diagram that illustrates flood recurrence intervals
D)   A graph of variations in precipitation through time

Question 3

A cut bank is the outside bank of a meander that is subject to erosion.

Accepted Answer

A) True 
 B)False

Question 4

Stream-deposited sediments are often well sorted because the size of particles moved is a function of stream velocity,quantity of water,and discharge.

Accepted Answer

A) True 
 B)False

Question 5

Unlike streams,lakes do not flood because runoff does not drain into lakes.

Accepted Answer

A) True 
 B)False

Question 6

Once formed,meanders enlarge downward only,cutting deeper and deeper over time.

Accepted Answer

A) True 
 B)False

Question 7

A flash flood is a variety of upstream flood.

Accepted Answer

A) True 
 B)False

Question 8

The U.S.Geological Survey and the National Weather Service work together to

Accepted Answer

A)   Alert the public about impending flash flooding by using drainage basin characteristics (USGS)  and meteorological events (NWS)  to predict areas and timing where rapid water level rise may occur.
B)   Judge the amount of sedimentation that will fill a river channel in a year and thus help in flood forecasting.
C)   Keep public officials informed about the narrowing or widening of the 100-year floodplain in upstream drainage basins.
D)   Inform insurance companies that provide flood insurance to individuals about locations where flooding is most probable.

Question 9

A flood crest

Accepted Answer

A)   Usually increases downstream from the area covered by the rain storm.
B)   Is the maximum stage of the river at any point along the stream from a flood event.
C)   Can take years to travel from its initiation point to the mouth of a river.
D)   Is when a stream overflows its normal flow channel and spills out onto the floodplain.

Question 10

When flood recurrence intervals are estimated from historic records,the estimated intervals depend strongly on the length of time represented by the records.

Accepted Answer

A) True 
 B)False

Question 11

On the inside bank of a meander,where water flow slowly,__________ may be deposited.

Accepted Answer

A)   A delta
B)   An oxbow
C)   A point bar
D)   An alluvial fan

Question 12

The total amount of material transported by the stream is called

Accepted Answer

A)   Capacity.
B)   Strength.
C)   Volume.
D)   Load.

Question 13

When a stream bends or curves what begins to form

Accepted Answer

A)   Point bars.
B)   Cut banks.
C)   Meanders.
D)   Oxbow lakes.

Question 14

The volume of water flowing past a point along a stream in a given period of time is the stream's

Accepted Answer

A)   Drainage basin.
B)   Discharge.
C)   Load.
D)   Capacity.

Question 15

Highly porous and permeable soils would reduce flooding.

Accepted Answer

A) True 
 B)False

Question 16

A region has just had a 100-year flood.That means that

Accepted Answer

A)   A flood event of that size has a 1 percent probability of occurrence in the next year.
B)   Another equally large flood will occur in one hundred years.
C)   Another flood of that size cannot happen in the same year.
D)   All of the choices are correct.

Question 17

When a stream carrying suspended sediment enters a reservoir,

Accepted Answer

A)   It deposits its suspended sediment load.
B)   Scouring by the suspended sediment carves the reservoir deeper.
C)   The sediment stays suspended in the reservoir water and pollutes it.
D)   The suspended sediment stays in suspension and is released below the dam, polluting water downstream.

Question 18

Maximum stage is used to describe the magnitude of the flood and when the maximum stage is reached the stream is said to trough.

Accepted Answer

A) True 
 B)False

Question 19

A basin designed to hold surplus surface runoff,keeping it out of a stream is

Accepted Answer

A)   A retention pond.
B)   A drainage basin.
C)   A delta.
D)   An oxbow lake.

Question 20

After disastrous natural floods in the Grand Canyon in 1942 and 1996,the Glen Canyon Dam was built to control those floods.

Accepted Answer

A) True 
 B)False

Exam 6: Streams and Flooding

A basin designed to hold surplus surface runoff,keeping it out of a stream is

Correct AnswerverifiedShow Answer

Maximum stage is used to describe the magnitude of the flood and when the maximum stage is reached the stream is said to trough.

Correct AnswerverifiedShow Answer

After disastrous natural floods in the Grand Canyon in 1942 and 1996,the Glen Canyon Dam was built to control those floods.

Correct AnswerverifiedShow Answer

The total amount of material transported by the stream is called

Correct AnswerverifiedShow Answer

A region has just had a 100-year flood.That means that

Correct AnswerverifiedShow Answer

On the inside bank of a meander,where water flow slowly,__________ may be deposited.

Correct AnswerverifiedShow Answer

When a stream bends or curves what begins to form

Correct AnswerverifiedShow Answer

A cut bank is the outside bank of a meander that is subject to erosion.

Correct AnswerverifiedShow Answer

Unlike streams,lakes do not flood because runoff does not drain into lakes.

Correct AnswerverifiedShow Answer

When a stream carrying suspended sediment enters a reservoir,

Correct AnswerverifiedShow Answer

When flood recurrence intervals are estimated from historic records,the estimated intervals depend strongly on the length of time represented by the records.

Correct AnswerverifiedShow Answer

The U.S.Geological Survey and the National Weather Service work together to

Correct AnswerverifiedShow Answer

A flash flood is a variety of upstream flood.

Correct AnswerverifiedShow Answer

Once formed,meanders enlarge downward only,cutting deeper and deeper over time.

Correct AnswerverifiedShow Answer

The volume of water flowing past a point along a stream in a given period of time is the stream's

Correct AnswerverifiedShow Answer

A hydrograph is:

Correct AnswerverifiedShow Answer

A flood crest

Correct AnswerverifiedShow Answer

Stream-deposited sediments are often well sorted because the size of particles moved is a function of stream velocity,quantity of water,and discharge.

Correct AnswerverifiedShow Answer

Highly porous and permeable soils would reduce flooding.

Correct AnswerverifiedShow Answer

Saltation is a process by which streams dissolve soluble minerals and become saltier.

Correct AnswerverifiedShow Answer

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