Geol 101 practice
A stream's base level is:
The same as the longitudal profile
The lowest level to which a stream can erode
The same level as the flood level
The amount of material the stream is capable of transporting
A river widens it's valley is by:
Vertical erosion
Headward erosion
Lateral erosion
Deposition that produces deltas at the mouth
A river deepens it's valley by:
Vertical erosion
Headward erosion
Lateral erosion
Depositions that produce deltas at the mouth
Which of the following represents the velocity of a river's water?
V=(width)*(depth)*(discharge)
V= Discharge/(width*depth)
V=(width*depth)/discharge
V=(discharge)*(width)*(depth)
Select all properties from the list that increase as you move downstream in a river
Gradient
Discharge
Velocity
Channel roughness
Select all properties that descrease as you move downstream in a river
Gradient
Discharge
Velocity
Channel roughness
A waterfall flowing down and into a canyon is:
Lengthening its channel by deposition at the mouth
Lengthening its channel by headward erosion
Deepening channel by headward erosion
Widening its channel by lateral erosion
Which side of the curve is transportation? And which is settling?
Transportation is above
Transportation is below
Settling is above
Settling is below
Braided streams occur
On the inside of the meander bend in a stream channel
Downstream from a dam that is placed on a graded stream
When narrow canyons discharge into broad, arid valley floors
When the sediment load of a stream exceeds the capacity
Alluvial fan deposits occur
On the inside of the meander bend in a stream channel
Downstream from a dam that is placed on a graded stream
When narrow canyons discharge into broad, arid valley floors
When the sediment load of a stream exceeds the capacity
Which of the following statements accurately describes what a 100-year flood is?
A 100-year flood occurs once every 100 years
A flood that has a 1% chance of occurring every year
The biggest flood that has occurred in the last 100 years
A flood that is 100 times the stream's normal discharge
True or False: Two 100-year floods can occur in the same year.
True
False
Flood Control: Which of the following are the most recent (most modern) adopted techniques to limit flooding (select all that apply)
Earth mounds (levees) built on river banks to increase the capacity of the channel
Altering a stream channel (straightening) to make flow more efficient - Increases erosion
Dams built to store floodwater and release it slowly
Limit development within the floodplains
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