Exam 14: Streams and Floods: The Geology of Running Water

Which of the following is FALSE? A 100-year flood ________.

________ increases the volume of water in and decreases the lag time of a flood.

The total sediment load of a stream consists of all of the following EXCEPT the ________ load.

Within a meander,where is sediment most likely to be deposited?

All else being equal,water will flow faster in a stream that has a ________,which is typically found near the river's ________.

Dead zones occur due to a lack of ________ in the oceans.

Why are artificial levees only useful for some flooding events?

What will happen to a stream if the local base level is increased,for instance,by adding a dam to the river?

Urbanization causes an increase in the volume of water entering a stream due to the abundance of ________ surfaces in cities and towns.

If a large airport,complete with paved runways,parking lots,and many new structures,is built next to a river,what might the effect be?

The ________ is the average number of years between floods.

What is the effect on a river that runs through farmland?

What physical property of the underlying rock would lead to the formation of a cliff over which a waterfall may form?

If a 50-year flood occurs on the Mississippi River this year,what is the probability that a flood of the same magnitude will occur in the following year?

Geological evidence suggests that many millions of years ago,the Amazon basin drained toward the west rather than the east.What caused this drainage reversal?