Exam 9: Rivers and Flooding

Following Hurricane Floyd in 1999, residents in one part of the state of ________ were relocated from a badly impacted floodplain.

Why did extensive flooding occur upstream of St. Louis during the 1993 Mississippi River flood?

The lag time between peak rainfall and peak stream discharge is typically increased by urbanization.

Urbanization generally increases the lag time between the peak of rainfall and the peak of the resulting flood.

The continuity equation pertains to the accommodation of ________ by a stream channel.

________ consists of straightening, deepening, widening, clearing, or lining existing stream channels.

The 100-year flood is the flood that occurred exactly 100 years ago.

Which type of flood is typically caused by intense rainfall of short duration?

In what way can structural control of floods actually increase flood damage?

The base level of a stream is typically sea level.

The suspended load of most rivers consists mostly of

The ________ is the period of time in which a flood of given magnitude is expected.

For the same amount of discharge, a narrow, shallow channel will have a higher water velocity than will a wide, deep channel.

Why is flood hazard mapping considered an important step in floodplain management?

Streams generally maintain a(n) ________ between the sediment transported and the sediment delivered to the stream.

How do point bars and cut banks differ from one another in a stream system?

Why might logging of a drainage basin change the slope of the river?

What type of river channel is characterized by multiple channels and gravel bars?

The region drained by a single river or river system is the ________.

The portion of rainfall that flows off the land and directly into a river is called