Exam 13: Floods

In the late spring and summer of 1993,the upper Mississippi River basin experienced record high floods.However,the floodwater mass did not significantly affect the lower Mississippi River basin because _______________.

The largest flood known in an area is likely to be exceeded someday by a larger one,even in an area with a long history.

Between 1960 and 2006,floods in the United States resulted in an average of _______ deaths per year.

Most flood-related deaths in the United States are caused by flash floods,and about 50 percent of these deaths are vehicle-related.

If a stream has a meandering section,that section is most likely to be ________________.

During the great flood of July 1993,the southeastern United States experienced ________________.

With respect to channelization,straightening the channel ____________________.

If a stream is choked with sediment and has insufficient water to carry it away _______________.

When ice dams in front of the largest glacial lakes failed,stupendous floods resulted whose passage is still recorded _________________.

What is the probability that a 100-year flood will occur at least once in 100 years?

The "channeled scablands" of the state of Washington were caused by _________________.

The 1993 flood in the central United States was caused by ___________________.

The probability that a 100-year flood will occur at least once in 100 years is 1%.

On a given stream,small floods happen _____________________.

Statistically speaking,the larger the floods,the shorter are the recurrence times between them.

A braided stream has ____________.

Why are floods so common along the Red River of the North (in North Dakota,South Dakota,and Minnesota)?

In the United States about 2.5% of the land is floodplain and home to about _________ of the population.

Between 1960 and 2006,floods in the United States produced an average of _______ in damage per year.

The __________ is reputed to have killed more people than any other natural feature.