Exam 13: Floods

An effective mitigation strategy against flooding is to construct many sewers,gutters,and drainage channels to remove precipitation from city streets and get it to streams as quickly as possible.

Base level __________________.

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

If a dam is removed from a river,the river will respond by eroding sediment deposited in the former reservoir and transporting it downstream.

When flooding occurs along a river,as you go farther downstream _________________.

About 50% of flash flood deaths ________________________.

Even though a "150-year flood" may occur one year,it is still possible for another of the same size to come again in the following year,or even in the same year.

Hydrographs from urban settings _____________________.

A president is limited by the Disaster Relief and Emergency Assistance Act to declaring only one flood every year as a federal disaster.

The weather pattern was remarkably similar for the big floods of 1927,1973,and 1993 in the upper Mississippi River basin.

Factor(s)that interact to make streams seek equilibrium include ________________.

A meandering stream lengthens its flow path,lowering the stream's gradient,and thus increasing the speed of its water flow.