Exam 9: Rivers and Flooding

Structural flood controls often increase overall flood hazard.

The total load of sediment that a river carries in a given period of time is called

A braided stream usually has just one channel.

The bed load is the dominant portion of the total load for most rivers.

________ are shallow portions of a meandering stream, in which the water is typically fast-moving at low flows.

The principal objective of channelization is to control floods.

Braided channels are typically characterized by fine-grained bed load.

If a stream channel is of constant width and depth, how must increased discharge be accommodated?

________ changes many characteristics of floods in smaller streams.

Flood hazard mapping and floodplain regulation are modern means of reducing flood damages.

What is the best description of the "10-year flood"?

A(n) ________ stream system is one in which multiple small channels are dispersed across a sand or gravel channel.

The floodplain is usually considered as a distinct system with respect to the river system.

The degree of urbanization consists of

A faster-moving stream has greater competence than a slow-moving stream.

The Ventura Beach RV Resort was flooded because

Downstream floods typically cover larger areas than do upstream floods.

The objective of ________ is to maximize beneficial use of the floodplain while minimizing flood damage and the cost of flood protection.

The total load of a river is dominated by the ________ load.

What is river base level?