Exam 16: Streams and Floods

Hydraulic action refers to the ability of flowing water to pick up and move rock and sediment.

A ridge or strip of ground separating one drainage basin from another is termed a ____.

_____ meanders are meanders that retain their sinuous pattern as they cut vertically downward below the level at which they originally formed.

A graded stream can be deepening its channel by down cutting while part of its energy is also widening its valley by ______ erosion.

Streams erode rock and sediment by ___.

A "100-year flood" has a _______ percent chance of occurring in any given year.

A _____ is a ridge of sediment built by sedimentation on the middle or banks of a stream channel.

Point bars are sandbars deposited in the middle of river channels.

The movement and interchange of water between the sea,air and land can be visualized by the ____.

Floods are described by ____,the average time between floods of a given size.

___ influences the velocity of a river along with gradient.

The process of deepening of a valley by erosion of a streambed is called __.

A(n)____ stream is one that exhibits a delicate balance between its transporting capacity and the sediment load available to it.

________ are low ridges of flood-deposited sediment that form on both sides of a stream channel and thin away from the channel.

A(n)___ stream flows in a network of rivulets (subchannels)around numerous sandbars.

A trellis stream pattern consists of parallel main streams with short tributaries meeting them at right angles.

A cutoff meander can become an oxbow lake.

A bar in a river channel is a ridge of sediment,usually sand and gravel,deposited in the middle or along the banks of a stream.

_____ are low ridges of flood deposited sediment that form on either side of a stream channel and thin away from the channel.

Saltation of sand grains begins when they are dissolved.