Chapter 17 Flashcards
Within a drainage system:
All runoff drains into the same stream.
The hydrologic cycle describes:
All of the choices are correct.
When a stream experiences an increase in gradient, it will:
Flow faster and erode its channel.
Between headwaters and base level, a channel will:
All of the choices are correct.
The Hjulstrom diagram tells us that:
Clay and gravel require about the same water velocity to erode.
Why is clay difficult to erode but easy to transport?
Because clay sticks to the channel bed but stays in suspension once it has been eroded.
The lowest level to which a stream can erode is known as the:
Base level.
Channels generally take one of three forms:
Meandering, braided, and straight.
Braided channels form when:
Ability of the stream to transport sediment is exceeded by the amount if sediment.
The discharge of a channel is 75 m wide, 3.2 deep, with a flow velocity of 0.34 m/sec is:
81.6 m3/sec
Flooding is a result of:
All of the choices are correct.
If base level lowers:
A stream will rejuvenate.
Avulsion occurs when:
Flooding causes a stream to establish a new channel to reach base level.
Freshwater stress is:
A situation in which a population consumes more than 10% of its total water supply per year.
A graded profile is one in which:
Sediment deposition is equal to erosion.
