20 terms

Geol 101: Chap. 14 Quiz


Terms in this set (...)

A 200-year flood has a recurrence interval of, on the average,
once every 200 years.
The size of a flood is described in terms of its discharge, measured in
cubic feet (or cubic meters) per second.
An annual probability of 4% means there's
a one-in-25 chance that a flood of some given size will happen in any given year.
The discharge of a stream is
likely to decrease downstream in arid regions and increase downstream in temperate regions.
A drainage network
-is an interconnected group of streams.
-drains water toward the ocean.
-collects water over a large area.
Floods can occur
-after a dam or levee breaks, creating a flash flood.
-when a watershed receives more water than it can absorb or evaporate.
-if saturated ground receives additional rainfall.
A channel is
an elongate depression or trough of running water.
Streams on the west side of the continental divide flow into
the Pacific Ocean.
Precipitation that falls on the east side of the continental divide flows to
the Atlantic Ocean.
A trunk stream carries water away from
a drainage basin.
Stream flow is fastest in
the center of the channel near the surface.
The total load that a stream can carry is called its
Meteoric water is
any water that has fallen from the sky.
The efficiency of downcutting depends on
the velocity of flow, the strength of the substrate, and the amount of vegetation cover.
A stream is
any channelized body of running water.
The largest river in the world, on the basis of discharge, is the
Amazon River.
Sheet wash is
a thin film of water that moves down slopes.
Surface snow and ice are part of
the hydrologic cycle.
There is an exchange of water among
oceans, land, and atmosphere.
The flood of the Big Thompson River in Boulder County, Colorado, in 1976 was caused by
a year's worth of rainfall falling over the course of a few days.