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Stream Tables Vocabulary A drainage basin is a system of rivers and streams that drains an area like the Colorado Plateau Erosion wears away earth materials by water, wind, or ice. A landform is a shape or feature of the earth’s surface, like a delta or canyon. A canyon is a V-shaped valley eroded by a river or stream. A delta is a fan-shaped (triangular) deposit of earth materials at a mouth of a stream. A plateau is a large, nearly level area that has been lifted above the surrounding area. Deposition is the process by which eroded earth materials settle out in another place. Sediments are eroded earth materials that have been deposited. A basin is a low area in which sediments are often deposited. A channel is the course or path the water takes in a stream or river. A meander is a curve or loop in a channel. A slope is the angle or slant of a stream channel or land surface. An alluvial fan is a fan-shaped landform deposited at the end of a steep canyon where the slope becomes flatter. Fans are usually found in arid regions, like Death Valley A flood is a very heavy flow of water, which is greater than the normal flow of water and goes over the stream’s normal channel. A flashflood rises and falls rapidly with little or no advance warning. A levee is an embankment along a stream that protects land from flooding. Levees can be natural or constructed. A dam is a construction or wall across a river that holds back the water flowing through the river, creating a reservoir or lake. A floodplain is the area around a river that is covered by water flowing over the riverbank during a flood.