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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 very heavy flow of water, which is greater than the normal flow of water and goes over the stream's normal channel
rises and falls rapidly with little or no advance warning, usually as the result of very heavy rainfall over a relatively small area
an embankment along a stream that protects land from flooding. Levees can be natural or man-made.
a construction of wall across a river that holds back the water flowing through the river, creating a reservoir or lake
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