A river system is sometimes called a drainage system. In its middle course the river flows down gentler slopes.

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Rivers have always been of great use to humans. You can test out of the A brief treatment of deltas follows. Cities need huge amounts of water every day for use in homes and factories. See more. A watershed is the area of land that drains water into a river. While flooding doesn't sound ideal, flood plains benefit from the additional sediment and water. They can prevent frequent flooding, which causes problems for people who live near rivers. River definition, a natural stream of water of fairly large size flowing in a definite course or channel or series of diverging and converging channels.

Definition. Every river is part of a larger system—a watershed, which is the land drained by a river and its tributaries. | {{course.flashcardSetCount}}