Streams and Rivers. Streams and Rivers Definitions. Tributary: A stream that runs into another stream or river River System: A river and all of its tributaries Watershed: includes all of the land that drains into the river.
Floodplain: a nearly flat area along a stream or river that is naturally subject to flooding.
Delta: a nearly flat plain of alluvial deposit between diverging branches of the mouth of a river, often triangular
Alluvial Deposit: clay, silt or gravel carried by rushing streams and deposited where the stream slows down
(vertical distance/horizontal distance)
Streams flow fastest in the middle, just below the surface
The surface is slower because air provides a little friction
The bottom is slower because the ground provides friction
The sides are slower because the edge/shore provides friction
Most youthful river valleys are V-shaped
V-shaped valleys are found in regions where there is enough rain to erode the sides of the valley
Erosion occurs on the outside of the bends where the water is moving the fastest