Streams Rivers

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Abundant precipitation makes water an icon of the Pacific Northwest, especially on the west side of the Cascades. Well watered landscapes result in heavy lush growth of trees and other vegetation. Though western Washington is well known for its rainfall, ironically, in typical years, there is a summer drought.

The western slopes of the Cascades receive only 15 to 25 per cent of their annual rainfall from April to September with the remaining 75 to 85 per cent falling from October to March. During the dry summer months stream flow is maintained by water stored in the ground, in the snowpack and in glaciers. Stream is an umbrella term used for all flowing natural waters, regardless of size. This would include springs, brooks, creeks and rivers. The study of streams and waterways in general is known as surface hydrology and is important in environmental geography.

Steams are natural waterways. The source of a given stream may be a lake, a spring or a collection of smaller streams known as headwaters.

Some text used from the following

http://en.wikipedia.org/wiki/Streams

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