Drainage Basins & Rivers
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Aims To define a drainage basin.
To understand the key features of drainage basins
To explain how the drainage basin system works
To learn how to calculate drainage density
Resources
Whaugh Pp 278-279
Sheet 17.1 The river Basin as a System
Bbc.co.uk/Schools/gcsebitesize
What is a drainage basins?
A drainage basin is an area of land drained by a main river and its tributaries
Its boundary, marked by a ridge of higher land, is called a watershed.
A watershed, therefore separates on drainages basin from neighboring drainage basins
The can be enormous or very small
What is drainage density?
The size of the drainage basin is less important than the drainage density.
Total length of all the streams in the drainage basin
-- ------------Divide------------------
Total area of the drainage basin
What is a confluence?
A confluence is where two ( or more ) rivers meet
It is usually y shaped
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Word Count: 543
Date: Sun, 13 Feb 2011 Time: 4:37 PM
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