Drainage density is the total length of all the streams and rivers in a drainage basin divided by the total area of the drainage basin. It is a measure of how well or how poorly a watershed is drained by stream channels. It is equal to the reciprocal of the constant of channel maintenance and equal to the reciprocal of two times the length of over...
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http://en.wikipedia.org/wiki/Drainage_density
(from the article `valley`) Valley morphology can be described in numerous ways. A useful measure is drainage density , which relates the length of valleys (or streams) to the ...
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http://www.britannica.com/eb/a-z/d/72
Is the measure of the length of stream channel per unit area of drainage basin. Mathematically its is expressed as: Drainage Density (Dd) = Stream Length / Basin Area
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http://www.physicalgeography.net/physgeoglos/d.html
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