Discussion
Which of these best describes a watershed?
Answer: D
Correct answer: The area of land drained by a river and its tributaries
A watershed, or drainage basin, is the whole area of land from which water drains into a single river system. Its outer boundary is the divide, a ridge line beyond which precipitation flows to a different system. Basins nest inside one another: every tributary has its own, contained within the larger basin of the river it joins. The Ganga basin covers about a quarter of India’s land area on this reckoning. The concept matters for management because a river integrates everything that happens on its catchment - deforestation, fertiliser use, urban runoff - which is why water planning is now organised around basins rather than administrative borders, and why disputes over rivers such as the Kaveri involve every state in the basin. The mouth of a river, a dam and a flood are all features found within a basin, not definitions of one.
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