Watershed

noun (countable)

/ˈwɔː.tər.ʃed/

The land area that drains all precipitation and surface runoff into a common river, lake, or other water body; also called a drainage basin or catchment. Watersheds are bounded by topographic divides (ridgelines) and are the natural unit for integrated water resources management. India has 6 major river systems with distinct watersheds; watershed development programmes (under PMKSY-WDC and Integrated Watershed Management Programme) treat the watershed as the planning unit for soil conservation, groundwater recharge, and rural livelihood improvement, especially in rain-fed agriculture regions.

✍️ Usage in a UPSC answer

India's Integrated Watershed Management Programme treats the micro-watershed as the basic planning unit, co-investing in ridge-to-valley treatments — from afforestation at the crest to check-dam construction at the base — to maximise rainwater harvesting efficiency.

Synonyms

drainage basincatchment areariver basinhydrological unitcatchment

Antonyms

water divide (ridgenot the basin)interfluves

🌱 Word Family

watershed management (noun phrase), drainage basin (synonym phrase), catchment area (noun phrase), waterway (noun), water divide (noun phrase)

🔡 Root

Old English wæter = water; Old English/German scēad = divide, separation (from sceadan = to separate)

📜 Etymology

A compound formed from Old English wæter (water) and shed (a divide, from sceadan = to separate, divide). The metaphor is of water being 'shed' (shed = dispersed/divided) from a ridge in different directions. In American English, watershed refers to the drainage basin itself; in British English, it historically meant only the dividing ridge — a distinction important in geography questions.

🧠 Memory Hook

WATER + SHED: water is shed (dispersed) from a ridge. Picture rain falling on a mountain ridge: to the left it flows into River A's watershed; to the right into River B's. The shed is where the parting of the waters happens.

📝 Seen in UPSC Question Papers

Mains 2019 · GS3 · 10 marks — Agriculture
Mains 2016 · GS1 · 12.5 marks — Modern History
Mains 2016 · GS1 · 12.5 marks — Geography

Real UPSC previous-year questions whose text uses “Watershed” — proof this word earns its place on your list.

🌿 Environment & Ecology 📖 Seen in: Ecology Fundamentals — Ecosystems, Foo...

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