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mediumQ. No. 14303-which-river-is-the-source-of-the-tehri-dam

Which river is the source of the Tehri Dam?

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This question examines an important river-or-lake fact: “Which river is the source of the Tehri Dam?” The correct answer is Bhagirathi. The Tehri Dam is built on the Bhagirathi River (a source stream of the Ganga) in Tehri Garhwal district of Uttarakhand. It is the tallest dam in India at 260.5 meters. The Tehri Hydropower project is one of the largest in India. The old Tehri town was submerged when the reservoir was filled. A river system includes its source, tributaries, distributaries, drainage basin, watershed, channel, floodplain, delta or estuary and final outlet. River behaviour depends on relief, geology, rainfall, snowmelt, sediment load, vegetation and human intervention.

AAlaknanda
BYamuna
CBhagirathi
DMandakini
Correct Answer: BhagirathiYour Answer: C

Explanation

Correct Answer: Option C — Bhagirathi Tehri Dam is built across the Bhagirathi River in Uttarakhand near New Tehri. The Bhagirathi is a principal headstream of the Ganga and meets the Alaknanda at Devprayag, below which the combined river is called the Ganga. The multipurpose Tehri project supports hydropower, irrigation and water supply. - Option A — Alaknanda: It meets Bhagirathi at Devprayag but does not host Tehri Dam. - Option B — Yamuna: Yamuna is a separate Himalayan river rising at Yamunotri. - Option D — Mandakini: Mandakini flows through Kedarnath valley and joins Alaknanda at Rudraprayag. Exam Takeaway: Tehri Dam is on Bhagirathi; Bhagirathi plus Alaknanda forms Ganga at Devprayag.

Important Notes

  • Tehri Dam is located in Tehri Garhwal district of Uttarakhand on the Bhagirathi River near New Tehri.
  • Bhagirathi originates in the Gangotri glacier region and joins Alaknanda at Devprayag, where the river takes the name Ganga.
  • Tehri is a multipurpose project associated with hydropower generation, irrigation support and municipal water supply.
  • Bhagirathi should not be confused with Alaknanda in dam questions. Tehri is on Bhagirathi, while several other Himalayan projects lie in the Alaknanda basin.
  • Mandakini joins Alaknanda at Rudraprayag, while Yamuna follows a separate western Himalayan course and meets Ganga at Prayagraj.

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