12. Major projects by river: rapid matching
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Once the basin logic is clear, revise the project list in reverse. A question may give the dam and ask for the river, give the river and ask for the state, or give the function and ask for the project. Use a two-way table and never rely on the visual size of a reservoir alone.
Exam lens The safest revision unit is project → river → state/region → function. Current project status is separate from the static river association. |
Core reference table
Koyna | Koyna | Maharashtra; Hydropower; Krishna basin context |
Ukai | Tapi | Gujarat; Irrigation and power |
Idukki | Periyar | Kerala; Hydropower |
Rengali | Brahmani | Odisha; Irrigation and hydropower |
DVC | Damodar | Jharkhand–West Bengal; Institutional multipurpose river-valley system |
Rihand Dam / Govind Ballabh Pant Sagar | Rihand | Uttar Pradesh; Reservoir, power and Son-basin association |
Chapter narrative
Sutlej
Rises near the Tibetan plateau; enters India through Himachal Pradesh and continues to Punjab.
Exam connection: Bhakra–Nangal; receives Beas near Harike.
Common confusion: Bhakra is on Sutlej, not Beas.
Ganga
Bhagirathi rises at Gangotri; Alaknanda joins it at Devprayag, after which the name Ganga is used.
Exam connection: Yamuna at Prayagraj; Ghaghara, Gandak, Kosi and Son.
Common confusion: Do not use Ganga for the headwater stretch before Devprayag in a precise answer.
Yamuna
Rises at Yamunotri; flows through the northern plains and joins Ganga at Prayagraj.
Exam connection: Chambal, Betwa, Ken and Sind are important tributary associations.
Common confusion: Yamuna is a right-bank tributary of Ganga in the commonly taught map.
Ghaghara
Rises in the Himalayan region of Tibet/Nepal and enters the Ganga plain in Uttar Pradesh.
Exam connection: Kali and Rapti are associated tributaries in the basin region.
Common confusion: Different texts use variant names in the Himalayan stretch; follow the question’s context.
Solved practice
Question | Answer standard |
What changes if the river is seasonal? | Storage, irrigation, drought and flood management become more important. |
What changes if the river is transboundary? | Treaty, diplomacy, data and downstream use must be considered. |
What changes if a dam is multipurpose? | Benefits and externalities must both be evaluated. |
What must be rechecked before the exam? | Current project status, disputes, schemes and any ranking claim. |
Revision task Close the book. Reproduce the chapter’s river chain in six links: source → direction → tributaries → states → mouth → project/issue. Then record one mistake in your error log. |