Interlinking of Rivers — Where the 30 Links Actually Stand: A CDS/OTA Geography & Governance Explainer

On 10 August 2026, the Ministry of Jal Shakti placed before the Rajya Sabha a project-by-project status report on the National Rivers Interlinking Programme — all 30 links, each with its stage of preparation. Answers to parliamentary questions rarely make the front page, but for a CDS/OTA aspirant this one is unusually useful, because it converts a vague idea everybody has heard of into a precise, examinable inventory.

The essential finding: after more than four decades, exactly one priority link is actually being built.

The architecture of the programme

• The National Perspective Plan (NPP) for Inter-Basin Water Transfer was formulated in 1980.
• It identified 30 Interlinking of Rivers (ILR) projects — 16 under the Peninsular component and 14 under the Himalayan component.
• The National Water Development Agency (NWDA), established in 1982, is entrusted with the work: water-balance studies, Pre-Feasibility Reports (PFRs), Feasibility Reports (FRs) and Detailed Project Reports (DPRs).
• An Environmental Impact Assessment (EIA) forms part of the preparation of the FR and DPR for every ILR project, covering environmental and socio-economic impacts.

The pipeline of paperwork — PFR, then FR, then DPR, then inter-State agreement, then clearances, then construction — is itself the answer to the question "why has so little been built?" Each stage requires the consent of States that regard water as their own.

The one that is being built: Ken–Betwa

The Ken-Betwa Link Project (KBLP) is, in the Ministry's own words, the only priority link project under the NPP that has entered the implementation stage. Its foundation stone was laid at Khajuraho on 25 December 2024.

Geography worth fixing in memory: the Ken and the Betwa are both tributaries of the Yamuna, and therefore both belong to the Ganga system. Water is transferred from the Ken, assessed as surplus, to the water-short Betwa basin, principally through the Daudhan dam and a link canal. The beneficiary region is Bundelkhand, spanning Madhya Pradesh and Uttar Pradesh — one of India's most drought-prone tracts.

The project also carries the programme's sharpest environmental argument, and a candidate should be able to state both sides fairly. Submergence affects part of the Panna Tiger Reserve, which is why the Ministry emphasises that a comprehensive EIA has been completed along with an Integrated Landscape Management Plan (ILMP) covering catchment-area treatment, landscape-level ecological management, biodiversity conservation, command-area development and long-term environmental monitoring, and that land acquisition and Rehabilitation & Resettlement (R&R) are built into the sanctioned project structure.

The other project in the ground: Polavaram

The Polavaram Irrigation Project (PIP) on the Godavari in Andhra Pradesh incorporates the Godavari (Polavaram)–Krishna (Vijayawada) link. It is classified as a National Project and is executed by the Government of Andhra Pradesh and the Polavaram Project Authority (PPA).

• Irrigation: about 7.2 lakh acres, with stabilisation of 23.5 lakh acres in the Godavari and Krishna delta systems.
• Inter-basin transfer: diversion of 80 TMC of Godavari water to the Krishna basin — the link element proper.
• Drinking and industrial water: including to Visakhapatnam, and domestic supply to about 28.5 lakh people in 611 villages.
• Hydropower: 960 MW.
• Central assistance received: ₹20,658 crore cumulatively.

What the status report reveals about the other 28

Read as a whole, the annexure is a study in how inter-State water politics works:

Movement, of a sort: - The Modified Parbati–Kalisindh–Chambal link (Madhya Pradesh and Rajasthan) has a Memorandum of Agreement signed by both States — the political precondition without which nothing proceeds. - Several Peninsular links have completed DPRs: Godavari (Inchampalli)–Krishna (Pulichintala), Krishna (Srisailam)–Pennar, Krishna (Almatti)–Pennar, Cauvery (Kattalai)–Vaigai–Gundar, and Bedti–Varda. - Because consensus on the Manibhadra and Inchampalli dams remained elusive, a combined Godavari–Cauvery link DPR was completed instead, later updated to terminate at the Manimukhta nadi, a tributary of the Vellar adjacent to the Cauvery basin. This is how the programme adapts when an upstream State will not agree.

Retreat: - Damanganga–Pinjal (water supply to Mumbai) and Par-Tapi-Narmada have completed DPRs but have been dropped from the status of "priority links". - Netravati–Hemavati was not pursued beyond the PFR, because after Karnataka implemented the Yettinahole project, no surplus water remained in the Netravati basin to divert — a neat illustration of how "surplus" is a moving target. - In the Himalayan component, the Kosi–Mechi inter-State link was dropped because of its international dimensions; at Bihar's request NWDA studied an intra-State Kosi–Mechi link instead, whose DPR went to the State Government. The Jogighopa–Tista–Farakka alternative has also been dropped. - Most remaining Himalayan links — Kosi–Ghaghra, Gandak–Ganga, Ghaghra–Yamuna, Yamuna–Rajasthan, Rajasthan–Sabarmati, Chunar–Sone Barrage, Manas–Sankosh–Tista–Ganga, Farakka–Sundarbans, Ganga (Farakka)–Damodar–Subarnarekha, Subarnarekha–Mahanadi — remain at Feasibility Report stage, with only Sarda–Yamuna having a completed DPR.

Notice how many Himalayan links name Nepal among the beneficiaries. That is the structural reason the Himalayan component has moved so much more slowly than the Peninsular one: it requires not merely inter-State agreement but international negotiation.

Why the idea exists at all: the hydrology

The case for inter-basin transfer rests on three facts of Indian physical geography, developed further in the CDS/OTA notes on Himalayan rivers and peninsular rivers:

1. Rainfall is concentrated in time. The overwhelming share of India's precipitation falls in the four monsoon months. Water that is not stored is water that is lost to the sea.
2. Rainfall is concentrated in space. The Ganga–Brahmaputra–Meghna system carries an enormous share of the country's surface water and floods almost annually, while the peninsular basins — Cauvery, Pennar, Krishna in its lower reaches — face recurrent deficit. Himalayan rivers are perennial, fed by snowmelt as well as rain; peninsular rivers are seasonal, fed by rain alone.
3. Demand keeps rising. Irrigation, drinking water, industry and power all draw on the same finite resource. India sits within the internationally used "water-stressed" band on the standard Falkenmark measure, where below 1,700 cubic metres per person per year indicates stress and below 1,000 indicates scarcity.

The promised benefits follow: drought mitigation in deficit basins, flood moderation in surplus ones, additional irrigation and therefore agricultural security, hydropower, drinking water and, on some alignments, inland navigation.

The case against — which an examiner also expects you to know

A candidate who presents only the benefits sounds briefed; one who presents both sounds educated:

• A river is an ecosystem, not a pipe. Diverting flow alters aquatic habitats, fish migration and the riparian zone. Reduced flow to the sea starves deltas of sediment, accelerating coastal erosion and saline ingress.
• Submergence and displacement. Large dams and canals mean land acquisition, loss of forest and the displacement of people whose rehabilitation and resettlement record in India is uneven.
• Cost and time. ₹44,605 crore for a single link is a serious claim on capital that could fund watershed development, micro-irrigation or canal repair, all of which deliver water sooner per rupee.
• The "surplus" is contested. Basin States rarely accept that their water is surplus. The Netravati case shows how quickly a surplus can disappear once the upstream State builds its own project.
• Climate change moves the goalposts. Transfers are designed on historical hydrology. If monsoon patterns shift, a link engineered to move water in one direction may be built for a hydrology that no longer exists.
• Groundwater is the real story. Most of India's irrigated area is watered from wells and tubewells, not canals. Critics argue that groundwater recharge and demand management deserve first claim on attention — a point that connects directly to the agricultural economy.

The constitutional position — high-yield polity crossover

This is where geography meets the Constitution, and it is regularly examined:

• Water is primarily a State subject — Entry 17 of the State List: water supplies, irrigation and canals, drainage, embankments, water storage and water power — but expressly subject to Entry 56 of the Union List.
• Entry 56 of the Union List empowers the Union to regulate and develop inter-State rivers and river valleys, to the extent Parliament by law declares such regulation expedient in the public interest.
• Article 262 allows Parliament to provide by law for the adjudication of disputes relating to the waters of inter-State rivers, and further permits Parliament to bar the jurisdiction of the Supreme Court and all other courts over such disputes.
• Under that authority Parliament enacted the Inter-State River Water Disputes Act, 1956 and the River Boards Act, 1956. Long-standing criticism of delay in tribunal proceedings has driven proposals to replace multiple tribunals with a single standing tribunal supported by a Disputes Resolution Committee.
• The practical consequence: the Union can plan and fund a link, but it cannot simply order it. Inter-State consent — a signed MoA — is the real gate, which is exactly what the status report demonstrates.

The revision hook: National Perspective Plan for Inter-Basin Water Transfer formulated 1980, identifying 30 ILR links — 16 Peninsular and 14 Himalayan — with NWDA (set up 1982) as the agency; Ken-Betwa is the only priority link under implementation, cost ₹44,605 crore, irrigation 11.88 lakh hectares, drinking water 62 lakh people, 103 MW hydro and 27 MW solar, foundation stone at Khajuraho on 25 December 2024, serving Bundelkhand in MP and UP, with Ken and Betwa both tributaries of the Yamuna and an Integrated Landscape Management Plan for Panna Tiger Reserve; Polavaram on the Godavari is a National Project incorporating the Godavari-Krishna link, 7.2 lakh acres irrigation, 23.5 lakh acres stabilised, 80 TMC diverted, 960 MW hydropower, 28.5 lakh people in 611 villages, ₹20,658 crore central assistance; Modified Parbati-Kalisindh-Chambal has a signed MoA; Damanganga-Pinjal and Par-Tapi-Narmada dropped from priority links; Kosi-Mechi dropped for international dimensions; water is Entry 17 of the State List subject to Entry 56 of the Union List, with Article 262 and the Inter-State River Water Disputes Act 1956 and River Boards Act 1956.

Why it matters

• It is a test of federal capacity. The engineering has never been the binding constraint; agreement between States has. The programme is therefore a live case study in Indian federalism, ideal for an essay or a group discussion.
• Water is a security question. Agricultural distress, migration and inter-State friction all trace back to water availability. Officers posted to Bundelkhand, Marathwada or Rayalaseema encounter the consequences directly.
• Ken–Betwa is a genuine test case. As the first NPP link to be built, its outcome — on cost, on schedule, on ecological mitigation and on R&R — will shape the case for or against every remaining link.
• The honest caveat. Thirty links identified in 1980; one under implementation in 2026. Whether that record indicates excessive caution or appropriate prudence is precisely the sort of question worth arguing both ways in an interview.

Exam relevance in one paragraph

For CDS/OTA General Knowledge, retain: the National Perspective Plan for Inter-Basin Water Transfer, formulated in 1980, identified thirty interlinking-of-rivers projects, sixteen under the Peninsular component and fourteen under the Himalayan component, with the National Water Development Agency established in 1982 entrusted with feasibility and detailed project reports and with an Environmental Impact Assessment forming part of every such report; as reported to the Rajya Sabha on 10 August 2026 the Ken-Betwa Link Project is the only priority link to have entered implementation, at an estimated cost of forty-four thousand six hundred and five crore rupees, providing irrigation to about eleven point eight eight lakh hectares, drinking water to about sixty-two lakh people and one hundred and three megawatts of hydropower with twenty-seven megawatts of solar, its foundation stone laid at Khajuraho on 25 December 2024, serving Bundelkhand across Madhya Pradesh and Uttar Pradesh, with both the Ken and the Betwa being tributaries of the Yamuna and an Integrated Landscape Management Plan addressing impacts on the Panna Tiger Reserve; the Polavaram Irrigation Project on the Godavari, a National Project executed by Andhra Pradesh and the Polavaram Project Authority, incorporates the Godavari-Krishna link, irrigating about seven point two lakh acres, stabilising twenty-three point five lakh acres, diverting eighty thousand million cubic feet of Godavari water to the Krishna basin, generating nine hundred and sixty megawatts and supplying about twenty-eight point five lakh people in six hundred and eleven villages, with cumulative central assistance of twenty thousand six hundred and fifty-eight crore rupees; the Modified Parbati-Kalisindh-Chambal link has a Memorandum of Agreement signed by Madhya Pradesh and Rajasthan, while Damanganga-Pinjal and Par-Tapi-Narmada have been dropped from priority status and the Kosi-Mechi link was dropped because of its international dimensions; constitutionally water falls under Entry 17 of the State List subject to Entry 56 of the Union List, with Article 262 enabling the Inter-State River Water Disputes Act of 1956 and the River Boards Act of 1956.

🎯 Practice MCQs

Q1. The National Perspective Plan for Inter-Basin Water Transfer was formulated in: (a) 1980 (b) 1956 (c) 1972 (d) 2002 → (a) — NWDA followed in 1982.

Q2. The number of river links identified under the NPP is: (a) 30 (b) 14 (c) 16 (d) 45 → (a) — 16 Peninsular and 14 Himalayan.

Q3. The agency entrusted with the interlinking of rivers is: (a) NWDA (b) CWC (c) NITI Aayog (d) NHPC → (a) — the National Water Development Agency.

Q4. The only priority link project under implementation is: (a) Ken-Betwa (b) Par-Tapi-Narmada (c) Damanganga-Pinjal (d) Kosi-Mechi → (a) — the others have not entered implementation.

Q5. The Ken and the Betwa are tributaries of the: (a) Yamuna (b) Narmada (c) Godavari (d) Son → (a) — and hence part of the Ganga system.

Q6. The Ken-Betwa Link Project mainly serves which region? (a) Bundelkhand (b) Marathwada (c) Rayalaseema (d) Vidarbha → (a) — across Madhya Pradesh and Uttar Pradesh.

Q7. The estimated cost of the Ken-Betwa Link Project is about: (a) ₹44,605 crore (b) ₹20,658 crore (c) ₹4,460 crore (d) ₹1 lakh crore → (a).

Q8. The wildlife concern most associated with the Ken-Betwa project is: (a) Panna Tiger Reserve (b) Kaziranga National Park (c) Gir National Park (d) Sundarbans → (a) — addressed through an Integrated Landscape Management Plan.

Q9. The Polavaram project is located on the river: (a) Godavari (b) Krishna (c) Mahanadi (d) Cauvery → (a) — diverting water to the Krishna basin.

Q10. Polavaram's installed hydropower capacity is: (a) 960 MW (b) 103 MW (c) 27 MW (d) 500 MW → (a).

Q11. Water appears in the Seventh Schedule primarily under: (a) Entry 17 of the State List (b) Entry 17 of the Union List (c) the Concurrent List only (d) the Residuary powers → (a) — subject to Entry 56 of the Union List.

Q12. Which Article deals with adjudication of inter-State river water disputes? (a) Article 262 (b) Article 263 (c) Article 249 (d) Article 356 → (a) — Article 263 concerns the Inter-State Council.

Q13. The Inter-State River Water Disputes Act was enacted in: (a) 1956 (b) 1980 (c) 1950 (d) 2002 → (a) — along with the River Boards Act, 1956.

Q14. The Netravati–Hemavati link was not pursued beyond the PFR because: (a) no surplus water remained after the Yettinahole project (b) of an international dispute (c) of excessive cost (d) the rivers do not exist → (a) — surplus is not a fixed quantity.

Q15. Which link was dropped because of its international dimensions? (a) Kosi–Mechi (b) Ken–Betwa (c) Sarda–Yamuna (d) Bedti–Varda → (a) — an intra-State alternative was studied instead.

📋 How this gets asked (PYQ pattern)

River interlinking is a standing CDS/OTA topic with four familiar framings. The count and split — 30 links, 16 Peninsular and 14 Himalayan — is the most-asked single fact, and the usual distractor swaps the two component totals. Tributary and basin matching — that the Ken and Betwa are Yamuna tributaries, that Polavaram is on the Godavari, that Bundelkhand spans MP and UP — is the geography half. Institution and constitutional matching — NWDA, Entry 17 versus Entry 56, Article 262, the 1956 Acts — is the polity half, and a paired-statement item that puts water in the Union List is a frequent trap. Project specifics — the Ken-Betwa cost, hectares and power figures — reward anyone who has read the actual release. The fresh 2026 hook is the Ministry's confirmation that Ken-Betwa remains the only priority link under implementation. Note the pattern, not any particular past question.

Preparing for CDS or OTA? Water resources sit at the junction of geography, polity and economics, which is why they recur in the written paper and in the interview alike. Follow our daily CDS/OTA current affairs and prepare with our faculty in the upcoming Cavalier courses in Delhi.

✍️ Written by Aditya Tiwari — Geography, economy & current-affairs faculty at The Cavalier. Reviewed by the Cavalier Faculty Desk. The Cavalier, founded by ex-Army officers, has trained NDA/CDS/SSB aspirants since 2001 (Facebook · YouTube).

Source: PIB / Ministry of Jal Shakti (Rajya Sabha USQ 2473), 10 August 2026. Facts cross-verified with independent sources.