Geography
Drainage System of India
Inter-linking of Rivers and Inter-State Water Disputes
River inter-linking for CGPSC: National Perspective Plan, NWDA's 30 links, Ken-Betwa, PKC-ERCP, Godavari-Cauvery and Chhattisgarh's stake, plus water tribunals.
Prerequisites
- Himalayan Rivers and Peninsular Rivers: the basins that the links would join
- Climate and the Indian Monsoon: why water is abundant in some basins and months and scarce in others
- Centre-State Relations: Article 262 and the federal side of water
The Hook: Bastar’s “Surplus” Water and Tamil Nadu’s Thirst
Connect
The Indravati carries a large monsoon flow out of Bastar, and Chhattisgarh irrigates only a small part of the plateau. On paper, the Godavari–Cauvery link plans to carry “unutilised” water from the Indravati sub-basin, collected at a proposed barrage at Inchampalli on the Godavari, south through the Krishna and Pennar basins to the Kaveri delta. Chhattisgarh asks: unutilised today, or unneeded forever?
What is the river inter-linking programme, how far has it reached, and why is it so contested?
Why it matters: Prelims asks the NPP year, NWDA, the number of links, the first project under implementation (Ken-Betwa) and the rivers and states involved. Mains GS-III asks for a balanced evaluation, and the Chhattisgarh angle (Indravati, Mahanadi) is the kind of point that lifts an answer.
Why Link Rivers?
India’s water is unevenly spread in space (Brahmaputra and Mahanadi basins have surplus; western and southern Peninsula, Bundelkhand and Rajasthan are short) and in time (most rain falls in about four monsoon months). Inter-basin water transfer (अंतर-बेसिन जल अंतरण) moves water through dams, canals and tunnels from surplus to deficit basins.
Timeline
timeline
title River inter-linking in India
1972 : K.L. Rao proposes a Ganga-Cauvery link
1977 : Dinshaw Dastur proposes the Garland Canal
1980 : National Perspective Plan (Ministry of Irrigation and CWC)
1982 : National Water Development Agency (NWDA) set up
2002 : Task force on inter-linking after a Supreme Court direction
2012 : Supreme Court directs the Centre to implement the programme
2021 : Union Cabinet approves the Ken-Betwa link
2024 : PKC-ERCP MoU (January) and Ken-Betwa foundation stone (25 December)The National Perspective Plan (NPP, 1980)
| Fact | Detail |
|---|---|
| Prepared by | Then Ministry of Irrigation (now Ministry of Jal Shakti) and the Central Water Commission, August 1980 |
| Implementing body | National Water Development Agency (NWDA), set up in 1982 |
| Links identified | 30: 16 Peninsular + 14 Himalayan |
| Status (as of July 2025) | Pre-feasibility reports for all 30; feasibility reports for 26; detailed project reports for 11 |
| Under implementation | Ken-Betwa is the only NPP link under implementation (as of 2025) |
Two components
| Himalayan component | Peninsular component | |
|---|---|---|
| Idea | Store monsoon flows of the Ganga and Brahmaputra tributaries (many in Nepal and Bhutan) and transfer surplus westward and southward | Transfer surplus from the Mahanadi and Godavari southward to the Krishna, Pennar and Kaveri; also smaller links in the west and centre |
| Examples | Manas–Sankosh–Teesta–Ganga; Kosi–Mechi; Ghaghra–Yamuna; Sarda–Yamuna | Mahanadi (Manibhadra)–Godavari (Dowlaiswaram); Godavari–Krishna; Krishna–Pennar; Pennar–Kaveri; Ken–Betwa; Parbati–Kalisindh–Chambal; Par–Tapi–Narmada; Damanganga–Pinjal |
| Difficulty | Needs agreements with Nepal and Bhutan; seismic, high mountains | Inter-state consent, submergence of forests and tribal lands |
Key Projects
Ken–Betwa Link (first under implementation)
| Fact | Detail |
|---|---|
| Rivers | Ken and Betwa, both right-bank tributaries of the Yamuna |
| States | Madhya Pradesh and Uttar Pradesh: the drought-prone Bundelkhand region |
| Main structure | Daudhan dam on the Ken, with a link canal to the Betwa |
| Approval | Union Cabinet, December 2021 |
| Cost and funding | ₹44,605 crore; 90% Centre, 10% States |
| Foundation stone | 25 December 2024 at Khajuraho, by the Prime Minister |
| Planned benefits | Irrigation in Bundelkhand; drinking water for about 44 lakh people in MP and 21 lakh in UP; 103 MW hydropower and 27 MW solar (official figures) |
| Concerns | Submergence of part of the Panna Tiger Reserve; tree felling; effects on vultures and the downstream Ken Gharial Sanctuary; questions over whether the Ken really has surplus water |
Modified Parbati–Kalisindh–Chambal–ERCP
- Merges the NPP’s Parbati–Kalisindh–Chambal link with Rajasthan’s Eastern Rajasthan Canal Project (ERCP).
- States: Rajasthan and Madhya Pradesh. MoU signed 28 January 2024; foundation stone and a tripartite agreement in December 2024.
- Aim: drinking water and irrigation in eastern Rajasthan and the Chambal region of MP.
Godavari–Cauvery Link and Chhattisgarh
- Proposed by NWDA as Godavari (Inchampalli)–Krishna–Pennar–Cauvery (Grand Anicut).
- It would divert about 148 TMC of water described as the unutilised share of Chhattisgarh in the Indravati sub-basin.
- Chhattisgarh has objected that this water is earmarked for its own future irrigation and hydropower projects in Bastar. Andhra Pradesh and others have raised their own objections over shares. Consensus among the riparian states had not been reached as of 2025–26.
Mahanadi–Godavari Link
- Planned to carry Mahanadi surplus from Manibhadra (Odisha) to the Godavari at Dowlaiswaram (Andhra Pradesh).
- Odisha disputes that the Mahanadi has surplus water, the same argument it makes against Chhattisgarh’s upstream barrages before the Mahanadi Water Disputes Tribunal (2018).
Chhattisgarh is central to the Peninsular plan
The Peninsular component depends on two “surplus” basins, the Mahanadi and the Godavari, and Chhattisgarh is upstream on both (the Mahanadi rises at Sihawa; the Indravati drains Bastar). Any national link plan therefore needs Chhattisgarh’s consent and must account for its own irrigation needs. See Drainage of Chhattisgarh.
Evaluation for Mains
| Arguments for | Arguments against |
|---|---|
| Moves monsoon surplus to drought-prone areas (Bundelkhand, Rayalaseema, Rajasthan) | “Surplus” is disputed; upstream states plan to use the water themselves |
| Expands irrigation and drinking-water supply | Very high cost and long gestation; earlier projects have faced overruns |
| Flood moderation in the Ganga–Brahmaputra plains | Submergence of forests, tiger reserves and tribal villages; displacement |
| Hydropower and inland navigation | Reduced flow to deltas: salinity, sediment loss, threat to mangroves and fisheries |
| Can reduce over-pumping of groundwater | Ecological flow, seismic risk, and international agreements needed for the Himalayan component |
| Cheaper alternatives exist: watershed works, tanks, drip irrigation, crop diversification |
Balanced line for answers: inter-linking can help where surplus and deficit are clear and consent exists, but it must be project-by-project, with environmental flows, rehabilitation and state consent, alongside demand-side measures.
Inter-State River Water Disputes
| Provision | Detail |
|---|---|
| Article 262 | Parliament may by law provide for adjudication of inter-state river disputes and may exclude the jurisdiction of the Supreme Court and other courts |
| Seventh Schedule | Water is a State subject (Entry 17, State List), subject to Entry 56, Union List (regulation of inter-state rivers by Parliament) |
| Laws | Inter-State River Water Disputes Act, 1956 (tribunals); River Boards Act, 1956 |
Major water disputes tribunals (year constituted)
| Tribunal | Year | States |
|---|---|---|
| Krishna (first) | 1969 | Maharashtra, Karnataka, Andhra Pradesh |
| Godavari | 1969 | Maharashtra, Karnataka, AP, MP, Odisha |
| Narmada | 1969 | Gujarat, MP, Maharashtra, Rajasthan |
| Ravi–Beas | 1986 | Punjab, Haryana, Rajasthan |
| Cauvery | 1990 | Karnataka, Tamil Nadu, Kerala, Puducherry |
| Krishna (second) | 2004 | Maharashtra, Karnataka, AP (Telangana later) |
| Vansadhara | 2010 | Odisha, Andhra Pradesh |
| Mahadayi (Mandovi) | 2010 | Goa, Karnataka, Maharashtra |
| Mahanadi | 2018 | Odisha, Chhattisgarh |
Cauvery: the tribunal’s final award came in 2007; the Supreme Court modified it in February 2018 and the Cauvery Water Management Authority was set up in 2018 to implement it.
Memory Tricks
'80-82, 30 = 16 + 14'
NPP 1980, NWDA 1982. 30 links = 16 Peninsular + 14 Himalayan: the Peninsula, with more states and more disputes, has the larger number.
Ken-Betwa in one line
“Daudhan dam, Panna concern, Bundelkhand benefit, Khajuraho foundation, 25 December 2024.”
Don’t Confuse
| This | vs | That |
|---|---|---|
| NPP: 1980 (plan) | NWDA: 1982 (agency) | |
| Ken–Betwa: MP–UP, Yamuna tributaries | PKC–ERCP: Rajasthan–MP, Chambal system | |
| Godavari–Cauvery: Indravati water from Chhattisgarh’s share | Mahanadi–Godavari: Manibhadra (Odisha) to Dowlaiswaram (AP) | |
| Article 262: water disputes | Article 263: Inter-State Council | |
| Mahanadi tribunal: Odisha vs Chhattisgarh (2018) | Mahadayi tribunal: Goa vs Karnataka (2010) |
Common Mistakes
Trap 1: many links are already flowing
As of 2025, only Ken–Betwa among the 30 NPP links was under implementation. Many others are at the feasibility or DPR stage.
Trap 2: the Supreme Court has jurisdiction over water tribunals' disputes in the first instance
Under Article 262 and the 1956 Act, original jurisdiction over a dispute referred to a tribunal is excluded. The Supreme Court has still heard appeals against tribunal awards through Article 136, as in the Cauvery case (2018), so do not write that courts have no role at all.
Trap 3: water is a Union subject
Water is a State subject (Entry 17), subject to Parliament’s power over inter-state rivers (Entry 56, Union List).
Practice
All questions below are original practice questions written in CGPSC style. They are not previous-year questions.
Level 1: Foundation
- The National Perspective Plan for water resources development was prepared in ________.
- The NWDA has identified ________ links: ________ Peninsular and ________ Himalayan.
- The Daudhan dam of the Ken–Betwa link is on the ________ river.
Answers
- 1980 (August)
- 30; 16; 14
- Ken
Level 2: Prelims MCQs
Q1. Consider the following statements about the Ken–Betwa Link Project:
- Both the Ken and the Betwa are tributaries of the Yamuna.
- The project is meant mainly for the Bundelkhand region of Madhya Pradesh and Uttar Pradesh.
- The project is funded equally by the Centre and the States.
Which of the statements given above is/are correct?
- (a) 1 only
- (b) 2 and 3 only
- (c) 1 and 2 only
- (d) 1, 2 and 3
Answer and explanation
(c) 1 and 2 only. Both rivers are right-bank tributaries of the Yamuna, and the project targets Bundelkhand in MP and UP. Funding is 90:10 (Centre:States), not equal.
Q2. Match List-I (Link project) with List-II (States mainly involved):
| List-I | List-II |
|---|---|
| A. Ken–Betwa | 1. Rajasthan and Madhya Pradesh |
| B. Parbati–Kalisindh–Chambal–ERCP | 2. Odisha and Andhra Pradesh |
| C. Mahanadi (Manibhadra)–Godavari (Dowlaiswaram) | 3. Madhya Pradesh and Uttar Pradesh |
| D. Damanganga–Pinjal | 4. Maharashtra (Mumbai water supply), with Gujarat |
- (a) A-3, B-2, C-1, D-4
- (b) A-1, B-3, C-2, D-4
- (c) A-3, B-1, C-4, D-2
- (d) A-3, B-1, C-2, D-4
Answer and explanation
(d) A-3, B-1, C-2, D-4. Ken–Betwa: MP and UP. PKC–ERCP: Rajasthan and MP. Mahanadi–Godavari: from Manibhadra in Odisha to Dowlaiswaram in Andhra Pradesh. Damanganga–Pinjal: mainly for Mumbai’s water supply, with the Damanganga shared with Gujarat.
Q3. Which Article of the Constitution allows Parliament to exclude the jurisdiction of the Supreme Court in inter-state river water disputes?
- (a) Article 131
- (b) Article 262
- (c) Article 263
- (d) Article 246
Answer and explanation
(b) Article 262. Article 131 is the Supreme Court’s original jurisdiction in Centre–State and inter-state disputes, which Article 262 law can exclude for water. Article 263 is about the Inter-State Council; Article 246 distributes legislative subjects.
Q4. The Godavari–Cauvery link proposal plans to divert water from which sub-basin, a matter of concern for Chhattisgarh?
- (a) Wainganga
- (b) Manjra
- (c) Indravati
- (d) Sabari
Answer and explanation
(c) Indravati. NWDA describes the water as the unutilised share of Chhattisgarh in the Indravati sub-basin, to be collected at Inchampalli on the Godavari. Chhattisgarh says it needs this water for its own projects in Bastar.
Q5. The Mahanadi Water Disputes Tribunal, constituted in 2018, deals with a dispute between:
- (a) Chhattisgarh and Odisha
- (b) Odisha and Andhra Pradesh
- (c) Chhattisgarh and Madhya Pradesh
- (d) Odisha and Jharkhand
Answer and explanation
(a) Chhattisgarh and Odisha. Odisha objected to Chhattisgarh’s upstream barrages on the Mahanadi, saying they reduce lean-season flows into Hirakud.
Level 3: Mains Answer Writing
Q1. What is the National Perspective Plan for inter-linking of rivers? (60 words)
Model answer outline
- Prepared in 1980 by the Ministry of Irrigation and the CWC to transfer water from surplus to deficit basins.
- NWDA (1982) identified 30 links: 16 Peninsular, 14 Himalayan.
- Status (2025): feasibility reports for 26, DPRs for 11; Ken–Betwa is the first under implementation (foundation stone December 2024).
- Aim: irrigation, drinking water, flood moderation and hydropower.
Q2. “River inter-linking is a solution to India’s water problems, but not a free one.” Critically examine, with reference to Chhattisgarh. (150–200 words)
Model answer outline
- Intro: Uneven distribution of water in space and time; NPP (1980) and NWDA’s 30 links aim to move monsoon surplus to deficit regions.
- Benefits: irrigation and drinking water in drought-prone areas (Bundelkhand through Ken–Betwa; eastern Rajasthan through PKC–ERCP), flood moderation, hydropower, navigation.
- Costs and concerns:
- Disputed “surplus” and state consent (Odisha on the Mahanadi; Chhattisgarh on the Indravati).
- Ecology: Panna Tiger Reserve, reduced flows to deltas, sediment loss.
- Displacement of tribal communities, especially in Fifth Schedule areas.
- Cost, delays and international agreements for the Himalayan component.
- Chhattisgarh angle: upstream on both “surplus” basins; the Godavari–Cauvery link counts on Indravati water while Bastar’s own irrigation is low; the Mahanadi tribunal (2018) shows how contested upstream use already is.
- Way forward: project-by-project appraisal, environmental flows, fair benefit-sharing with source states, and demand-side reforms (micro-irrigation, watershed works, tanks).
- Conclusion: Inter-linking can be part of the answer, not the whole answer.
Quick Revision Table
| Fact | Detail |
|---|---|
| Early ideas | K.L. Rao Ganga–Cauvery link (1972); Dastur’s Garland Canal (1977) |
| NPP | August 1980; Ministry of Irrigation + CWC |
| NWDA | 1982 |
| Links | 30 = 16 Peninsular + 14 Himalayan |
| Status (July 2025) | PFR 30, FR 26, DPR 11; only Ken–Betwa under implementation |
| Ken–Betwa | MP–UP; Daudhan dam; ₹44,605 crore; 90:10; Cabinet Dec 2021; foundation 25 Dec 2024, Khajuraho |
| PKC–ERCP | Rajasthan–MP; MoU 28 Jan 2024; foundation Dec 2024 |
| Godavari–Cauvery | Inchampalli to Grand Anicut; about 148 TMC of Indravati (Chhattisgarh’s share) water |
| Mahanadi–Godavari | Manibhadra to Dowlaiswaram; Odisha disputes surplus |
| Article 262 | Water disputes; courts’ jurisdiction can be excluded |
| Water in the Constitution | Entry 17 State List, subject to Entry 56 Union List |
| Mahanadi tribunal | 2018; Odisha vs Chhattisgarh |
Key Takeaways
Key Takeaways
- NPP (1980) and NWDA (1982) identified 30 links (16 Peninsular, 14 Himalayan).
- Ken–Betwa is the first link under implementation (foundation stone 25 December 2024); PKC–ERCP followed with a 2024 MoU.
- The Peninsular plan relies on Mahanadi and Godavari “surplus”, which puts Chhattisgarh and Odisha at the centre of the debate.
- Water is a State subject, but Article 262 and the 1956 Act provide tribunals for inter-state rivers.
- Good Mains answers weigh benefits against ecology, displacement, cost and consent.
What’s Next
- Drainage System of India: Quick Revision
- Indian Agriculture: irrigation needs that drive the link debate
- Centre-State Relations: the constitutional side of water disputes
- Agriculture and Irrigation in Chhattisgarh: irrigation coverage in the state
- Environment and Ecology: environmental flows and impact assessment
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