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Mahanadi Water Disputes Tribunal completes 5-day Odisha visit

March 02, 2026 5 min read Polity & Governance Geography GS Paper 2 (Centre-State Relations Interstate Disputes) GS Paper 1 (Indian Geography Rivers)
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What Happened

  • The Mahanadi Water Disputes Tribunal (MWDT), led by Chairperson Justice Bela M. Trivedi, completed a 5-day field visit to Odisha in late February–early March 2026.
  • The tribunal team inspected the Hirakud Dam (the primary infrastructure at the centre of the dispute), its spillways, powerhouse facilities, and the command area dependent on the reservoir.
  • Other sites visited: Chiplima Power House, Burla power channel, Debrigarh Wildlife Sanctuary, Satkosia, Kushabhadra river confluence at Ramchandi (near Konark), Satapada jetty, and Chilika Lake (including the sea mouth).
  • The visit is a fact-finding exercise to assess ground realities of water use, flows, and downstream impacts in Odisha — the state at the centre of the dispute.
  • The tribunal's tenure is set to expire on April 13, 2026. Both Odisha and Chhattisgarh have requested a 9-month extension, which is under consideration by the Centre.

Static Topic Bridges

Inter-State River Water Disputes Act, 1956 and Tribunal Mechanism

Water is a concurrent subject under the Constitution, but inter-state rivers and river valleys are governed by Parliament under Entry 56 of the Union List. The Inter-State River Water Disputes Act, 1956 (ISRWD Act) provides the statutory mechanism for adjudicating disputes over the use, distribution, or control of inter-state river waters.

  • Under the ISRWD Act, if negotiations between states fail, the Central Government constitutes a tribunal.
  • Tribunal composition: A Chairman (Supreme Court judge) and two other members (also SC judges), all nominated by the Chief Justice of India under Section 4 of the Act.
  • The tribunal's award is final and binding; it cannot be challenged in any court including the Supreme Court (Section 11 of the Act), though the Supreme Court retains supervisory jurisdiction.
  • Key precedent tribunals: Krishna Water Disputes Tribunal (Bachawat Award, 1976), Cauvery Water Disputes Tribunal (final award 2007), Godavari Water Disputes Tribunal, Ravi-Beas Water Tribunal.
  • The 2002 amendment to the ISRWD Act set a 3-year deadline for tribunals to give their award (extendable with Central Government approval) — a response to the prolonged functioning of earlier tribunals.

Connection to this news: The Mahanadi tribunal was constituted under the ISRWD Act in 2018. Its five-day Odisha visit is a standard fact-finding exercise — tribunals physically inspect infrastructure, water bodies, and dependent communities to build an evidentiary record before adjudicating competing claims.

Mahanadi River Basin and the Odisha-Chhattisgarh Dispute

The Mahanadi is one of India's major peninsular rivers, flowing approximately 858 km before draining into the Bay of Bengal near Paradip in Odisha. Its basin spans Chhattisgarh (upper catchment) and Odisha (middle and lower catchment).

  • Total basin area: approximately 1.41 lakh sq km; covers parts of Chhattisgarh (53%) and Odisha (47%), with smaller portions in Maharashtra, Jharkhand, and Andhra Pradesh.
  • Hirakud Dam (Odisha): One of the longest earthen dams in the world (4.8 km main dam, 25.8 km total including dykes). Constructed in 1956; provides irrigation to 1.5 lakh hectares and generates 307.5 MW of hydropower.
  • Core dispute: Odisha alleges that Chhattisgarh's construction of barrages and reservoirs in the upper Mahanadi has reduced water flows to Odisha, adversely affecting irrigation and river ecology in downstream areas.
  • Chhattisgarh's position: Development of upper basin water resources is within its sovereign rights as a state; the structures are necessary for its own agricultural and industrial development.
  • The dispute intensified after Chhattisgarh (carved out of Madhya Pradesh in 2000) began constructing multiple water storage structures.
  • The tribunal was constituted in March 2018 after Odisha filed an inter-state water dispute with the Supreme Court and a reference was made under the ISRWD Act.

Connection to this news: The tribunal's Odisha field visit — inspecting Hirakud, Chilika, and key river points — is gathering first-hand data on the current state of downstream water availability and environmental conditions that Odisha claims have been damaged by Chhattisgarh's upstream structures.

Chilika Lake — Ramsar Site and Ecological Significance

The tribunal visit included Chilika Lake, India's largest coastal lagoon and Asia's largest brackish water lagoon, located at the end of the Mahanadi delta in Odisha. Its inclusion in the tribunal's itinerary signals awareness of the ecological downstream impacts of the dispute.

  • Chilika Lake area: Approximately 1,100 sq km (seasonal variation between 900 and 1,165 sq km).
  • Designation: India's first Ramsar site (1981) under the Ramsar Convention on Wetlands of International Importance; later listed on the Montreux Record (1993) due to ecological degradation, then removed in 2002 after successful restoration.
  • Ecological importance: Habitat for approximately 160 species of birds (including migratory flamingos from Iran/Siberia), the endangered Irrawaddy dolphin, and numerous fish species that support the livelihoods of approximately 2 lakh fishers.
  • Hydrological link: Mahanadi freshwater flows into Chilika, maintaining the brackish water salinity balance essential for the lake's ecology. Reduced freshwater inflow from upstream diversions can cause hypersalinisation or silting of the lake mouth.
  • The tribunal's visit to the Chilika sea mouth examined changes in sedimentation patterns and salinity, which could be affected by altered upstream flows.

Connection to this news: Chilika Lake's ecological health is directly linked to the Mahanadi's flow regime. Its inclusion in the tribunal's inspection underscores that the water dispute is not merely about agricultural irrigation — it has biodiversity and livelihood dimensions that the tribunal must weigh in its award.

Key Facts & Data

  • Tribunal constituted: March 2018, under Inter-State River Water Disputes Act, 1956
  • Chairperson: Justice Bela M. Trivedi (Supreme Court judge)
  • States in dispute: Odisha and Chhattisgarh (primary parties), with Madhya Pradesh, Maharashtra as additional parties
  • Key site inspected: Hirakud Dam (Sambalpur, Odisha) — one of the world's longest earthen dams, completed 1956
  • Hirakud capacity: Irrigation of 1.5 lakh hectares; hydropower generation of 307.5 MW
  • Mahanadi river length: approximately 858 km; drains into Bay of Bengal at Paradip, Odisha
  • Mahanadi basin area: approximately 1.41 lakh sq km
  • Tribunal tenure expiry: April 13, 2026 (extension requested by both states)
  • Chilika Lake: India's first Ramsar site (1981); Asia's largest brackish water lagoon
  • Legal finality: Tribunal awards under ISRWD Act are binding and not open to appeal in courts