Introduction
Inter-state river water disputes (ISWDs) in Southern India reflect a complex crisis of hydro-politics, climate variability, and fragmented river basin management. Unlike perennial Himalayan rivers, Southern peninsular rivers are rain-fed and subject to seasonal extremes, which frequently leads to zero-sum resource contestations between riparian states during deficit monsoon years.
Major Continuing Disputes in Southern States
- Cauvery Basin (Karnataka, Tamil Nadu, Kerala, and Puducherry): The dispute is characterized by the hydro-hegemonic position of upper-riparian Karnataka versus the historical downstream agrarian dependence of Tamil Nadu. Despite the Supreme Court's 2018 final allocation and the creation of the Cauvery Water Management Authority (CWMA), acute friction persists due to the lack of an institutionalized, scientific 'distress-sharing formula' during deficient rainfall seasons.
- Krishna Basin (Maharashtra, Karnataka, Telangana, and Andhra Pradesh): Disputes were reignited post-2014 following the bifurcation of Andhra Pradesh. Telangana has sought a fresh tribunal reference under Section 3 of the Inter-State River Water Disputes (ISWD) Act, 1956, objecting to its combined quota allocation under the Krishna Water Disputes Tribunal-II (KWDT-II) award. Operations over common reservoirs like Srisailam and Nagarjuna Sagar remain frequent flashpoints.
- Mahadayi/Mandovi Basin (Goa, Karnataka, and Maharashtra): Centered around ecological and environmental concerns, this dispute involves Karnataka's proposed diversion via the Kalasa-Banduri drinking water project from the Mahadayi basin to the Malaprabha basin. Goa opposes the diversion, citing adverse impacts on estuarine salinity, mangroves, and ecological water security.
Systemic Causes and Institutional Bottlenecks
- Tribunal Inefficiencies and Delays: Adjudication mechanisms suffer from prolonged delays (for instance, KWDT-II has been active since 2004) and an absence of swift compliance and enforcement mechanisms.
- Constitutional and Jurisdictional Overlaps: States often invoke Entry 17 of the State List (water supplies, irrigation, and canals) to construct upstream hydraulic infrastructure, undermining Entry 56 of the Union List (regulation of inter-state rivers). Additionally, states routinely bypass the constitutional bar under Article 262 by appealing tribunal awards before the Supreme Court under Article 136 (Special Leave Petitions).
- Demand-Side Escalation: Unsustainable agrarian patterns—such as the cultivation of water-intensive paddy and sugarcane in semi-arid tracts—coupled with rapid urban and industrial demand in metropolitan clusters, intensify basin stress.
Way Forward and Reform Pathways
- Institutional Restructuring: Implement the recommendations of the Mihir Shah Committee (2016) by subsuming the Central Water Commission (CWC) and the Central Ground Water Board (CGWB) into a unified, statutory National Water Commission (NWC) to manage surface and groundwater conjunctively.
- Legislative Reforms: Enact the Inter-State River Water Disputes (Amendment) Bill to establish a single, permanent tribunal with fixed timelines and a mandatory Dispute Resolution Committee (DRC) for pre-litigation conciliation.
- Integrated River Basin Management (IRBM): Transition from an administrative state-centric allocation model to an ecologically driven IRBM paradigm. This includes mandating environmental flows (e-flows), incentivizing climate-resilient cropping patterns like millets, and promoting micro-irrigation systems.
Conclusion
Resolving Southern India's persistent water disputes demands shifting from adversarial hydro-politics to cooperative river basin governance. Establishing transparent data-sharing protocols, binding distress-sharing algorithms, and basin-level participatory management will be critical for long-term ecological sustainability and regional water security.