Sone River Water-Sharing Agreement

Why in News?

Bihar and Jharkhand signed a landmark water-sharing agreement for the Sone river on 31 August 2026. This crucial pact effectively ends a 25-year inter-state dispute. The administrative disagreement originally began when Jharkhand was carved out of Bihar in November 2000.

Sone River Water Allocation Formula

The newly signed agreement establishes a clear mathematical formula for water distribution. Authorities based this distribution on the original quota assigned to undivided Bihar.

The 7.75 MAF total allocation precisely matches the volume originally assigned to undivided Bihar.

Context of the 1973 Bansagar Agreement

The Bansagar Agreement serves as the foundational legal framework for this inter-state water distribution.

• Madhya Pradesh, Uttar Pradesh, and undivided Bihar signed the original Bansagar Agreement in 1973.
• The pact regulated the waters of the Sone river basin.
• The Sone river is a major southern tributary of the Ganga.
• The river system crucially supports widespread agricultural irrigation across the eastern plains of India.

Institutional Mediation and Resolution Process

The Union Government actively mediated the complex negotiations to finalize this settlement.

• The Union Ministry of Jal Shakti guided the resolution through a dedicated technical committee.
• The Central Water Commission (CWC) chaired this expert mediation committee.
• A major political breakthrough occurred during the Eastern Zonal Council meeting in Ranchi.
• Union Home Minister Amit Shah chaired this decisive meeting on 10 July 2025.

Sone River Water-Sharing Agreement 2026: Exam-Oriented Facts

• Agreement Date: 31 August 2026.
• States Involved: Bihar and Jharkhand.
• Disputed River: Sone River (a major southern tributary of the Ganga river system).
• Total Water Allocated: 7.75 Million Acre-Feet (MAF).
• Bihar’s Share: 5.75 MAF.
• Jharkhand’s Share: 2.0 MAF.
• Historical Basis: The Bansagar Agreement of 1973 (originally signed by Madhya Pradesh, Uttar Pradesh, and undivided Bihar).
• Key Intervening Bodies: Union Ministry of Jal Shakti and the Central Water Commission (CWC).
• CWC Status: A premier technical organisation functioning under the Ministry of Jal Shakti.
• Resolution Milestone: Eastern Zonal Council meeting on 10 July 2025 in Ranchi (chaired by the Union Home Minister).
• Zonal Council Members: The Eastern Zonal Council comprises Bihar, Jharkhand, Odisha, and West Bengal.
• Related Project: The Indrapuri Reservoir Project is directly linked to irrigation planning on the Sone river.