Why in the News?
A protest has erupted in Goa after a scientific paper on water availability and diversion in the Mahadayi basin reignited its long-standing dispute with Karnataka.
About the Mahadayi River:
- Origin: The Mahadayi River (Mhadei in Goa) originates in Bhimgad, Karnataka, in the Western Ghats.
- Length and Flow: It flows 81 km, passing through Karnataka (35 km), Goa (45 km), and Maharashtra (1 km) before reaching the Arabian Sea.
- Basin Area: Covers 2,032 sq km—78% in Goa, 18% in Karnataka, and 4% in Maharashtra.
- Significance: Forms the Mandovi River, essential for drinking water, agriculture, and navigation in Goa.
- Tributaries: Kalasa Nala, Surla Nala, Haltar Nala, Poti Nala, Mahadayi Nala, Pansheer Nala, Bail Nala, Andher Nala and many more. It has a catchment area of 2032 sq.km.
- Topography: Elevation ranges between < 0m and > 980m w.r.t Mean Sea Level, slope of the catchment varies up to 150%. Very high slope we observed in the Ghats (Braganja Ghats).
- Waterfalls: Variations in the terrain has led to formation of various water falls such as the Doodhsagar falls,Vajra poha falls etc.
- Ecology: Supports rich biodiversity, including the Salim Ali Bird Sanctuary.
- Mineral Ores found: Iron, limestone, bauxite, quartz, limestone, sand, clay, lime shell, Manganese, Asbestos, Mica, Lead, Cadmium.
Mahadayi Water Dispute:
- Karnataka’s Project: Proposed the Kalasa-Banduri Nala to divert water to the Malaprabha basin.
- Tribunal Setup: The Mahadayi Water Disputes Tribunal (2010) addressed disagreements.
- 2018 Verdict:
- Karnataka: 13.42 tmcft (1.72 from Kalasa, 2.18 from Bhandura).
- Goa: 24 tmcft (plus 9.395 tmcft for existing use).
- Maharashtra: 1.33 tmcft.
- Concerns: Goa feared impacts on Mandovi navigation; the tribunal cited tidal flow ensures stability.
- Legal Status: Both states have challenged the verdict in the Supreme Court.
Controversy Over CSIR-NIO Report:
- Study Findings: Claimed Karnataka’s diversions would have minimal impact on Goa’s water or estuarine navigation.
- Institutions: Report authored by CSIR-NIO (Goa) and INCOIS (Hyderabad).
- Recommendations: Suggested check dams and a Tillari-style agreement for shared water use and ecological balance.
Tap to read more about Interstate Water Disputes in India.
| [UPSC 2013] Constitutional mechanisms to resolve the inter-state water disputes have failed to address and solve the problems. Is the failure due to structural or process inadequacy or both? Discuss. |
