Kaveri water dispute

Geography glossary

Also called: Cauvery water dispute, Cauvery Water Management Authority · Topic: Water Resources of India: Availability, Use and Conservation · NCERT: Class 8, Ch 1 "Natural Resources and Their Use"

Meaning

The Kaveri (Cauvery) water dispute is a long fight between Karnataka, Tamil Nadu, Kerala and Puducherry over how to share the water of the Kaveri river. A tribunal (a special body set up to judge one dispute) gave its final decision in 2007 [2]. Then, on 16 February 2018, the Supreme Court fixed each party's share in a normal year and ordered the Cauvery Water Management Authority (CWMA) to be set up to carry out the award.

It is India's best-known upstream–downstream water conflict. It shows why tribunals are slow and why a permanent body is needed to manage a shared river.

Explanation

Why the dispute arises (cause → process → result)

  • Less water per person leads to competition.
  • Population is rising and more land is being irrigated, so demand keeps going up.
  • River water and groundwater are being used up.

  • Upstream and downstream users then fight over the same flow.

  • The Kaveri is an inter-state river. This means the land it drains (its basin) lies in more than one state.

  • Each party is placed differently on the river:
  • Karnataka is upstream (higher up the river, where the water arrives first). It controls the flow before the water reaches the other states.
  • Tamil Nadu's delta is downstream and depends on the river to grow rice.
  • Kerala adds water through the Kabini tributary.

  • Puducherry (Karaikal) is at the tail end, where the river reaches last.

  • Result: any dam or diversion upstream can cut the water reaching the downstream areas. This is how the conflict starts.

  • The monsoon makes it worse. The Kaveri is a peninsular river, so its water comes mainly from the monsoon. In a dry year there is too little water for all four.

The legal path

  • Water is a state subject: Entry 17 of the State List. It is subject to Entry 56 of the Union List, which lets Parliament regulate inter-state rivers in the public interest [2].
  • Article 262 lets Parliament make a law to settle inter-state river disputes and keep courts out of them [2].
  • Under the Inter-State River Water Disputes (ISRWD) Act, 1956, the Centre set up the Cauvery tribunal:
  • Formed 2 June 1990 [2].
  • Interim order (a temporary order until the final decision) in 1991 [2].

  • Final decision on 5 February 2007. Published in the Gazette on 19 February 2013 [2].

  • The 2002 amendment says a published award has the same force as a Supreme Court decree [2].

  • The states still went to the Supreme Court through Article 131 (disputes between the Centre and states) and Article 136 (special leave petitions) [2].

The 2018 Supreme Court verdict

  • Case: State of Karnataka v. State of Tamil Nadu, 16 February 2018.
  • Shares in a normal year (tmcft = thousand million cubic feet, about 28.3 million cubic metres):
Party Share (tmcft)
Tamil Nadu 404.25
Karnataka 284.75
Kerala 30
Puducherry 7
Total for the four 726
  • The court raised Karnataka's share for two reasons:
  • Bengaluru needs drinking water.

  • Tamil Nadu has groundwater available in its delta.

  • Two bodies were set up to carry out the award (2018):

  • Cauvery Water Management Authority (CWMA)
  • Cauvery Water Regulation Committee (CWRC)

What is still unsettled

  • Distress-year sharing. A distress year is a year when the monsoon fails and the river carries less water than normal. How to cut each state's share in such a year is still unclear, so Karnataka and Tamil Nadu keep clashing.
  • Delay. The tribunal took about 17 years (1990–2007) to give its decision, and the decision was published only in 2013 [2].

Where it occurs

  • Source: Talakaveri in the Brahmagiri hills, Kodagu district (Western Ghats, Karnataka).
  • Course: the river flows south-east across the Karnataka plateau and Tamil Nadu. It enters the Bay of Bengal and forms a large delta there.
  • Main tributaries: Hemavati, Kabini (flows in from Kerala), Bhavani and Amaravati.
  • Mettur dam (Stanley Reservoir): in Salem district, Tamil Nadu (Class 8, Fig. 1.13).
  • Tail end: Karaikal (Puducherry), in the delta.
  • Key demand centres: Bengaluru (drinking water, Karnataka) and the Kaveri delta (rice, Tamil Nadu).
  • Who manages it: the CWMA and the CWRC, set up in 2018 after the Supreme Court verdict.

Don't confuse with

  • Mahadayi (Mhadei/Mandovi) dispute: the Mahadayi flows west into the Arabian Sea and the parties are Goa, Karnataka and Maharashtra. The Kaveri flows east into the Bay of Bengal and the parties are Karnataka, Tamil Nadu, Kerala and Puducherry.
  • Periyar diversion (Mullaperiyar): this sends water from the west-flowing Periyar (Kerala) into the Vaigai basin in Tamil Nadu. It is an inter-basin transfer (moving water from one river basin to another) and is not part of the Kaveri sharing.
  • Ganga–Kaveri link: a proposed river-linking scheme to carry surplus Ganga water to the south. It is not the Kaveri dispute and has no share figures.
  • CWMA vs Cauvery tribunal: the tribunal (formed 1990) decided the shares [2]. The CWMA (2018) carries out the shares fixed by the Supreme Court.

Prelims Hooks

  • Normal-year shares (2018): Tamil Nadu 404.25 > Karnataka 284.75 > Kerala 30 > Puducherry 7 tmcft. Total for the four is 726 tmcft.
  • The Kaveri rises at Talakaveri, in the Brahmagiri hills of Kodagu (Karnataka). Kabini is the tributary that flows in from Kerala.
  • Mettur dam (Stanley Reservoir) is in Salem district, Tamil Nadu. It is not in Karnataka.
  • The Cauvery tribunal was formed in 1990, gave its final decision in 2007 and was published in the Gazette in 2013 [2].
  • Trap: the Supreme Court raised Karnataka's share in 2018. The reasons were Bengaluru's drinking water and Tamil Nadu's delta groundwater.
  • Trap: water is in the State List (Entry 17), not the Union List. Article 262 and Section 11 of the ISRWD Act keep courts out of water disputes sent to a tribunal [2].

Mains Points

  • Why the Kaveri dispute dragged on (GS-I/GS-III):
  • Ad hoc tribunals are slow: 1990 to 2007, and publication only in 2013 [2].
  • States reopened the award in court through Articles 131 and 136 [2].

  • Water became an election issue in both the upstream and the downstream state.

  • Geography drives the conflict:

  • Karnataka is upstream and Tamil Nadu's rice delta is downstream.

  • The river depends on the monsoon, so a failed monsoon creates a distress year with no agreed formula for sharing.

  • Way forward:

  • Basin-level bodies like the CWMA and CWRC.
  • A permanent tribunal and a national water data bank.
  • Clear rules for distress-year sharing.
  • Lower demand through better irrigation efficiency, rainwater harvesting and careful use of delta groundwater.

Related concepts

Read more

Sources

  1. 1Class 8, Ch 1 "Natural Resources and Their Use" (primary)
  2. 2ISWD Act and Trans-boundary Water Issues, B.P. Pandey, Director (ISM), Central Water Commission (January 2015)cwc.gov.in · tier 1