KAVERI 101 – calculating water sharing based on actual inflow

by November 11, 2016 Governance
  1. See the map to Identify the 4 major reservoirs in Karnataka : Hemavathy, Harangi, KRS and Kabini. Inflows and Outflows to all 4 reservoirs are monitored and known and this forms the basis of all calculations
  2. The river flows into TN and at Biligundlu there is a measuring station that tells you how much water flows into TN from Karnataka
  3. The water that flows into the river downstream of KRS and Kabini is measured at Biligundlu, is expected to flow in from about 22,000 sqm and in an average year can contribute about 80TMC.
  4. About 740TMC is the total water that is expected to flow into the river (from all states)
  5. Of this the following allocations have been made (the states are entitled to the following volumes of water
    1. Kerala: 30TMC
    2. Karnataka: 270TMC
    3. TN : 419TMC
  6. The total inflows into the river from Karnataka is 462TMC. Of the 462 TMC, Karnataka can keep 270TMC for itself and has to give TN 192 TMC (this is measured at Biligundlu). For the purpose of this post, we assume that the basis of this split is agreed upon (270 keep, 192 give)
  7. So if you see the only real numbers that matter are, irrespective of rainfall across the catchment, based on the total inflows in Karnataka,
    What Karnataka keeps                                           270
    —————————–                          =              ——
    What Karnataka gives TN                                      192
Hence if the total inflows in Karnataka was 100TMC, Karnataka can keep 58.44 TMC and send to TN 41.56TMC. Hence one would not need to base it on the % rainfall deficit/surplus – but on actual inflows. The inflows can be measured on a daily basis, the corresponding keep and give numbers calculated and released at some predetermined/useful frequency. It seems fair? And simple?
 
Now the inflows to/from all reservoirs are known, the additional inflow from 22,000 sqm at Biligundlu is also known. This should make the actual sharing numbers even in a deficit year – a reasonable and clear calculation.
 
Thanks to zenrainman’s FB post on the same topic for a slightly more elaborate description. And if you ask whats TMC ? That for another post 🙂

The flow of the Kaveri till she reaches Mettur

The flow of the Kaveri till she reaches Mettur

Sections:

About Shubha Ramachandran

Shubha Ramachandran is a Water Sustainability Consultant at BIOME Environmental Solutions Pvt. Ltd.
Read more by Shubha Ramachandran

Leave a Reply

Your email address will not be published. Required fields are marked *

Similar Story

We have initiated the climate budgeting process this year: BCAC Chairperson Preeti Gehlot

by March 11, 2025 Governance
Ward Climate Action Plans will promote rainwater harvesting and identify eco-sponge spaces in Bengaluru, she said in an exclusive interview.

Once known for its pleasant climate, Bengaluru now faces a climate crisis. Rapid urbanisation, vehicular emissions, and construction dust have led to hazardous air pollution, with PM2.5 and PM10 levels endangering health. Rising temperatures, water scarcity, vanishing green cover, and rampant concretisation have intensified the urban heat island (UHI) effect. Erratic rainfall and groundwater depletion further threaten a water emergency, affecting households across the city. The Bengaluru Climate Action and Resilience Plan (BCAP) was introduced in November 2023 to build adaptation and resilience against climate change, but implementation gaps persist. The absence of a dedicated climate budget, lack of transparency…

Continue reading

Similar Story

Frequently asked questions on laws for registration of apartment associations

by March 7, 2025 Governance
Part 2 of the series on laws that govern Bengaluru's apartment ownership examines advantages and disadvantages of different legislations.

In the first part of this series, we explored the legal and practical challenges faced by apartment owners and associations and the need for clarity about the legislations that govern apartment ownership in Karnataka. Part 2 focuses on frequently asked questions about the registration of apartment associations and takes a closer look at the regulatory landscape in the State. There is a general confusion in Karnataka about the legislation under which apartment owners' associations must be registered. Although the Karnataka Ownership Act, 1972 (KAOA, 1972) provides for registration of owners' associations, it does not mandate such registrations or prescribe any…

Continue reading