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 *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Similar Story

Explainer: Tax-zones, Bhu-Aadhaar and other BBMP property tax guidelines

by May 3, 2024 Governance
A guide to the BBMP property tax assessment, currently underway. Know more about the process challenges and updates for 2024-25.

Every year, the Bruhat Bengaluru Mahanagara Palike (BBMP) collects property tax during the months of April and May, and a 5% rebate is accorded to encourage timely tax payments. This year, however, BBMP has extended the 5% rebate period for property tax payments until July 31, 2024. If you are a property owner in Bengaluru, you can take advantage of this extended rebate period to pay your property tax before the deadline. One of the reasons for the extension, beyond the regular deadline of April 30th, is the Lok Sabha Elections. According to a circular issued by BBMP Chief Commissioner…

Continue reading

Similar Story

Missing names and missed opportunities: A Chennai citizen’s experience of elections

by May 3, 2024 Governance
Irregularities in electoral rolls and voter enrollment in Chennai left many citizens high and dry, while ECI officials looked the other way.

The way the first phase of the 2024 Lok Sabha elections was conducted in Tamil Nadu, especially in Chennai, has laid bare the lacunae in the system. For residents, who were not able to cast their votes despite having valid Voter ID cards, it seemed nothing short of a sham. Every time before the elections, the electoral rolls are updated by Election Commission of India (ECI) officials. Instead of deputing people who are working full-time within the ECI, the work is outsourced to government employees drawn from schools, colleges or other agencies. These ECI staff, who come from distant locations,…

Continue reading