Would you drink from River Krishna?


The third longest river in India, Krishna, flows through the state of Maharashtra and meets the Bay of Bengal in the end. The regions of Satara and Sangli receive its bounty. However, a news channel this morning displayed the blame game the people here play. The public blames the sugar industries and the environmental scientists blame the people. What’s the truth? One of my relatives hails from Sangli. Sangli’s co-operative sector has 10 sugar factories and the industrial sector has the other 10. A few years back he complained that his family and people around were falling sick due to water pollution caused by sugar industries in the area. Not sure where he got that information from so I called up the pollution control board. MPCB denied of any pollution caused by the sugar industry the relative mentioned.

Rivers of India map: Wikipedia

To study and manage water, the Watershed Atlas of India provides a systematic picture of river basins in the form watershed maps. In the image below, you can see the various shapes water takes on land before it becomes a river. Rainfall from the mountain overflows down into what we call ‘catchments’. A group of these catchments form ‘sub-watersheds’. A group of sub-watersheds form a ‘watershed’ and a group of watersheds form a ‘basin’.

Watersheds: Howstuffworks.com

In Watershed Atlas of India, the entire river systems of the country have been divided into 6 Water Resources Region, which has been further divided into 35 basins and 112 catchments. These catchments have been further divided into 500 sub-catchments and 3237 watersheds. Basins, catchments and watersheds are hydrological units that provide a system boundary for analysis. Analysis like computation of water balance parameters helps in the implementation of water management schemes.

Krishna Basin Map: Govt. of India

The Central Pollution Control Board of India (CPCB) collaborates with State Pollution Control Boards (SPCBs) concerned with the river basin. In the case of Krishna river it is the pollution control boards of the states of Maharashtra, Karnataka and Andhra Pradesh. Since some of the water goes underground, known as groundwater, two kinds of monitoring are done – surface water monitoring and ground water monitoring. In the country, surface water monitoring is done on monthly or quarterly basis and on half yearly basis in case of ground water. The monitoring network in the country covers 445 Rivers, 154 Lakes, 12 Tanks, 78 Ponds, 41 Creeks/Seawater, 25 Canals, 45 Drains, 10 Water Treatment Plant (Raw Water) and 807 Wells. Among the 2500 stations, 1275 are on rivers, 190 on lakes, 45 on drains, 41 on canals, 12 on tanks, 41 on  creeks/seawater, 79 on ponds, 10 Water Treatment Plant (Raw Water) and 807 are groundwater stations.

In my notes, I’ve defined the parameters that these stations use to infer the water quality. You can find my notes here. One of them is Biological Oxygen Demand (BOD). BOD is ‘a measure of the oxygen utilized by micro-organisms during the oxidation of organic materials’. It indicates the amount of organic material present in water or the amount of ‘organic waste’ in it. Drinking water usually has a BOD of less than 1mg/l, and water is considered fairly pure with a BOD of 3mg/l. But, when the BOD value reaches 5mg/l, the water is of doubtful purity. Below is a picture of the water quality trend of BOD in River Krishna. On an average, looking at the mean values, it looks fairly pure. That doesn’t mean it has been this way the whole time. It has gone through spikes, as seen from the maximum values, which means it has been highly impure at times. Why has the water gone from pure to impure, and to the extent that it reaches values like 17 mg/l?


Water Quality Trend of BOD in River Krishna

Other than BOD, there are other important parameters such as Dissolved Oxygen (DO) and Coliform levels. Following are results from the water quality monitoring stations in Maharashtra. Drinking water should have Total Coliforms (TC) to be 50 MPN/100 ml or less and DO to be 6 mg/l or more. The graphs show unevenness in this regard. The DO is hanging low from 6 mg/l and TC is seen shooting way higher than 50 MPN/100 ml.

Coliform bacteria are organisms that are present in the environment and in the feces of all warm-blooded animals and humans. Coliform bacteria will not likely cause illness. However, their presence in drinking water indicates that disease-causing organisms (pathogens) could be in the water system.

screenshot-cpcb.nic.in 2015-01-10 12-34-12 screenshot-cpcb.nic.in 2015-01-10 12-34-30

Clearly the water is not of the right quality and its either the industries or the people that are contributing to it or both. Here’s a screenshot of an annual report (2004-05) that talks about steps taken to improve water quality of this River.

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screenshot-mpcb.gov.in 2015-01-10 12-53-58







4 thoughts on “Would you drink from River Krishna?

  1. I appreciate your efforts. Talking about pollution in Krishna alone, I think it starts at the core. At the birthplace of Krishna river. The reasons are numerous. Hotels, 9 major co-operative sugar factories in Satara district, and the washed out fertilizers from nearby farms, as a huge amount of fertilizers are used for sugarcane crops. And I really doubt the sewage treatment facilities in India..

    1. True, the washed out fertilizers too contribute to the problem. Many studies indicate use of organic fertilizers with the synthetic ones can solve this problem and also enhance crop productivity. I have also seen commercials recently that advise farmers to use organic pesticides as priority. I’m not sure how efficiently this is practiced. The demand for food is so much that farmers do not have the time or resources to think about such things. The government can make it a lot easier for them.

  2. Most of the work done to clean water or other things is ONLY done on paper in our nation.

    I will not drink water from any river .. We people have polluted everything let alone river water

    1. It is tough to make quick progress in our country. However, looking at our current regulations and policies, I think we are stepping ahead. That’s a good thing. What we can do is stop littering in water, stop washing clothes at the banks and file a complaint when things look wrong.

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