‘Action plan fails to clean Yamuna’

NEW DELHI: A study by The Energy and Resources Institute (Teri) has found that Yamuna needs approximately 3.46 billion litres per day (BLD) of fresh flow of water to be able to sustain aquatic life and support day-to-day activities of people living on its banks. The figure is almost equivalent to the amount of drinking water the city needs everyday. However, not even a fraction of that is being added to the Delhi stretch of the river now. Teri researchers say there is no data on addition of water fresh water as most of it is sewage.

The study that assessed data from various monitoring agencies for the past 10 years also suggested that the Yamuna Action Plans (YAP) may have failed to improve water quality but it has not deteriorated drastically either after its implementation.

The study was presented at a conference on "Cleaning of Indian Rivers" organized by Teri on Tuesday Teri researchers claimed that YAP I and II, which had been implemented at the cost of hundreds of crores may not be a complete failure. "We have found in the data for 10 years that water quality has been very poor but stable. It could have become worse if there was no YAP," said Deepshikha Sharma, researcher from Teri University.

The 10-year data was also used to assess what kind of solutions would help in reducing pollution levels. The research team formulated four scenarios—business as usual (BAU) where no special intervention is made and the water treatment plan goes as per master plan 2021 with interceptor sewers and 100% capacity efficiency of STPs; scenario 2 considers that all STPs are upgraded with advance tertiary treatment options; scenario 3 considers that all the 13 drains on the right bank of the river are diverted into Agra canal, and scenario 4 considers recycling and reuse options, along with scenario 3.

Researchers found that the best option seemed to be scenario 4 where drains are diverted and there is treatment and reuse of sewage water at the same time. The research team has also made recommendations to upgrade water quality—they suggest increasing flow by impounding the river to use water stored during monsoon and releasing it during the dry season, artificial aeration for the stream, its tributaries, open drains, use of treated waste water for irrigation, horticulture and industrial needs. .

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