Here is breaking down the salient parts of the study for Chennaiites:
What was the study for?
TNPCB, under the national river conservation programme, collected samples of rivers and major water bodies across Tamil Nadu. The samples were tested for 32 parameters, during which the dismal findings were received.
Why are the rivers labelled ‘dead’?
- As things stand, the water was found unfit for any kind of life form due to the absence of dissolved oxygen at any of the 41 locations in Adyar and Cooum, TOI said. Even the arrival of the monsoon failed to bring a change to the situation. The arrival of showers improved the situation only in areas near the mouth of the river.
- The permissible limits of dissolved oxygen are 2-8 mg per litre.
- A coliform presence between 300 and 1,500 mg per litre was only identified in the samples, the news report said.
Why are Chennai’s rivers polluted?
Discharge of sewage and effluents directly into the water body is a major reason for the pollution, the study noted.
How polluted are Chennai’s rivers?
The rate of solids dissolved each month in these water bodies is between 700 and 5,000 mg per litre, the news report said. The water got high conductivity due to heavy metals and the faecal matter is 70-300 mg per litre in every sample.
Source: https://news.google.com/__i/rss/rd/articles/CBMiqQFodHRwczovL3d3dy50aW1lc25vd25ld3MuY29tL21pcnJvci1ub3cvaW4tZm9jdXMvY2hlbm5haXMtbGlmZWxpbmUtd2F0ZXJib2RpZXMtYWR5YXItY29vdW0tZGVjbGFyZWQtZGVhZC1ieS10YW1pbC1uYWR1LXBvbGx1dGlvbi1jb250cm9sLWJvYXJkLWhlcmVzLXdoeS1hcnRpY2xlLTk3MDg5Mzkw0gGtAWh0dHBzOi8vd3d3LnRpbWVzbm93bmV3cy5jb20vbWlycm9yLW5vdy9pbi1mb2N1cy9jaGVubmFpcy1saWZlbGluZS13YXRlcmJvZGllcy1hZHlhci1jb291bS1kZWNsYXJlZC1kZWFkLWJ5LXRhbWlsLW5hZHUtcG9sbHV0aW9uLWNvbnRyb2wtYm9hcmQtaGVyZXMtd2h5LWFydGljbGUtOTcwODkzOTAvYW1w?oc=5
