Can the courts save India’s rivers from pollution? Tirupur shows the answer is no

the second — and concluding — part of our trip down the Noyyal (see previous post).

A slum sprawled on one side of the river. In the distance, a factory belched smoke in the air. The riverbed was overrun with weeds and crammed with plastic bags that were half buried into the earth. An earthmover scooped gunk from an open drain and dumped it on top of the debris. The river itself was a thin trickle of black.

Welcome to Tirupur, an industrial city in central Tamil Nadu, where India’s judicial system tried – and failed – to save a river.

The Noyyal is a small river which starts in the western ghats and flows 170 kilometres to merge into the Cauvery. It passes through Tirupur, where factories have been emptying out effluents in its waters ever since a textile hub came up in the 1970s.

After the state failed to protect the river, in 1996, the Supreme Court intervened. It ordered dyeing units in Tirupur to shut down if they could not stop polluting the river. Fifteen years later, in 2011, the Madras High Court followed up by applying the “Polluter Pays” principle, directing the dyeing factories to become zero discharge units by recycling waste water and pumping it back for reuse.

Since then, the larger units in Tirupur have set up their own effluent treatment plants. The smaller ones have come together to set up Common Effluent Treatment Plants. In all, 18 CETPs are operating here.

But the river still does not look clean.

The first part of this series flagged how the state administration in Tamil Nadu has been unable to protect the Noyyal. That story traced the river’s journey from its source till Coimbatore.

This story looks at what happens to the Noyyal after it leaves Comibatore, and why even judicial remedies to protect the river have failed.

How a river in Tamil Nadu turned into a sewage canal

A narrow little rivulet splashes down, bouncing from boulder to boulder as it descends the rockface. It pauses to catch its breath in a tiny pool limned by trees, before rushing downhill again, merging with other streams to form a small river called the Noyyal.

For centuries, the river’s 170-km course used to take it past the farms, forests and villages of Tamil Nadu, before sinking it into the embrace of the great Cauvery.

In recent decades, this landscape has changed.

Noyyal’s basin – the area drained by the river and its tributaries – has become one of the densest urban landscapes in the state. The cities of Coimbatore and Tirupur, which are located here, are now among India’s leading industrial clusters. The basin has seen an exponential rise in population. Between 1991 and 2011, the number of people living here doubled from 19.5 lakhs to 42 lakhs. With more people settling in the cities, the urban population mushroomed from 9 lakhs to 33 lakhs. Such a large number of people moved to the cities that the rural population actually fell.

Spikes in population, urbanisation and industrial activity bring with them questions of sustainability.

At Kovai Kutralam in Kachimanathi Reserve Forest, one of the starting points of Noyyal’s journey, the water is so clear, you can scoop it up to drink.

What happens as it flows ahead?

The first of a two part series on the river.