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The Pazhaiyapallam bridge over hyacinth-covered Cauvery near Bhavani town in Erode district in Tamil Nadu. The huge volume of rapidly growing hyacinth obstructs water flow in the river and clogs the irrigation channels (Photo by Anusha Sundar)

The Pazhaiyapallam bridge over hyacinth-covered Cauvery near Bhavani town in Erode district in Tamil Nadu. The huge volume of rapidly growing hyacinth obstructs water flow in the river and clogs the irrigation channels (Photo by Anusha Sundar)