With her hair neatly oiled and braided, wearing her green-and-white school uniform, Selvi sat on the mat waiting for Amma to get her favourite tiffin of idlis and carrot sambar. But today, as she waited she couldn’t smell the usual aroma from the kitchen. 'Here you go, Selvi, finish your tiffin and go to school!' Amma placed a plate with idlis and coconut chutney. 'Before you ask me, let me tell you, no carrot sambar...

They are known to have cradled civilisations, all over the world. They bathed, fed and helped carry humans. What are we talking about? Rivers, of course! With a twist to their modern profile, though, today they also serve as water suppliers for grand industries…