UNKNOWN to most people, probably the single largest water supply project in the world is taking shape in Gujarat. Such has been the understandable fascination with the expected spread of irrigation from the Sardar Sarovar Project that not much notice has been taken of its drinking water component. Of the 9 million acre ft of Narmada waters allocated to Gujarat by the Narmada Water Dispute Tribunal, 0.86 maf has been earmarked for drinking and municipal water supply and another 0.20 maf for industrial use.