In this Act, unless the context otherwise requires,--
         (a) "prescribed" means prescribed by rules made under this Act;
         (b) "Tribunal" means a Water Disputes Tribunal constituted under section 4;
         (c) "water dispute" means any dispute or difference between two or more State Governments with respect to--
             (i) the use, distribution or control of the waters of, or in, any inter-State river or river valley; or
             (ii) the interpretation of the terms of any agreement relating to the use, distribution or control of such waters or the implementation of such agreement; or
             (iii) the levy of any water rate in contravention of the prohibition contained in section 7.