It is contended that the said legislation is unconstitution al and is a piece of colourable legislation for the follow ing reasons: (a) the power of the State Legislature to enact a law on the subject falling in Entry 17 List II, is subject to the provisions of Entry 56 in List 1, and once Parliament had made a declaration in that behalf in section 2 of the River Boards 540 Act, the State Legislature was not competent to enact the impugned law, (b) once the Central Government had entrusted the Cauvery water dispute to an independent Tribunal under the provisions of the Act, it was not constitutionally permissi ble for Karnataka to enact the impugned law, (c) in the case of flowing water the riparian States have no ownership or proprie tary right therein except in the usufruct thereof and, therefore, the power to legislate therein under Entry 17 of List II can extend to only the usufructurary right subject to the right of a riparian State to get the customary quantity of water, (d) the objective of the impugned legis lation is to set at naught the interim order of the Tribunal and to the extent it seeks to interfere with the exercise of judicial powers it is unconstitutional, (e) the impugned legislation is violative of Article 21 of the Constitution as it is intended to diminish the supply of water to Tamil Nadu and Pondicherry which is also against the spirit of Articles 38 and 39 of the Constitution, and (f) the impugned legislation seeks to eclipse the interim order of the Tribunal constituted under an Act made in virtue of Article 262 of the Constitution and being in conflict with the Central legislation is void for repugnancy.