Section 79(3)(a) in The Punjab Reorganisation Act, 1966
(a)the regulation of the supply of water from the Bhakra-Nangal Project to the States of Haryana, Punjab and Rajasthan having regard to -(i)any agreement entered into or arrangement made between the Governments of the existing State of Punjab and the State of Rajasthan, and(ii)the agreement or the order referred to in sub-section (1) of section 78;