Entry 56 of List I of Seventh Schedule provides that "Regulation and development of inter-State rivers and river valleys to the extent to which such regulation and development under the control of the Union is declared by Parliament by law to be expedient in the public interest".
Original document can be viewed here on the Ministry of Water Resources website
Entry 17 under list II of seventh schedule provides that:
Original document can be viewed here on the Ministry of Water Resources website
Download both the documents: