Explanation:

Only 1

Statement 1 is correct. The River Boards Act provides for the establishment of river boards for the regulation and development of inter-state rivers and river valleys. These river boards are responsible for coordinating activities related to water resource management, flood control, and development projects along the rivers.

Statement 2 is incorrect. A river board is not established by the President on the request of the state governments concerned. Instead, river boards are established by the Central Government under the provisions of the River Boards Act, 1956.