Consider the following statements regarding Inter-State Water Disputes Act and River Boards Act of 1956:
1. The Inter-State Water Disputes Act empowers the Central government to set up an ad hoc tribunal for the adjudication of a dispute between two or more states.
2. The appellate jurisdiction against the order of the tribunal lies with Supreme Court of India only.
3. A river board can be established by the concerned state governments with the prior approval of Central government.
How many of the above given statements are correct?