''1. This Act extends to the defile and waters of the Irrawaddy River between the village of Sinbo in the Myitkyina District and the town of Bhamo in the Bhamo District. 2. In this Act. unless there is anything repugnant in the subject or context.— (1) “ defile ” means the defile and waters of the Irrawaddy River between the village of Sinbo in the Myitkyina District and the town of Bhamo in the Bhamo District ; (2) “ steam-vessel ” includes a motor-launch or other vessel propelled by mechanical means : and (3) “vessel ” includes a steam-vessel, boat, raft or timber. 3. (/) The President of the Union may make rules regulating the navigation of any traffic in the defile. (2) Without prejudice to the generality of the foregoing power, such rules may contain directions as to all or any of the following matters, namely :— (a) prohibiting vessels or specified classes of vessels from entering the defile when the water is high or likely to rise or in other cases of special danger ; [b) prohibiting or authorizing specified officers to prohibit specified classes of vessels from entering the defile or specified parts of the defile during specified periods or during a specified number...''