A pitot tube is inserted in a rectangular open channel at a depth of 1 m from the free surface. The rise in the limb of the pitot tube is found at 1.4 m. The width and depth of flow are 4 m and 2 m respectively. The critical specific energy for the flow will be.
1
3.35m
2
2.89m
3
2.21m
4
2.45m