Which of these statements related to the design of hydraulic structure are correct?

1. In designing a hydraulic structure in permeable foundation by Khosla’s theory, the slope correction is applicable to piles located at the ends of the sloped floors.

2. Khosla’s theory can be correctly applied in alluvium of finite depth.

3. Length of flow has lesser effect on exit gradient than the depth of piles.

4. Intercepts between hydraulic gradient line and free water surface on the glacis and horizontal floor downstream is the unbalanced uplift in a structure.