Pick one or more CORRECT statement(s) from the choices given below, in the context of upstream and downstream cut-offs provided below the concrete apron of weirs / barrages constructed across alluvial rivers.
- Cut-offs are provided to increase the rate of flow over the weir / barrage.
- Cut-offs are provided to increase the seepage length and prevent failure due to piping.
- The bottom level of cut-offs mainly depends on the scour depth.
- Cut-offs are provided to ensure occurrence of hydraulic jump within the stilling basin.
