Bed bars are used _______________ i. To serve as permanent reference marks ii. To correct alignment and theoretical bed levels of the canal iii. Helps in desilting the canal section during its maintenance Which of the following function of bed bars is/ are correct?

These are masonry or concrete toe wall-like structure constructed at suitable intervals, the R.L of which is taken by double levelling accurately. The depth of the block and its cross-section is kept substantial enough so that it is not disturbed by the flowing water and is safe against scoring. The bed bars helps in keeping a check on the behaviour of the canal w.r.t silting and scouring tendencies.