SCOURING OR UNDER SLUICES These are the openings in the weir. They are forme by depressing the weir. They have gates fitt in them. The scouring sluices are locat on the side of the weir on which head regulation of the canal, taking off from here, is locat. If two canals are taking off on either side of the river two sets of under sluices should be locat on either side of the weir. Undersluices perform the following functions. A clear well-defined approach channel is preserve in the river just U/S of the canal head regulator. Silt entry into the off taking canals is controlled. When sluices remain close for a few days, silt gets accumulat in the get just U/S of the sluices. This can be easily scour to the D/S side by opening the under sluices from time to time. Low floods can be passed through them without…