Principally used as a means of flood control in both river and tidal structures, also used on hydro-electric schemes as intake and draft tube gates. Caterpillar gates and "Stoney" gates are others of this type using rollers instead of fixed wheels.
Advantages
High discharge capacity.
Lifting loads greater than Radial gate less than Sliding gate.
Simple in operation.
Can be raised above pier level for maintenance.
Can be lifted and lowered under unbalanced head.
Can be large span up to 40m or high head tunnel type.
Can be plate girder, truss or box girder type.
Disadvantages
Bottom lip profile is critical to reduce vibration.
