This type of gate is used mainly where traffic access is required through a flood defence wall. The normal solution would be a side hinged gate which is manually operated, other mechanically operated types have been designed, such as horizontally sliding and vertically rising.
Advantages
Normally manual operation - no power required.
Simple Civil works.
Disadvantages
Obviously can only be operated with no water load
Preferred sealing direction on-seating, but can be designed for an off-seating head.
