Stoplogs are gates that are primarily used for maintenance and repair of main equipment or gates. It can be used at:

• Upstream of intakes gates
• Upstream of spillway gates
• Upstream of bottom outlets

Their construction is similar to that of the slide gates. Depending on the height to be sealed, the stolog may comprise more than one element. The height and quantity of stoplog panels are influenced by:

• Lifting capacity of handling equipment
• Height of used lifting capacity
• Storage space

Stoplog panels are placed and removed under balanced pressures, by means of a lifting beam. The lifting beam is provided with lifting hooks operated by a system of levers and counterweight.