Stoplogs

Stoplogs are hydraulic engineering control elements that are used in floodgates to adjust the water level or discharge in a river, canal, or reservoir.

They are typically long rectangular timber beams or boards that are placed on top of each other and dropped into premade slots inside a weir, gate, or channel.

[1] Since the height of the barrier can only be adjusted through the addition and removal of stoplogs, finding a lighter and stronger material other than wood or concrete became a more desirable choice.

When larger flows of water are passing through a stoplog gate, it can be difficult to remove or place individuals logs.

This is done in part because unlike many other types of bulkhead gates that are one continuous unit, both stoplogs and flashboards are modular and can be easily designed to hold back water at varying levels.