ACU-LAM (Cloison à lamelles)

The ACU-LAM Lamella Baffle System is designed to reduce floating debris from entering storm water overflow systems, combined sewer overflow (CSO) systems, sanitary sewer overflow (SSO) systems, retention tank overflows and basin overflows. The ACU-LAM is ideal for installations where structural constraints do not allow for the installation of an ACU-SELF Self-Adjusting Floating Baffle or an ACU-STAT Fixed Baffle.


  • Up to 3 feet (90 cm) of flow depth
  • Modular construction up to 6 feet (2 m) long
  • Low hydraulic resistance
  • Easy to retrofit into existing installations
  • Stainless steel construction

Range of Application

The ACU-LAM Lamella Baffle can vary from a model GAL-B-30-* to GAL-B-90-*. The GAL-B-30-* is designed for 12 inches (30 cm) of flow depth and measures from 24 inches (60 cm) up to a maximum of 6 feet (2 m) in length. The GAL-B-90-* is designed for 36 inches (90 cm) of flow depth and measures from 24 inches (60 cm) up to a maximum of 6 feet (2 m) in length. The ACU-LAM’s model selection is based solely on flow depth and weir length. The units are currently designated with asterix due to the high variety of model options.

System Operation

The ACU-LAM is a baffle system used in installations where there are difficult structural constraints such as where the inlet pipe enters the overflow structure parallel and adjacent to the weir. A standard static baffle would require placement at a certain distance from the weir. This would result in a portion of the influent to be directed to the downstream side of the baffle. As a result, all debris from this portion of the influent will flow over the weir. This problem is avoided by installing the ACU-LAM Lamella Baffle directly on the weir, requiring no additional space within the structure. The ACU-LAM Lamella Baffle consists of a series of vertically mounted, upward sloping, equally spaced, parallel stainless steel plates. The parallel plates are designed to maintain structural integrity for all flow conditions.

This unique design ensures that the overflow inlet slot is always submerged during an overflow event to ensure maximum floatables retention. As a result the debris is retained in the channel for removal by the dry weather flow after an overflow event. Its design also reduces the likelihood that sediments accumulated on the channel floor are stirred up and carried with the overflow.