Environment Canada Study Confirms Efficiency of Mud Cat™ Auger Dredge, and Minimal Resuspension of Solids

A portable hydraulic dredge mounted on a pontoon, the Mud Cat™ features an auger-like cutting device that feeds slurry to the suction intake of a centrifugal pump. The Mud Cat™ was designed to remove fine sediment. The dredge is propelled along an anchored cable and dredged material is discharged through a float-supported pipeline.

This type of equipment is suitable for small or medium-scale projects in shallow waters. Its main advantage is its compact size, which means it can easily be transported by truck to operate in confined and rather inaccessible areas. It can operate in water as shallow as 0.5 m, but not depths greater than 6.1 m. Its production rate is about 90 m3/h. The Mud Cat™ leaves an even bottom.

The Mud Cat™ horizontal auger dredge causes a low rate of resuspension of sediments which is mainly caused by the expulsion of sediment at either end of the auger. This can be reduced by adjusting suction power to the auger rotation speed and the depth of cut. The auger can also be shielded to minimize turbidity.

Source:
St. Lawrence Centre. Selecting and Operating Dredging Equipment: A Guide to Sound Environmental Practices. Document prepared in collaboration with Public Works Canada and the Ministère de l'Environnement du Québec, and written by Les Consultants Jacques Bérubé Inc.
Environment Canada: Restoration Technologies Section