UK: Land and Water Introduces Duprojet

Duprojet is a new hydrodynamic dredging unit which is solely available through Land and Water Services.

“Duprojet has been designed by our partners Silt UK, with whom we have worked to develop the system over the last 12 months,” announced

This road transportable and versatile unit can carry out water injection dredging projects in those areas that are logistically challenging. The unit can be used on craft that can navigate inland waterway canals and rivers, as well as coastal waters, allowing it to be deployed across diverse projects.

The Land and Water Duprojet technology has been used to successfully carry out projects on the River Tees, River Severn, Sharpness tidal basin and docks and the Gloucester & Sharpness canal. The most recent campaign with the technology has been to dredge Gloucester docks in order to ensure that the tall ships could access the docks to carry out filming for a new movie.

In order to facilitate the tall ships a channel had to be dredged in excess of 4m depth to allow the ships safe passage. The Duprojet has successfully carried out this work during amber drought conditions, which involves co-ordination between the water controllers and the crew on the Duprojet.

The Duprojet has moved sand bars along the Gloucester and Sharpness canal which have not been previously moved with other Hydrodynamic dredgers. It has also moved dense silt build up on the approach jetty at Sharpness basin, which Duprojet moved last year in order to provide greater navigational abilities for the ships accessing Sharpness docks.

It was also successfully deployed to remove silt build up on the lock approach to the River Tees barrage, which it also removed to the Client’s satisfaction.

The Duprojet unit can be mounted from a hiab, or can be used on Land and Water’s bespoke craft in order to gain manoeuvrability in difficult access areas, or in areas where the wash walls are in a fragile condition and can work in shallow waters with a minimum water depth of 1.8m.

Hydrodynamic dredging injects water into the bed to place the sediment into suspension.

The suspended solids are then transported either by a naturally occurring hydraulic gradient, such as an ebbing tide or a hydraulic gradient is created on impounded basins by opening ground paddles to create a flow of water. The suspended solids then move naturally and redistribute along the waterway.

Duprojet has been used in impounded basins, tidal estuaries and canalised river sections.

Press Release, August 19, 2014

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