Rainbowing is a method by which trailing suction hopper dredgers place material in shallow areas by pumping into the air through a hose with a nozzle.

Ground Improvement
Ground Improvement

Ground improvement techniques are used when the behaviour of the fill mass and/or the underlying soil does not meet required design criteria.

Rock Fill

Rock is often encountered during capital dredging projects and this dredged rock can become high quality fill when used within specific guidelines.

Explosive Compaction

Explosive Compaction (EC) involves placing a charge at depth in a borehole in loose soil and then detonating the charge.

Dynamic compaction
Dynamic Compaction Techniques

Dynamic compaction is a technique used for in-situ densification of granular soil deposits by heavy impact.

Vibratory surface compaction
Vibratory Surface Compaction

Vibratory surface compaction is a method used on the surface of a reclamation area to increase the density, shear strength, and stiffness of the fill.


Compaction is used to increase the density of fill and improve properties such as compressibility, shear resistance and resistance against liquefaction.

Dredging Techniques

Dredging techniques cover a wide range of activities and for each project an analysis must be made to determine which technique is appropriate and feasible.