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is primarily used for removal of industrial wastes from rivers and harbors. The
production rates are generally low and the distance over which the material may be
pumped is limited. This type of dredge is not generally available.
Elevated-Platform Dredge. This system consists of a pipeline dredge
that incorporates a "jack-up" barge to elevate the equipment above the surface swells.
The system incorporates a submerged discharge pipeline. Availability of this type of
dredge is very limited.
Selection of Dredging Equipment. Principal considerations upon which
equipment selection is made include:
exposure of dredging site
volume and distribution of materials to be dredged
type of material to be dredged
location of disposal area
distance to disposal area
time available for work
availability of equipment.
The US ACE DRP Technical Areas 3 and 4 contain numerous reports on
the types of mechanical dredges listed in this chapter.
DISPOSAL OPTIONS. Disposal of dredged material generally presents
problems, particularly when there is a lack of candidate disposal sites. The beneficial
use of dredged materials should be investigated.
Landfill. Dredged sediments may be used as a landfill for commercial,
industrial, and recreational purposes.
Construction Materials. Coarse sediments are often suitable for use as
construction aggregate. These sediments may be stockpiled for present and future
Marshland Wetland Habitat. After intertidal- and submerged-fill
operations are completed, shellfish larvae, wetland vegetation, or other organisms
indigenous to the locale may be placed in the area to create a productive marshland.