Silting refers to the build-up of silt on the bottom of the
harbor or port. This build-up or silting will reduce the effective
depth of the harbor or port, and dredging will have to be conducted
to remove it to restore depth to the port. Silting results from the
emptying of a river or waterway into a bay where the port is
located, or it could result from the action of tides and/or
currents in the ocean. Any of these represent the action of moving
water, and when water moves, it can carry with in any number of
things, including fine sediment that settles out as silt.