Careful use of the water dredge ensures that artifacts can be recorded in context and features and stratigraphy can be studied. As the water dredge will remove particles held in suspension in the water, provided it is used correctly it will improve visibility in the immediate area of the excavation. The archaeologist can also place overburden material directly into the mouth of the dredge. The archaeologist dislodges the material using a trowel, brush or by making a fanning motion with the hand to cause a current to dislodge sediment. It is used to carry away sediments, not to dig holes. In the hands of a trained archaeologist, the water dredge performs the same function as a wheelbarrow on land. The diameter of the tube depends on the power available from the pump and whether delicate work is required. The tube can be made of any rigid material such as steel or plastic. Water and sediment are sucked from the excavation site and released from the far end of the tube. The Bernoulli effect from the flow of pumped water causes suction at the mouth of the dredge. It consists of a large bore straight tube to which is attached a hose pipe through which clean water is pumped. Airlifts may be used for the same purpose.Īrchaeologists preparing a water dredge on a shallow site A water eductor or water dredge is an eductor-jet pump-based tool used by underwater archaeologists to remove sediments from an underwater archaeological site.
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