If ongoing dredging is required, then samples should be recurring to ensure the accuracy of the work. At the same time, a pre-dredge survey should be completed. Sediment samples need to be obtained down to the depth that will be targeted. If there is a specialized problem with the excavation or earthmoving operations, then field testing is required to determine the quantities, characteristics, and location of the material that needs to be removed. The process requires the use of proper equipment and both vertical and horizontal controls to ensure accurate calculations. Detailed records need to be kept of the quantities and intervals of the dredging, allowing future projections to be identified.īefore the project commences, hydrographic surveys should be used to determine the existing depths as well as the depths that will be attained after the dredging operation. The biggest problem is usually the disposal of the dredged material, which means that long-term projections are essential. When dredging projects are planned, the locations and quantities of material are the most important considerations that need to be addressed.
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