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. Evaluating the dredge plant requirements.Considering the applicable environmental, social, and institutional factors that need to be addressed.Identifying potential alternatives for the disposal.Determining the chemical and physical characteristics of the sediments.Assessing the location as well as the amount that needs to be dredged, based on future needs on the site.Preliminary data collection for a dredging and dredged material disposal project should include: On the other hand, long-term goals are focused on the operation and management of the disposal areas. Ideally, the dredging process should be done using the best technical options that are both economically feasible and environmentally compatible. Typically, short-term focus is on the channels that are needed for existing navigation, but it doesn’t necessarily need to be based on the project dimensions.
The operation for dredging and dredged material disposal needs to cover both short-term and long-term management goals.
This guide is designed to provide an overview of the information that should be considered for these decisions. When new work and maintenance projects require dredging and materials disposal, then specific guidance should be followed for the evaluation of equipment and disposal. Dredging spoil is deposited in a transport barge as a pontoon crane dredges a canal.
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