Since bottom sediments are in an essentially unconsolidated state, grab samples are satisfactory for sediment characterization purposes and are easy and inexpensive to obtain. For unusual maintenance projects or new-work projects, more extensive field investigations are required.įor maintenance work, channel investigations may be based on grab samples of sediment. In the case of routine maintenance work, data from prior samplings and experience with similar material may be available, and the scope of field investigations may be reduced.
If the geophysical survey is required, samples may be required for ground truth interpretations. The level of effort required for channel sediment sampling is highly project-dependent. Sediment sampling and testing are used to determine dredgeability and provide the data necessary for designing the placement and beneficial uses alternatives. Samples of the channel sediments to be dredged are often required for ade quate characterization of the material and for use in laborat ory testing.
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