10/10/2023 Defining and assessing benthic recovery following dredging and dredged material disposalRead NowHowever, the replies also showed that a major proportion of the limits did not seem to be scientifically or environmentally founded. The majority of the respondents indicated that they understood and supported the need for environmental turbidity limits. Interestingly, the survey showed that compliance monitoring on average contributed about 1–5% to the cost of the dredging project. In 2016, the CEDA Environment Commission (CEC) conducted a survey among a wide range of companies and institutes working with dredging to investigate which environmental turbidity limits existed for dredging projects, how these limits were set and how the environmental limits affected the projects both financially and time-wise. One potential risk that may result is that on the one hand, the turbidity limits may be overly conservative, while on the other hand, they may also be inadequate in protecting the sensitive receptors. In many cases, turbidity limits may even appear to be defined without consideration of the specific sensitive receptors that are supposed to be protected. A very loose definition of the turbidity limits can additionally have a huge impact on the local environment. Sometimes a very strict or alternatively very ambiguous definition of the turbidity limits can have a serious impact on the project execution methodology proposed by bidding contractors and thus on their quoted price. However, the basis or background of these definitions is not always clear. For dredging projects around the world, many different limit definitions and corresponding turbidity monitoring methods have been applied. Mitigating the impacts of turbidity is usually managed by limiting the amount of suspended sediments released at the dredging sites or entering sensitive areas. Excessive suspended sediment concentration has an impact on water transparency – as a result of increased turbidity – and may cause the degradation of water quality and marine ecosystems.
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