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If these substances are harmful organisms then they will cause a substantial degradation to the environment even after dredging the area Since dredging loosens up the soil, those substances which were previously held fast to the contaminated deposit will find their way into the water and the un-dredged soil.The dredging of contaminated materials will cause the harmful particles to regroup and spread to a larger area in the water body.The effects and the biodiversity impacts of contaminated deposit-dredging are: But sometimes, dredging is also carried out to weed out the contaminations present in the soil. However, all the points mentioned above pertain to dredging of water-bodies with clean soil deposits. The turbidness also causes the already existing contaminations to spread further into the water-body which also affects the marine environment adversely

This poses problems by way of creation of newer and harmful organisms, transferring of unwanted organisms to other parts in the water-body leading to a wider spread of contamination and organic processes by way of release of extra and unwanted nutrients. The turbidness of the soil under the water also changes because of this alteration in the underwater soil composition.Because of the said alteration, the existing habitat of creatures and organisms that depends on the original composition of the soil dies out due to the unfavourableness of the changes caused.Through dredging this composition is altered The soil deposits in any water-body have a certain pre-disposed composition.Some of the effects of dredging can be enumerated as follows: Since the main focus of dredging is to remove the deposits submerged under, the environmental effects of the process also revolve around this focal point. Dredging possess a huge threat to the marine environment and is required to be carried out quite carefully aided only with the help of the right dredgers and dredges. But even though the activity aids regularity in marine traffic, it is not without its disadvantages. Dredging is an activity that is required to be carried out to remove the unwanted deposits from water pathways.