Dredging is an excavation activity carried out underwater in shallow seas or fresh water areas, with the purpose of gathering up bottom sediments and disposing of them at a different location. This helps to keep the waterways navigable.
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| Dredger in action |
It can also used be used to replenish sand on beaches where sand erosion has occurred or as a technique for fishing for certain species of edible clams and crabs. This is known as fishing dredge.






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