Maintenance dredging is undertaken to keep channels, berths and other areas at their designed depths.Capital dredging is generally undertaken to create or deepen navigational channels, berths or to remove material deemed unsuitable for the foundation of a construction project Capital dredging is dredging to a depth not previously dredged, or to a depth not dredged within the last 10 years.Aggregate dredging - to extract sands and gravels for construction purposes.ĭredging typically falls into two categories.Ĭlearance dredging will usually require a licence but may be suitable for self-service licensing. To be classed as maintenance dredging the activity must take place where: It involves removing recently accumulated sediments such as mud, sand and gravel the level of the seabed to be achieved by the dredging proposed is not lower than it has been at any time during the past 10 years.there is evidence that dredging has previously been undertaken to that level (or lower) during that period.
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