![]() To be effective, the technique requires a flow gradient away from the dredge site, so material is transported to locations from which it is subsequently re-distributed by natural currents. ![]() The water is injected at low pressures, ensuring the sediment material is re-energised as a density current at the bed, rather than being re-suspended into the full water column. ![]() This re-fluidises the silts and fine sands, which then flow by gravity or current from the dredge site. The technique involves the injection of high volumes of water into the recently deposited seabed sediments. The majority of dredged sites within the inner estuary of the Thames, by volume and frequency, are undertaken using water injection dredging (WID), rather than more conventional excavation processes. As such, details of these operations can be found on the 'Other Dredging Activities' page.īack to Existing Dredging Regime Water Injection Maintenance Dredging ![]() Trailing or Trailing Suction Hopper Dredger Maintenance Dredgingīerth operators are responsible for the maintenance of their berths and approaches under the regulation of the PLA and in accordance with the Maintenance Dredging Framework.There are three main types of dredging operations within the Thames. ![]()
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