Inland Dredging and Desilting

Salix Inland Dredging specialise in the desilting of inland watercourses, lakes, ponds, reservoirs and lagoons.

Salix can advise on the best method for dredging a particular project and the options available for disposing of the dredged material.

Often these works are linked to wetland habitat creation with sediments reused on site to create mosaics of differing wetland habitat types.

This is undertaken by dewatering and excavating the silt in its driest possible form.

Using specialist long reach excavators and low ground pressure wheeled or tracked dumpers silts, woody debris and rubbish can be efficiently removed.

Read more about our methods at Kelham Island Goit

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Mechanical silt removal

This is mechanical excavation without dewatering.

The excavator floating on a pontoon loads mud hoppers which are then unloaded at the bankside for onward removal.

Salix pontoons can be configured to float an excavator up to 20 tons and are all easily transported by road without movement orders.

Read more about our desilting work at Woodberry Wetlands, one of the largest urban nature reserves in the UK.

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Multiple machines dredging from floating pontoons

This involves dredging of a narrow watercourse from the bank using a long reach excavator with or without dewatering or using floating plant.

This is limited to the reach of the machine. Long reach machines available from 6 to 40 tons (8m to 22m reach)

Bankside dredging of silts

Bankside dredging of silts

Shallow ponds and watercourses with difficult access.

Salix operate a spider excavator that is able to climb in and out of difficult locations and wade in 1.2m of water.

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Spider dredging from river side

This uses the water pumped along with the silt as the transport mechanism. This is the wettest process and requires management of the pumped water during settlement and once the silt has settled.

Large pump distances and height differences can be overcome using booster pumps if necessary.

Silts can be dewatered using flocculants to speed up the dewatering process and can be contained in geotubes or lagooned while drying.

Read more about our pump dredging work at Beacon Park.

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Specialist machinery for pump dredging

Disposal of Silt

Salix can guide you though all of the regulations and permit requirements for the disposal and re-use of dredged material.

Our in house team undertake ecological studies and silt analysis as required, as well as bathometric surveys to quantify the volume of material.

For example some of our most recent schemes have seen material spread to agricultural land under an Environment Agency Permit for Land-spreading, straight to a licenced waste facility following treatment as the silt was to contaminated to land-spread and reused within a lake to create marginal planted areas and reed-beds under the CL:arie system.

Read more about our desilting techniques