Maintenance Dredging

Building or extending ports does not suffice. Following the deposition of sediments, access channels and harbour basins may become silted up quite rapidly. It is of vital importance to ports that the depth of waterways is at all times maintained so that they always remain accessible to shipping traffic. Therefore, large-scale maintenance contracts are put out to tender worldwide, often by way of long-term contracts. Thanks to its very diverse fleet of modern trailing suction hopper dredgers, Jan De Nul Group can offer the most cost-efficient solution in all circumstances.

Often, maintenance dredging projects also aim at improving the water quality. Polluted sediments must be removed and decontaminated. Through its cooperation with Envisan, the group’s own environmental subsidiary, Jan De Nul Group can offer its clients cost-efficient solutions for both the dredging and decontamination process. With these combined dredging and environmental activities Jan De Nul Group can offer both economically and ecologically sound solutions.

 

Germany, Maintenance Dredging of the Ems 2008 - 2009

Maintenance Dredging of the Ems from Emden until the Northsea from KP40 until KP110

Maintenance Dredging of the Ems from Emden until the Northsea from KP40 until KP110

Key figures
Country

Germany

Client's name

Wasser- und Schiffahrtsamt Emden

Contractor's role

Subcontractor

Period
May 1, 2008 to May 13, 2009

Belgium, Maintenance and Deepening Works in the Western Scheldt and the Scheldt Estuary

Maintenance and deepening dredging works in the Western Scheldt and the Scheldt Estuary between Vlissingen and New Sealock at Wintam, on Dutch and Belgian territory, including sludge...

Maintenance and deepening dredging works in the Western Scheldt and the Scheldt Estuary between Vlissingen and New Sealock at Wintam, on Dutch and Belgian territory, including sludge treatment and storage

 

Key figures
Country

Belgium

Client's name

Ministry of the Flemish Community

Contractor's role

Joint Venture Partner (Part JDN 41%)

Period
April 1, 1999 to July 16, 2006
Technical specs
Equipment

Trailing Suction Hopper Dredgers
Cutter Suction Dredgers

Soil

Sand, silt

Volume

Dredging: 89,102,111 m³

Dredging depth

-10 m to -20 m

Argentina, Río Paraná and Río de la Plata

Jan De Nul Group is maintaining the ‘Río Paraná’ and ‘Río de la Plata’ in Argentina.
The ongoing 26-year dredging project increases the navigability of the river so as to provide improved...

Jan De Nul Group is maintaining the ‘Río Paraná’ and ‘Río de la Plata’ in Argentina.
The ongoing 26-year dredging project increases the navigability of the river so as to provide improved communications and trade opportunities for Argentina’s inland river conurbations. This project extends over approximately 1,400 kilometres from the confluence of the ‘Río Paraguay’ and the ‘Río Alto Paraná’ up to ‘Punta Indio’ on the ‘Rio de la Plata’ near Montevideo. This project is without a doubt the largest maintenance dredging project worldwide undertaken so far.

 

Key figures
Country

Argentina

Client's name

Ministerio de Planificación Federal, Inversión Pública y Servicios
Controlling Engineer: Direccíon Nacional de Vías Navegables

Contractor's role

Main Contractor

Technical specs
Soil

Sand, silt, clay

Volume

Opening dredging: 63,000,000 m³ from 01.05.1995 - 31.01.1997
Maintenance Dredging: approximately 33,000,000 m³/year since 2005

Dredging depth

28 - 32 - 34 & 12 feet

Equipment

James Ensor
Niña
Sanderus
Amerigo Vespucci
Manzanillo II
Capitan Nuñez
Francesco di Giorgio
Alvar Nuñez Cabeça de Vaca
Marco Polo
Kaerius
Ibn Battuta