The Real Benefit Of Becoming An Individual Member Of CEDA

Young CEDA pitch talks at the CEDA Dredging Days 2017 (Credit: CEDA)
Young CEDA pitch talks at the CEDA Dredging Days 2017 (Credit: CEDA)

Do you remember the beginning of my website two years ago? The first public posts on this website were about the CEDA Dredging Days 20171. It has been a long time since then. Back then, I couldn’t have guessed what direction this website would take. By now, this is my sixtieth post! Some memorable moment in itself. Still, I would like to do what I intended to do: share knowledge about dredging. And a preview on the next CEDA Dredging Days in Rotterdam2 is a fitting commemoration of all the other posts in between.

Off course, the renowned CEDA Dredging Days are a platform to meet people and exchange knowledge. Especially all the presentations. That everybody has been sweating on writing the manuscript. Reviewed by the scrutiny of the Technical Paper and Program committee3. From personal experience, I can tell you, there are a lot of interesting papers. You’ve had already a teaser on the presentation of Camille Kapela4, about the dredging project in Monaco5.

Camille Kapela at the CEDA Dredging Days 2017 (Credit: CEDA)
Camille Kapela at the CEDA Dredging Days 2017 (Credit: CEDA)

Another I would recommend is the presentation of my colleague Frank de Hoogh about the new MAD gravel hopper dredge6. It is not just another boat, it is a change of concept. And there are so many interesting innovations on this dredge, that it merits its own sneak preview.

Innovative Marine Aggregate Dredge for gravel dredging
Innovative Marine Aggregate Dredge for gravel dredging

But there are more interesting perspectives on the event. In contrast to other commercial conferences on dredging, this is like a gathering of a community. It is a place for all the commissions and working groups within CEDA to present their efforts and show the reports and results of their work. There is a presentation of the Working Group on contract selection7, an update from of the Working Group on soil investigation and an interactive session themed on the recently published book: ‘Dredging for Sustainable Infrastructure’8.

The interactive session at the previous CEDA Dredging Days (Credit: CEDA)
The interactive session at the previous CEDA Dredging Days (Credit: CEDA)

Above all, it is a social event. All the knowledge presented would be worthless, when there is no community that absorbs the produced information. Would discuss about the content, the feasibility and possible applications. And these discussions generate innovative ideas on the new insights from the presentations and meetings.

Sometimes, I am asked: ‘What good is it to be a CEDA member myself? I can get the benefits of the presentations, the reduced price and the drinks, through the membership of my company. Why would I throw out my personal money?’ Well, it is not about all that. It really is about people and building a community. Having a (small) personal investment brings you in the state of mind, that you belong to this wonderful community with its long history in shaping the world. And that is the real benefit of being an individual CEDA member9. With this personal contribution you can take part of shaping the future of the world.

Thursday evening is the big get together of the dredging community; meet you there! (Credit: CEDA)
Thursday evening is the big get together of the dredging community; meet you there! (Credit: CEDA)


  1. Countdown to the CEDA Dredging Days 2017, Discover Dredging
  2. CEDA Dredging Days 2019, CEDA
  3. Committees, CEDA
  4. Dredging in Monaco: challenges and solutions, CEDA
  5. CEDA DMC Visits the Anse du Portier Project in Monaco
  6. Next generation marine aggregate dredger as platform for innovation and basis for fleet renewal, CEDA
  7. Effective contract selection: CEDA’s guide to optimised contracting methods, CEDA
  8. Interactive session, CEDA
  9. Why join CEDA?, CEDA

See also

CEDA DMC Presentation On Dredging Innovations In Gdansk

Group photo of delegates attending the combined meeting of CEDA CEC & DMC and MIG on dredging in Baltic Ports. (Credit: CEDA)

Because of other activities these last weeks, my promised post about the DMC presentation had some delay. On October 10th, there was a symposium together with the Marine Institute Gdansk and the CEDA Environmental Commission and the CEDA Dredging Management Commission supported by Gdansk Science and Technology Park and the Baltic Ports Organisation1. The topic of the symposium was ‘Advances in Dredging Technology. My contribution was a presentation as DMC member2 on ‘Dredging technology developments versus requirements’.

Presenting the innovations in dredging technology. (Credit: CEDA)

Although dredging sounds like an old rusty trade, in fact, it is in constant movement and highly innovative when experienced from the inside. At the Dredging Management Commission, we have a separate focus group, that investigates the technological solutions that enable the stakeholders to efficiently manage a dredging project. A lot of ‘booby traps’ in the ‘Checklist For Successful Dredging Management’3 can be handled by applying the right technology. If there are issues with turbidity, e.g. one can apply a component as the ‘Plumigator®’4 attachment for the overflow in a trailing suction hopper dredge to comply with turbidity clauses in the contract. If the project has very narrow allowances for positioning, modern survey and control systems allow surgical precision dredging, to reduce overdredging and corresponding penalties.

All in all, we’ve identified more than 70 innovation over the last ten years, that have found a foothold in the dredging industry. These have been categorised to the field of technology: Components, Equipment, Industries, Initiatives, Methodology, Processes, Systems, Tools. Other descriptions that we’ve attributed to these innovations were their contribution in solving certain problems in dredging management, as they are found in the checklist. And how much effort they require and how much benefit they would yield. These last items are very subjective and still open for debate. More to follow later. But, at least the procedure can be laid out to recommend the best options for tackling certain problems in the ‘checklist.

Fields of technology and contributions to improvements in dredging management. (Credit: CEDA)

We had a good discussion at the symposium about this topic and from the other focus groups (contract management, checklist, etc.). There were also cross-over opportunities with the CEDA Environmental Commission. At least, there are enough leads, that can be used for the next CEDA Dredging Days in Rotterdam.

As an illustration of the long way we’ve came in the dredging industry, the conference room in the control centre of the Port of Gdansk5, was decorated with interesting pictures from the construction of the port.

Historic pictures of dredging works at the construction of the Port of Gdansk.


  1. CEDA-MIG Joint Symposium on Advances in Dredging Technology 2018 Supported by GSTP and BPO, MIG
  2. Dredging Management Commission, CEDA
  3. New CEDA paper encourages all parties to dredging contracts to start thinking and keep thinking, CEDA
  4. Plumigator, IHC
  5. Port of Gdansk

See also

A Visit to the Oresund Link with the CEDA Dredging Management Commission and 23 Years Ago with DOT

The CEDA Dredging Management Commission on site visit at the Oresund Link

Edit (11/08/2018): It appears, that my memory fails me on the details. It must have been late 1996 or early 1997.

This week, there was a meeting of the Dredging Management Commission of the CEDA. In this case, the venue was the offices of Femern A/S in Copenhagen1. The objective of the Dredging Management Commission is to provide expertise and guidelines to successfully manage dredging projects. A first publication was the ‘Checklist for Successful Dredging Management’ introduced at the CEDA Dredging Days last November. Currently I am involved in the Working Group on Innovative Dredging Technology2.
One of the items on the agenda was a visit to the artificial island of Peberholm. This island was reclaimed in 1995 during the Oresund Link Project, a tunnel and bridge connection that links Denmark and Sweden over the Oresund. A massive complex project, involving two countries, multiple contractors and numerous suppliers. Unlike most of the complex international government projects, the Oresund Link was delivered ahead of schedule and within budget3.

View from Peberholm on the Oresund Bridge and Sweden

At the time, I did my graduation thesis project with Skanska, one of the main contractors. There were also two other students working with Skanska. And as there were a lot of other Dutch contractors involved, the student club of Dredging and Offshore Technology organised a study tour to the project and have a first-hand experience with this landmark project. Returning to these sites with the CEDA was interesting to see the final product after it’s been working for several year in use.

Students of Dredging and Offshore Technology on study tour in 1995

On the Swedish side, a bridge was a good solution. On the Danish side, the link would be too close, to Copenhagen International Airport to build a bridge. It would interfere with the flight path of approaching planes. Therefore, a sunken section tunnel was chosen. Peberholm was created with fill material, dredged from this tunnel trench. Digging through hard limestone rock, the cutter suction dredge ‘Castor’4 consumed about 62,000 pick points. In the end, they had to exchange all the teeth every 15 minutes, sometimes too hot to handle.

Cutter head of the CSD ‘Castor’

Each pillar and the two pylons of the bridge have a foundation that reaches to the hard bedrock of the Oresund. For this dredging work, amongst others, the back-hoe dredge ‘Rocky’5 from Skanska was deployed. One of the contractual clauses was that turbidity had to be reduced to an absolute minimum, never seen before in any contract. Although protesting, the contractors complied and did a great job on reducing turbidity. The loose material from the bottom and the rubble from the bedrock created visual plumes anyway and Skanska had to modify their procedures and equipment to reach the stringent standards.

Left, Back hoe dredge ‘Rocky’. Middle, bucket of crushed limestone. Right, Spill plume.

It was fitting, that we visited the location of this impressive project as inspiration to advice how to successfully manage a dredging project. The next step to test the management skills of the Danish people will be the Fehmarn Belt Project6.

Panoramic view from Peberholm. Denmark left, Sweden right and Saltholm in the middle.


  1. Femern A/S
  2. CEDA Dredging Management Commission, CEDA
  3. Oresund on time and within budget, Øresundsbron
  4. Castor, Van Oord
  5. Rocky (after modification), Boskalis
  6. Fehmarn Belt Project, Wikipedia

See also