The Vecht waterway in the Netherlands has never been sanitised while it is very important for local ecosystems. Waterboard “Amstel, Gooi en Vecht” contracted Waternet to manage the restoration of the ecosystem in the Vecht.

Over 2000 years of human settlement in the area could be recorded in and on the riverbed, emphasising the need for archaeological assesment of objects that were dredged up. While most of the objects were modern deposits a few very exciting finds were made, including evidence of Roman and Medieval settlements. ADEDE was subcontracted by van der Lee for UXO and archaeology guidance on board their dredging pontoon.


The Vecht on its way to match the quality of nature of its surroundings.


Secure observation post with kill switch. When suspected UXO or heritage is spotted we stop the conveyer belt and dredging process. Our staff will remove the suspect item to ensure the least possible amount of downtime.


German hand grenade found during the Vecht dredging project. We found several items of dumped German ammunition or weaponery.

The orientation and location of the Vecht makes it an ideal place for defensive positions which was recognised by the Germans during WW2. Although no official records exist, soon after the dredging started evidence of dumped weapons and munitions were found, most likely dumped by German soldiers who vacated their positions after the German surrender in 1945. ADEDE provided specialist staff and structural UXO countermeasures to ensure safe and continuous dredging.

Anti-shrapnel measures

To separate areas with risk of explosion we supply and advise on site measures to eliminate the risk of shrapnel injury to staff.

CCTV system

Our high resolution cctv system enables us to observe dredging operations and intervene in case suspect objects emerge.

Armoured digger with pressurised cabin

Our diggers are customised to protect the operator against explosions.