Central Dredging Association

Understanding dredging

Working Group on setting environmental turbidity limits has started its work

The working group on turbidity limits (WGETL) has started its work. Turbidity limits are often encountered by the dredging industry around the world and often significant resources are used to comply with turbidity limits. It is therefore very important that the imposed turbidity limits are optimized to protect the local environment.

Environmental turbidity limits for dredging operations should always be site-specific, and based on ecosystem functioning, in order to protect sensitive environmental receptors. By setting realistic limits, monitoring can be made more cost-effective and ecologically, and socially, relevant.

The new working group, consists of 13 members representing both contractors, consultants, researchers and contract holders.

Their task will be to prepare a CEDA information paper on guidelines for assessing and evaluating environmental turbidity limits for dredging. The aim of the paper is to facilitate knowledge exchange on how to assess environmental turbidity limits generally, and which parameters should be included in the evaluation at a local level. The paper will also seek to provide support for legislators, and environmental authorities, in setting the right thresholds, and to encourage contractors and consultants to challenge existing limits which are not site-specific or scientifically based. The paper is scheduled for June 2019.

2018-06-WG-Turbidity Limits

WGETL at their first meeting at the CEDA HQ in Delft (l to r) – first row: Lucie Evaux, Van Oord Dredging and Marine Contractors, the Netherlands;  Klavs Bundgaard, SWECO, Denmark; second row: Ives Planke, Port of Antwerp, Belgium;  Jonathan Taylor, HR Wallingford, UK;  Jos de Cubber, Jan De Nul, Belgium;  Johan Henrotte, Royal Boskalis Westminster, the Netherlands; Bastian Schlenz, Femern A/S, Denmark.