Lessons learned so far are:
- The depots have been filled in two rounds: a first batch is placed in April 2018, followed by a second batch on top in July 2018 (in most of the compartments). One of the advantages of working in two rounds is the possibility to adjust the volume, for example when expected fill densities are not reached. Consolidation takes place during the two filling rounds resulting in a higher (dry) soil storage volume;
- Ripening of dredged fine sediment mixtures on land does not need to be associated with environmental pollution if sufficient care is taken in the choice of the sediment dredged;
- Transforming marine fine sediment into clay soil requires removal of water and salt, oxidation of organic matter as well as enough time for the relevant processes to occur;
- By tackling multiple goas (investigate estuary quality, improvement, production of geo-technically suitable construction materials, economic stimulation) a diverse group of stakeholders can participate.