Dredging of sediments from ports and access channels provides an economic loss to port authorities. Disposal of sediments is often considered to have negative environmental consequences resulting in turbid waters and burial of organisms. At the same time, sediment is becoming an increasingly valuable resource especially in view of accelerating sea level rise. A NbS is using fine-grained dredged sediments as a resource for nature development. Mud, dredged from the ports and shipping channels is disposed at a location where tidal flows transport the material to a nearby intertidal area and salt marsh: a mud engine. The mud engine will serve as a semi-continuous source of sediment. Besides a high biodiversity, salt marshes supply important ecosystem services such as flood protection. Another ecosystem service of a salt marsh is that it acts as a sediment sink. Because less sediment flows back towards the port, it is expected that the dredging costs will reduce.