Marine and inland water-based infrastructure is a prerequisite for the sustainable development of economic bene ts and public welfare. Dredging works are needed to realise and maintain such infrastructure. It is widely recognised that such projects create an impact on the environment and in recent years awareness of these impacts has grown – on the client side as well as among contractors.

The purpose of this paper is to share recent experience gained from the development of marine infrastructure projects in environmentally sensitive areas, with a particular focus on the realisation phase. The main emphasis is on lessons learned from 15 years of turbidity monitoring (see Figure 1) during dredging and sediment placement operations.