In tidal dynamic sandy conditions, like most of the Wadden Sea ports, the release of freshwater runoff from the hinterland within the ports is contributing significantly to the maintenance dredging requirements by strengthening sediment import from the sea. The concept of creating estuarine gradients was developed to resolve this issue. It consists of creating bypasses around a port, creating more gradual salinity transitions and accompanying natural variations, whilst at the same time improving fish passage possibilities. These solutions form a win-win situation reducing maintenance dredging and improving the natural quality.