Balance Island

Balance Island reduces salt intrusion in the Haringvliet by creating a smooth transition from salt to fresh water while preserving the unique dynamic character of the delta

Sander van Rooij, Bart van Bueren, Emil Kuijs

Balance Island’s primary function is to decrease the salt intrusion in the Haringvliet. This is achieved by creating a gradual transition from salt to fresh water, while conserving the dynamic nature of a living delta. By reducing the salt-intrusion, it is expected that the ‘Kierbesluit’ can be operated more effectively. The ‘Kierbesluit’ is a measure to stimulate fish migration by frequently opening the sluices of the Haringvlietdam. A lower salt-intrusion allows a more frequent opening of the sluices. This stimulates the migration of fish and retains a minimal salinity near the location Middelharnis, which is recognized as ‘zero effect’ line.

The Haringvliet is a show case of this innovative Dutch Delta Technology for many other estuaries around the world. With the forecast of sea level rise and on-going salinity problems, Balance Island offers a sustainable, simple and easy to maintain solution. Download pdf file.