Exploration of COASTAR for The Hague-Westland-Rotterdam region begins

COASTAR: saline at bay, fresh on hand

Koen Zuurbier PhD, Klaasjan Raat PhD, Jan Willem Kooiman MSc

  • Start date
    01 Jun 2016
  • End date
    30 Jun 2018
  • Principal
    TKI Watertechnologie
  • collaborating partners
    Arcadis, Deltares, Dunea, Delfland, Evides, LTO-Glaskracht, Provincie Zuid-Holland, Gemeente Westland

Increasing water demand, climate change and rising relative sea-levels all contribute to salinisation in coastal areas, leading to shortages of freshwater for drinking water, agriculture, nature and (urban) water management. This forces us more and more to turn to expensive alternative solutions for water supply, such as desalination (seawater) and the transport of scarce freshwater over long distances. Moreover flooding is also a growing concern.


Because of this set of problems, the business climate in coastal areas is becoming less and less attractive. The use of freshwater surpluses after their temporary storage in the subsurface, and the use of upwelling brackish water, are currently still seen as small-scale initiatives that can only be applied by end-users at a local level. And the linking opportunities for water management are still hardly taken advantage of. This is why COASTAR (COastal Aquifer STorage and Recovery) was created: an action perspective for a robust freshwater supply through the large-scale, organised use of the subsurface for the storage and supply of freshwater, with benefits for the management of the entire water system.


We will begin this TKI project by systematically and critically researching and developing COASTAR. Besides directing attention to the subsurface and techniques, we will focus sharply on the costs and benefits, financing and organisation. The targeted result is a Master Plan for a COASTAR implementation programme for the region of The Hague-Westland-Rotterdam. This Master Plan will serve as a model for other areas in the Netherlands and coastal areas worldwide.


The ultimate goal of this TKI project is the recognition of COASTAR as an adaptation strategy by the regional and national authorities. To make it possible to strike the right balance between COASTAR and other freshwater supply options in low-lying areas of the Netherlands, the links between COASTAR and ongoing government programmes, such as the Delta Programme, will be actively established.

ASR Prominent: ‘Freshwater supply in Westland greenhouse horticulture: one of the components of COASTAR’.



Video – 04:01
COASTAR: Zout op afstand, zoet op voorraad