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The Netherlands rely by 60% on groundwater for drinking water supply and 100% in dry periods for irrigation needs (NWP. 2007). Despite this increased reliance of the Dutch water sector to groundwater resources, groundwater bodies were reported to have a good quantitative status in all four Dutch River Basin Management Plans. The country’s main response to decreasing groundwater resources is the recharge of river water in dune infiltration ponds and wells. This measure has been in place for the past 50 years for securing drinking water supply to Amsterdam, The Hague and many other cities (NWP. 2007).

In the water management district "Waterschap Groot Salland" (82,000 ha) located in the Dutch part of the Rhine river basin, the quantitative status of two groundwater bodies was assessed with the use of four tests : water balance, saline intrusion, aquatic ecosystems and terrestrial ecosystems.

In these water bodies are situated two major groundwater dependent terrestrial ecosystems, designated as Natura 2000 sites, the ‘Boetelerveld’ (173 ha) and the ‘Olde Maten and Veerslootlanden’ (993 ha). These natural ecosystems mainly consist of marshland, the development of which is due to the impermeable layers of underground geologic formations that block the drainage and form wet land.

The research on the quantitative status of the two Groundwater bodies led to the following conclusions:

  • In terms of water balance the good status of the Groundwater bodies is not affected because of a surplus of net precipitation.
  • Salt water intrusion in the Groundwater bodies is controlled and thus prevented by permanent ‘early warning’ monitoring systems and therefore does not affect the good status of the Groundwater bodies.
  • The surface water bodies in the Groot Salland district, mainly man made watercourses for purposes of drainage and flood protection, were formed during the 1960s and 1970s and their ecological objectives (MEP/GEP) are determined by the quality of the Rhine water led in during dry periods. Thus, the quality of surface waters in the area is not significantly dependent on the supply of groundwater and so the good status of the Groundwater bodies is not affected.
  • In both groundwater dependent terrestrial ecosystems measures in order to raise the groundwater table have been taken, e.g. the filling of the ditches and the construction of a canal in 2000 with high water level in the Boetelerveld in order to retain more precipitation. It was confirmed that drinking water abstractions elsewhere in the Groundwater bodies did not have an important influence on the groundwater table in these two Natura 2000 areas. Concluding, since 2000, when the WFD came into force, the hydrological conditions in the two areas remain stable and are considered to be sufficient for preserving the two Groundwater bodies in a good status.


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