Groundwater is usually found at shallow depths in the Netherlands, and therefore has effects on ecosystems, crop growth, washout of nutrients and trafficability.
Information about the ground water levels are among others used in:
- The policy on desiccation (Landelijk Steunpunt Verdroging, Taskforce Verdroging(sbestrijding), TOP-gebieden)
- Calculating the damage payments to farmers in water extraction areas (Dienst Landelijk Gebied, Commissie Deskundigen Grondwaterwet)
- Estemating the washout of nitrates to the groundwater (support of the policy on fertilizer usage, Ministerie van EL&I, Directie AKV)
The preperation of projects with a civil technic nature (onderbouwing van het mestbeleid, Ministerie van EL&I, Directie AKV).
The present Gt-information on the holocenic part of the Netherlands is outdated. Because of this the information can no longer be used in the development van enviromental en natural policy, water and soil managment and the organisation of the available space in this part of the Netherlands.
This projects is aiming to be able to have nationwide actual information on the seasonal fluctuation of the ground water levels by the end of 2014. This information is only absent in the holocenic clay and peat areas, excluding the parts of which a recent, detailed soilmap and a Gt-map has been made. With the eye on efficiency authorities have chosen, in consultation with the ministry of El&I, for an actualisation in the holocenic parts of Holland in which as much as possible of the present knowledge and data is used; This means that the original Gt-surfaces of the 1:50.000 soil map will be combined with updated information on ground water levels.