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Hydrotheek

Record nummer 1856823
Titel artikel Groundwater
Auteur(s) Vries, J.J. de
Titel Geology of the Netherlands
toon extra info.
ed. by Theo E. Wong, Dick A.J. Batjes, Jan de Jager
Auteur(s) Wong, T.E. ; Batjes, D.A.J.
Uitgever Amsterdam : Royal Netherlands Academy of Arts and Sciences
Deel(Jaar)Nummer (2007)
Paginering 295 - 315
Annotatie(s) 17 fig., 64 refs
Online full text
Trefwoorden (cab) grondwater / watervoerende lagen / nederland / hydrogeologie
Rubrieken Geohydrologie, bodemhydrologie
Publicatie type Hoofdstuk uit boek
Taal Engels
Toelichting (Engels) The subsurface of the Netherlands is, from a hydrogeological viewpoint, dominated by a regional aquifer, consisting of medium-grained Plio-Pleistocene fluvial sand with a thickness ranging from 25 to 250 m. The aquifer is at the surface in the eastern half of the country and dips below semi-confining layers of lagoonal clay and peat in the western coastal area. The groundwater table is close to the surface almost everywhere and the precipitation surplus of about 300 mm/a is discharged by a dense and largely artificial drainage system. Most of the western half of the country is below sea level and consists of a patchwork of polders, each with its own artificially controlled level of surface water and groundwater. This has resulted in a complex system of infiltration into relatively elevated polders and in discharge by diffuse upward leakage of fresh and brackish water into deep polders. The eastern half of the country comprises (i) shallow aquifers in level areas, which are drained by seasonally contracting and expanding stream systems, and (ii) deep aquifers in more elevated areas with hardly any surface drainage and a groundwater table that reacts predominantly on annual variations in rainfall. A total volume of the order of 1700 million m3 of fresh groundwater is annually extracted in the Netherlands; about 60% of this is used for public water supply
Betrokken instanties Vrije Universiteit Amsterdam, Faculteit der Aardwetenschappen
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