Noordplas Polder - Netherlands

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Noordplas Polder drainage area after de Louw et al. 2011, modified



latitude 52°04' N, longitude 04°34' E

Catchment size

37 km²


long-term mean annual precipitation 916 mm
potential evapotranspiration after Makkink 615 mm


The geohydrological situation is characterized by two (semi-) confined aquifers of Pleistocene sands. The upper aquifer is covered by a 6–9 m thick, confining layer of Holocene peat, loam and clay of low permeability. At various locations, the compacted peat and overlying loam and clay deposits have been eroded by streams and tidal channels during the Holocene. The groundwater in the Pleistocene aquifers is brackish to saline and shows an increasing trend of chloride concentrations with depth.


average soil surface level is 5 m below mean sea level

Vegetation/Land use

  • 86% is used for agriculture (arable farming 62%; pasture 24%)
  • 14% is urban area

Context of investigation

  • hydrologic processes including water quality, salinisation and water management


  • Meteorological station dating from 1996 to the present are available
  • Runoff/ Water level monitoring
  • Piezometers
  • Soil moisture

Links to project webpages

other Links

Deltares - Seepage through boils leads to polder salinisation


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