Groundwater protection map around drinking water sources
Description
The water catchment area around drinking water abstractions from groundwater is the smallest protection area around a groundwater abstraction for drinking water. It is the limit from which the inflowing groundwater has 60 days travel time until extraction. These 60 days travel time through the subsurface count as a minimum travel time to make the water bacteriologically reliable. Within this area, strict requirements apply to the activities that may take place there.
The groundwater protection area is determined by the province and laid down in the Provincial Environmental Ordinance. The area is usually determined on the basis of a calculated residence time of a water particle of 25 years in the aquifer package where the drinking water abstraction takes place.
The 100-year zones and the retreat areas around drinking water extractions give the area within which the groundwater is on its way to the extraction for 100 years or less. This zone can be established by the province for very vulnerable groundwater extractions. It differs per province how this is handled. Depending on the province, rules may apply based on the Provincial Environmental Ordinance (Environmental Management Act) or Spatial Ordinances (Spatial Planning Act) . Spatial stimulus policies are almost always applicable to take into account the importance of drinking water.
The drilling-free zones are set to prevent sealing layers in the subsurface (e.g. clay or loam layers) from being pierced. These layers provide additional protection against the leaching of contaminants to the deeper groundwater intended for drinking water production in vulnerable extractions. In addition to these local drilling-free zones around extractions, a number of regional drilling-free zones are also shown on this map. An example of this is the Central Rift. This area of Horsten and Slenken is protected with a drilling-free zone because of its status as a geological monument.
Resources
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https://data.rivm.nl/geo/alo/wfs?request=GetCapabilities |
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https://data.rivm.nl/geo/alo/wfs?request=GetCapabilities |
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https://data.rivm.nl/geo/alo/wms?request=GetCapabilities |
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https://data.rivm.nl/geo/alo/wms?request=GetCapabilities |
Tags
- grondwaterbeschermingsgebied
- grondwater
- bescherming
- grondwaterbeschermingsgebieden
- grondwaterbescherming
- drinkwater