Lleoliadau Parthau Gwarchod Tarddiad (SPZ)
SPZs are defined around large and public potable groundwater abstraction sites. The purpose of SPZs is to provide additional protection to safeguard drinking water quality through constraining the proximity of an activity that may impact upon a drinking water abstraction. This is part of an initial screening process in assessing impacts to groundwater resources.
Zones around location sites are defined by groundwater travel time to an abstraction. This is determined through applying groundwater flow models run at the location of abstractions, inputting parameters such as flow direction, geology type, rainfall and hydrological boundaries. SPZs provide a visual representation of the increased risks as you get closer to the abstraction.
The following subdivisions are defined within SPZs:
Zone 1: (Inner Protection Zone) - This zone is defined by a travel time of 50-days or less from any point within the zone at, or below, the water table. Additionally, the zone has as a minimum a 50-metre radius. It is based principally on biological decay criteria and is designed to protect against the transmission of toxic chemicals and water-borne disease.
Zone 2: (Outer Protection Zone) - This zone is defined by the 400-day travel time from a point below the water table. Additionally this zone has a minimum radius of 250 or 500 metres, depending on the size of the abstraction. The travel time is derived from consideration of the minimum time required to provide delay, dilution and attenuation of slowly degrading pollutants.
Zone 3: (Total catchment) - This zone is defined as the total area needed to support the abstraction or discharge from the protected groundwater source.
A further Zone 4, or ‘Zone of Special Interest’ was previously defined for some groundwater sources. These zones highlighted areas (mainly on non-aquifers) where known local conditions meant that potentially polluting activities could impact on a groundwater source even though the area is outside the normal catchment of that source. In future this zone will be incorporated into one of the other zones (1, 2 or 3), whichever is appropriate in the particular case.
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Dull adnabod
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- NRW_DS121629
- Laith Metadata
- English
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Large potable groundwater abstractions are extracted from the National Abstraction Licence Database (NALD) and georeferenced as Source Protection Locations. A groundwater flow model for relevant aquifer is run and classified into zones defined by travel time. Individual Source Protection Zones are merged and dissolved by Zone number stripping out SPZ name. This is for National Security reasons.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2017-04-01
Ystod amser
- Dyddiad cychwyn
- 2008-01-01
- Dyddiad gorffen
- 2013-01-01
- Categori pwnc
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- Inland waters
Rhychwant
Rhychwant
- Hyd
- Wales (WLS)
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Dosbarthiad
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Geographic Information System
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Geographic Information System
(
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Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
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Large potable groundwater abstractions are extracted from the National Abstraction Licence Database (NALD) and georeferenced as Source Protection Locations. A groundwater flow model for relevant aquifer is run and classified into zones defined by travel time. Individual Source Protection Zones are merged and dissolved by Zone number stripping out SPZ name. This is for National Security reasons.
Allweddeiriau
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Dyfyniad
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- 2008-06-01
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- 2024-06-26
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Gwybodaeth Cynnwys
Proffil CNC
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Cyfyngiadau
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Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
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- 2024-10-23T08:48:36.21Z
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