Source Protection Zones (SPZ) Merged
AfA029 Source Protection Zones [Merged]
Parthau Diogelu Tarddiad Dŵr Cyfunedig
Source Protection Zones [Merged] have been created as public facing boundaries where individual groundwater bodies within Source Protection Zones (SPZ) have been dissolved so only the outer boundaries are shown. 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.
dataset
https://datamap.gov.wales/layers/inspire-nrw:NRW_Source_Protection_Zones
name: Download Data and Web services
name: Web Mapping Services
116230
https://naturalresources.wales
eng
OGP
urn:ogc:def:crs:EPSG::OSGB36
inlandWaters
Area management/restriction/regulation zones and reporting units
publication
2023-05-27
-5.77774100
-2.60886500
53.51306700
51.24082900
publication
2023-05-27
Wales (WLS)
2008-01-01
2023-03-16
publication
2023-03-16
asNeeded
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 sl owly 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. Large potable groundwater abstractions site are georeferenced as Source Protection Locations. A groundwater flow model for relevant aq uifer 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.
© CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Natural Resources Wales (NRW)
0300 065 3000
enquiries@naturalresourceswales.gov.uk
owner
Natural Resources Wales (NRW)
0300 065 3000
enquiries@naturalresourceswales.gov.uk
originator
Natural Resources Wales (NRW)
0300 065 3000
enquiries@naturalresourceswales.gov.uk
pointOfContact
2023-05-26