Ground Water Source Protection Zones [Merged]

Source Protection Zones [Merged]
Alternative Title

Dataset Language

Source Protection Zones [Merged] have been created as public facing outlines where common boundaries and overlaps (based on zone number) have been removed.
Source Protection Zones (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 Environment Agency 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. We’ve extended some zones to include areas where there is protective geology cover, such as clay.
This is because activities below the surface, such as deep drilling, could create pathways for pollutants to enter the groundwater. The SPZ maps show them as zones 1c, 2c and 3c. A further Zone 4,
or ‘Zone of Special Interest’ is occasionally defined for some groundwater sources.
These zones highlight areas (mainly on non-aquifers) where known local conditions mean that potentially polluting activities could impact on a groundwater source,
even though the area is outside the normal catchment of that source. Attribution statement: © Environment Agency copyright and/or database right 2016. All rights reserved.
Topic Category

Keyword Value:groundwaterwater
resources management

Originating Controlled Vocabulary: GEMET - INSPIRE Spatial Data Themes (GEMET)
Originating Controlled Vocabulary Citation: 2008-01-01
Temporal Extent

from -1990-01-01 to --
Dataset Reference Date

Date:1990-01-01 -2021-06-18
Date Type: publication

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.
West bounding longitude:-6.236
East bounding longitude:2.072
North bounding latitude:55.816
South bounding latitude:49.943
Vertical Extent

Spatial Reference System

OSGB36 - National Grid of Great Britain
Spatial Resolution

Resource Locator

protocol: DSP:ESRI
name: SourceProtectionZonesMerged_Download
description: Source Protection Zones (Merged) Download
protocol: WMS
name: SourceProtectionZonesMerged_WMS
description: Source Protection Zones (Merged) WMS
protocol: WFS
name: SourceProtectionZonesMerged_WFS
description: Source Protection Zones (Merged) WFS
protocol: WWW:LINK-1.0-http--link
name: Source_Protection_Zones_Merged_ESRI_REST_Endpoint
description: Source Protection Zones (Merged) - ESRI REST Endpoint
RESRI Rest Endpoint
protocol: http:
description: Defra Data Services Platform Customer Forum
Layerfile for use by HCC internal staff: \\Geodata\EnvAgncy\Source_Protection_Zones_50k
Open format | Shapefile (SHP)
Responsible Organisation

Environment Agency
Role: Point of Contact.
Limitations on Public Access

There are no public access constraints to this data. Use of this data is subject to the licence identified.
Use Constraints

Open Government Licence
This data is supplied without guarantee or any warranty as to the accuracy, currency or completeness, and is provided as is, excluding any warranties of any
kind, either express or implied, to the fullest extent permitted by law,including (but not limited to) satisfactory quality or fitness for a particular purpose.
Additional information

Resource Identifier


Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council
as regards interoperability of spatial data sets and services.
Re-designing HCC Data for INSPIRE not done
Equivalent scale

Bounding box
0.76, 0.22, 51.58, 52.10
Quality scope
Spatial representation type

Character encoding
Data quality
Maintenance information
maintenance and update frequency:irregular
update scope:
maintenance note:
Metadata update date
Metadata Language

Metadata Point of Contact

Environment Agency
Resource Type

6 Dataset
File Identifier
Hierarchy level name
Parent identifier
Metadata standard name

Metadata standard version
Review date
Name Long Name Description

OSGB36 National Grid Bounding Coordinates

West: 486000 East: 552000 North: 245000 South: 189000
More Information

Change History