Home
Search
EA Hydrological Boundaries

EA Hydrological Boundaries

Summary

The Hydrological Areas are a polygon dataset showing 139 hydrological units across England and parts of Wales, that have been defined by the Environment Agency. The units show areas that have broadly similar hydrological characteristics. Many of the hydrological areas are defined by surface water (river) catchments, which are areas of land from which all surface run-off flows through a series of streams, rivers and possibly lakes, to a particular point in the water course such as a river confluence. Other units are defined based on hydrogeological characteristics, where this is more appropriate, such as groundwater recharge areas.

Keywords

Use limitation statement

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

Licence

Open Government Licence

Attribution statement

© Environment Agency copyright and/or database right 2015. All rights reserved. © SEPA. Some features of this information are based on digital spatial data licensed from the Centre for Ecology and Hydrology © NERC (CEH). Contains OS data © Crown copyright [and database right]. Derived in part from 1:50,000 scale BGS Digital Data under Licence 2011/051/F. British Geological Survey © UKRI 2021

Technical information

Update frequency

asNeeded

Lineage

The Hydrological Areas boundaries are based on the following datasets:  WFD cycle 2 river catchments – Open Data spatial format available on data.gov.uk under OGL  WFD cycle 2 transitional – Open Data spatial format available on data.gov.uk under OGL  WFD cycle 2 management catchments – Open Data spatial format available on data.gov.uk under OGL  WFD cycle 2 groundwater – Open Data spatial format available on data.gov.uk under OGL  Statutory main rivers – Open Data spatial format available on data.gov.uk under OGL  CAMS technical boundaries – Open Data spatial format available on data.gov.uk under OGL (https://data.gov.uk/dataset/5a10b765-7eeb-4bdc-a075-70849cb0cc5e/technical-assessment-boundaries-behind-the-abstraction-licensing-strategies-cycle-2)  The SEPA boundary for the Scottish catchment, with approval from SEPA to use this dataset under OGL  BGS 50k solid geology – with approval from British Geological Survey to use this dataset

Spatial information

Coordinate reference system

http://www.opengis.net/def/crs/EPSG/0/27700

Geographic extent

Latitude from: 49.828137 to 55.891398
Longitude from: -6 to 2.100358

Metadata information

Language

English

Metadata identifier

6b54c58a-605e-406e-82c2-20dd78a08905

Published by

Environment Agency

Contact publisher

Defra Data Services Forum

Dataset reference dates

Creation date

15 December 2021

Revision date