Statutory Main Rivers Map is a spatial (polyline) dataset that defines statutory watercourses in England designated as Main Rivers by the Environment Agency.

Watercourses designated as ‘main river’ are generally the larger arterial watercourses. The Environment Agency has permissive powers, but not a duty, to carry out maintenance, improvement or construction work on designated main rivers.

All other open water courses in England are determined by statute as an ‘ordinary watercourse’. On these watercourses the Lead Local flood Authority or, if within an Internal Drainage District, the Internal Drainage Board have similar permissive powers to maintain and improve.

The Statutory Main River Map Variations dataset defines proposed changes to the Statutory Main River Map.

Statutory Main Rivers Map defines statutory watercourses in England designated as Main Rivers by Environment Agency.

Watercourses designated as ‘main river’ are generally the larger arterial watercourses. The Environment Agency has permissive powers, but not a duty, to carry out maintenance, improvement or construction work on designated main rivers.

All other open water courses in England are determined by statute as an ‘ordinary watercourse’. On these watercourses the Lead Local flood Authority or, if within an Internal Drainage District, the Internal Drainage Board have similar permissive powers to maintain and improve.

The Environment Agency notifies the public and interested parties of our intentions to make a change to the statutory main river map and decides which watercourses are designated as Main Rivers following a legal process to determine and publish changes.

The change, or variation, to the Statutory Main River Map is either a deletion (also known as a demainment) or an addition (also known as an enmainment).

There are two reasons for a change to the Statutory Main River Map - Designation and Factual.

Designation changes are required when we make a decision to lengthen or shorten the section of a river designated as a 'main river'. These changes will determine which risk management authority may carry out maintenance, improvement or construction work on the watercourse. These changes result also in differing legislation applying to the riparian owner and others with an interest.

Factual changes may be required to update the map to represent the real position of the watercourse. They do not involve any changes of authority or management. Typical examples of factual changes are when: a watercourse has changed course naturally, a watercourse has been diverted or a survey of a culvert shows a different alignment.

A change to the Statutory Main River Map goes through the following stages (identified as Status within the data):

• Draft
• Consultation
• Pending Determination
• Determination
• Appeals
• Pending Appeals
• Pending Implementation
• Implemented (Month and Year)

Data shows the location of Priority Habitat Chalk rivers and Streams. Replaces the existing 1:50,000 scale data.Based on Environment Agency Detailed River Network (DRN) version 3. All fields from DRN have been retained. This subset of chalk rivers uses the old 1:50,000 Biodiversity Action Plan (BAP) chalk river data, BGS geology, WWF report "The State of England’s Chalk Streams" and stakeholder knowledge to produce an updated chalk river network for England.Full metadata can be viewed on data.gov.uk (to follow).

Watercourses which have been designated as ‘main’ are generally the larger arterial watercourses. The Environment Agency has permissive powers, but not a duty, to carry out maintenance, improvement or construction work on designated main rivers.

The objective of the priority habitat map in England is to:• help organisations protect the most natural remaining examples of rivers from further impacts on natural processes, and • highlight any aspects of habitat integrity (hydrological, chemical, physical, biological) that could most usefully be improved. The priority river habitat map that has been produced is an English interpretation of the UK definition of priority river habitat, focusing on naturalness as the principal criterion in recognition of the vital importance of natural processes in delivering sustainable riverine habitats and supporting characteristic biodiversity.Full metadata can be viewed on data.gov.uk.

"One of the two datasets that make up the Priority River Habitat Map. Consists of rivers and streams that exhibit a high degree of naturalness. The naturalness classification used to map priority river habitat is based on recent work to review the river SSSI series. It evaluates four main components of habitat integrity: hydrological, physical, physico-chemical (water quality) and biological. An additional classification of the naturalness of headwaters (defined as streams with a catchment area of <10km2 to coincide with WFD typology boundaries) uses land cover data as a surrogate for direct information on river habitat condition (information which is generally lacking on headwaters). Streams and rivers operating under natural processes, free from anthropogenic impact and with a characteristic and dynamic mosaic of small-scale habitats that supports characteristic species assemblages (including priority species), are the best and most sustainable expression of river ecosystems. Key elements are: a natural flow regime; natural nutrient and sediment delivery regimes; minimal physical modifications to the channel, banks and riparian zone; natural longitudinal and lateral hydrological and biological connectivity; an absence of non-native species; low intensity fishery activities. These conditions provide the best defence against climate change, maximising the ability of riverine ecosystems to adapt to changing conditions. They also provide the most valuable and effective transitional links with other priority habitats, including lakes, mires and coastal habitats. In English rivers and streams, high levels of naturalness are rare. "

The Flood Map for Planning (Rivers and Sea) includes several layers of information. This layer and documentation covers Flood Zone 2. It is the Environment Agency's best estimate of the areas of land at risk of flooding, when he presence of flood defences are ignored and covers land between Zone 3 and the extent of the flooding from rivers or the sea with a 1 in 1000 (0.1%) chance of flooding each year. This dataset also includes those areas defined in Flood Zone 3.This dataset is designed to support flood risk assessments in line with Planning Practice Guidance ; and raise awareness of the likelihood of flooding to encourage people living and working in areas prone to flooding to find out more and take appropriate action. This dataset is republished by the West of England Combined Authority for supplementing information within our Local Nature Recovery Strategy. If you are using it for statutory purposes, you should refer to the Environment Agency's canonical version, linked in the Attributions field below as this is likely to be more current.

Two subsets of data derived from national data sets collected by the Environment Agency and Natural Resources Wales (© Environment Agency copyright and database right 2023; Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved) which were supplied under the Open Government Licence https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ The full data sets can be accessed from the Environment Agency's Ecology and Fish Data Explorer (https://environment.data.gov.uk/ecology/explorer/) and NBNAtlas for Natural Resources Wales data (https://registry.nbnatlas.org/public/show/dr2116).Data set 1: england_wales_t1_t2_t3.csvData set for creating maps of macroinvertebrate communities across England and Wales at three time points. Data comprise 13921 rows and seven columns:time = time period when data were collected: t1 = 1991-3, t2 = 2004-6, t3 = 2017-19site = site code, prefixed with 'S'.easting = x-coordinate of each site on the British National Gridnorthing = y-coordinates of each site on the British National GridYear = year the sample was collectedrichness = number of macroinvertebrate families present in the sampleca1.score = measure of macroinvertebrate community composition. Larger values indicate that a higher proportion of pollution-sensitive taxa are present.Data set 2: england_wales_SEM_GWR.csv Data set for running structural equation modelling and geographically-weighted regression analyses to explain macroinvertebrate community composition across England and Wales. Data comprise 3632 rows and 15 columns:Column 1: site = site code, prefixed with 'S'.Columns 2-3 (easting and northing) = x- and y-coordinates of each site on the British National GridColumn 4: year = year the macroinvertebrate sample was collectedColumns 5-9 (pH, temperature, BOD, nitrate, phosphate) are median values in the 12 months prior to an invertebrate sample for: pH, water temperature (degrees Celsius), biochemical oxygen demand (mg l-1), nitrate (mg l-1) and orthophosphate (mg l-1)Columns 10-12 (arable, imp.grass, urban) represent the percentage of the river's catchment covered by three different land cover types (arable agriculture, improved grassland, urban)Column 13 (scaled.med.discharge) is the annual median discharge at a site, divided by the catchment area; units = m3 s-1 km-2)Column 14: richness = number of macroinvertebrate families present in the sampleColumn 15: ca1.score = measure of macroinvertebrate community composition. Larger values indicate that a higher proportion of pollution-sensitive taxa are present.Research results based upon these data are published at https://doi.org/10.1016/j.scitotenv.2024.174369

Location of manmade barriers, mostly weirs, and natural features, such as waterfalls, on river courses in England and Wales. This dataset is known as 'Potential Sites of Hydropower Opportunity' and has been created under the EA project 'Opportunity and environmental sensitivity mapping for hydropower in England and Wales'. The dataset shows the location of opportunities for hydropower and the basic environmental sensitivity, which considers the presence of fish species and whether the site has been designated as Special Area of Conservation (SAC), associated with exploiting them. Besides their location, the dataset includes information on river level height, up and downstream the barrier.

Large-scale, accurate and fully attributed digital river centreline covering England and Wales. The dataset has full-feature network geometry cross-referenced with OS MasterMap following Digital National Framework principles. The dataset has full-feature network geometry cross-referenced with OS MasterMap following Digital National Framework. It is made of the three following layers: - Links: lines representing the river network. It is a river centreline dataset, based on OS MasterMap for surface features and Environment Agency culvert surveys for underground features (where available). There are many attributes associated with this dataset to enable it to be used for many different business purposes. It is topologically correct to allow it's use in network tracing tasks. - Offline Drainage: lines representing the sections of river and drains that do not obviously connect to the main online drainage network represented by the DRN. Sections with uncertain flow direction and connectivity are presented here, although in reality some may connect to the main DRN, and be added to it as more information becomes available. - Nodes: points representing the junctions between discrete stretches of the online DRN. It is used to assist in connectivity and flow direction, as every DRN stretch is attributed with the 'from' and 'to' nodes. Nodes are also included where line features cross, but do not intersect, such as an aqueduct passing over a river. Nodes have types to determine whether they are at for example junction or at a change in river type.

The Historic Flood Map is a GIS layer showing the maximum extent of individual Recorded Flood Outlines from river, the sea and groundwater springs that meet a set criteria. It shows areas of land that have previously been subject to flooding in England. This excludes flooding from surface water, except in areas where it is impossible to determine whether the source is fluvial or surface water but the dominant source is fluvial.

The majority of records began in 1946 when predecessor bodies to the Environment Agency started collecting detailed information about flooding incidents, although we hold limited details about flooding incidents prior to this date.

If an area is not covered by the Historic Flood Map it does not mean that the area has never flooded, only that we do not currently have records of flooding in this area that meet the criteria for inclusion. It is also possible that the pattern of flooding in this area has changed and that this area would now flood or not flood under different circumstances. Outlines that don’t meet this criteria are stored in the Recorded Flood Outlines dataset.

The Historic Flood Map takes into account the presence of defences, structures, and other infrastructure where they existed at the time of flooding. It will include flood extents that may have been affected by overtopping, breaches or blockages.

Flooding is shown to the land and does not necessarily indicate that properties were flooded internally.

One of the two datasets that make up the Priority River Habitat Map. Under the UK BAP definition all headwaters potentially form part of the priority habitat definition. The headwater resource can be a significant proportion of the river habitat network, accounting for the large majority of total river length. The headwater areas selected as most natural by land cover comprise a relatively large proportion of the upland headwater resource but a very small proportion of the lowland resource. The headwater analysis is the least certain component of the naturalness analysis – for example, highly natural headwater streams running through very small catchment areas, often wooded, would not be detectable by the analysis that has been undertaken. Equally, land cover is a crude measure of naturalness and various types of impact on river habitat are not well correlated with it (e.g. abstraction pressure, point source pollution). These issues can only be addressed through local interpretation of the final priority habitat map. Attribution statement: © Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right [year].

PLEASE NOTE: This dataset has now been retired. It was last updated on 02/11/2022 and has been replaced by the Spatial Flood Defences (inc. standardised attributes) dataset. This is a more comprehensive dataset of assets, comes with attribution and is updated daily. See: https://environment.data.gov.uk/dataset/8e5be50f-d465-11e4-ba9a-f0def148f590

The Flood Map for Planning (Rivers and Sea) shows the areas across England that could be affected by flooding from rivers or the sea. It also shows flood defences and the areas that benefit from them.

The Flood Map is designed to raise awareness among the public local authorities and other organisations of the likelihood of flooding and to encourage people living and working in areas prone to flooding to find out more and take appropriate action.

The Flood Map includes several layers of information, this dataset is: Spatial Flood Defences (without standardised attributes), which shows those defences constructed which have a standard of protection equal to or better than 1 in 100 (1%) for rivers and 1 in 200 (0.5%) from the sea. (Some additional defences are also shown). Attribution Statement: © Environment Agency copyright and/or database right 2018. All rights reserved.Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown copyright and database rights 2018 Ordnance Survey 100024198

🇬🇧 영국 English This is the record for Rivers which forms a part of the Habitat Networks (Individual) (England) dataset (link below). The habitat network maps seek to apply the best evidence and principles and to use the best available nationally consistent spatial data. The habitat network maps are developed around 4 distinct habitat components sets and include 4 distinct network zones where action may be undertaken to build greater ecological resilience. The different elements of the maps are described below: Habitat Components; • The location of existing patches of a specific habitat for which the network is developed. This is termed the ‘Primary habitat’ e.g. lowland heathland. The main baseline data used for this is the Priority Habitat Inventories (PHIv2.2). • The location of additional habitat that naturally form mosaics with the primary habitat e.g. habitats that are most likely to form ecological mosaics possibly used by species associated with the primary habitat. This is termed the ‘Associated habitat’. The main baseline data used for this is the Priority Habitat Inventories (PHIv2.2). • The locations where habitat creation or restoration is known to occur, this is primarily sites under relevant agri-environment options. This is termed the ‘Habitat creation’ • Sites where data suggests small fragments of the primary habitat or degraded habitat exists and where restoration may be possible, this is primarily developed from information held within the current PHI v2.2. This is termed the ‘Restorable habitat’. Network Zones; • Land within close proximity to the existing habitat components that are more likely to be suitable for habitat re-creation for the particular habitat. These areas are primarily based on soils but in many cases has been refined by also using other data such as hydrology, altitude and proximity to the coast. This is termed the ‘Network Enhancement Zone 1’. • Land within close proximity to the existing habitat components that are unlikely to be suitable for habitat re-creation but where other types of habitat may be created or land management may be enhanced including delivery of suitable Green Infrastructure. This is termed the ‘Network Enhancement Zone 2’. • Land immediately adjoining existing habitat patches that are small or have excessive edge to area ratio where habitat creation is likely to help reduce the effects of habitat fragmentation. This is termed the ‘Fragmentation Action Zone’. • Land within relatively close proximity to the Network Enhancement Zones 1 & 2 that are more likely to be suitable for habitat creation for the particular habitat and identifying possible locations for connecting and linking up networks across a landscape. This is termed the ‘Network Expansion Zone’. Note: For some habitat networks not all of the habitat components or all the action zones are identified either because the data does not exist or the habitat does not lend itself to identifying particular types of action. Further details are outlined in the Habitat Network Mapping Guidance document. The Network boundary is drawn around the 4 habitat components using a variable buffering process with a generalised distance of 500m although 1km was used for Blanket Bog. As the boundary for each habitat network is tightly drawn around the existing patches of habitat this means that at a national scale the habitat network is composed of a series of smaller ‘networks’ that encapsulates one or more clusters of existing habitat patches. These may be considered as ‘network segments’. The Network Expansion Zone has been drawn around these segments to identify areas where additional action may be undertaken to build greater ecological resilience across the wider landscape. Attribution statement: © Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right [year].

Riparian Shade data from the Environment Agency. Shows relative shading of rivers and streams by vegetation and topography. Areas with least shade are ideal areas for tree planting to provide a benefit to freshwater ecology.Tile Map Service showing national coverage down to sub-catchment scale (ca. 1:18,000)For larger scales, add in the Riparian Shade Detail layer to your map and swap the visible range over at Neighbourhood scale.

1. Basic data at river water quality monitoring points set by the Environmental Department; including station name, river basin, station coordinates, and more. 2. Station location map layer, packaged as a SHP layer in a zip file, including DBF, SHP, SHX, and other geographic data, for GIS mapping.

The global river flood hazard maps are a gridded data set representing inundation along the river network, for seven different flood return periods (from 1-in-10-years to 1-in-500-years). The input river flow data for the new maps are produced by means of the open-source hydrological model LISFLOOD, while inundation simulations are performed with the hydrodynamic model LISFLOOD-FP. The extent comprises the entire world with the exception of Greenland and Antarctica and small islands with river basins smaller than 500 km^2. Cell values indicate water depth (in meters). The maps can be used to assess the exposure of population and economic assets to river floods, and to perform flood risk assessments. The dataset is created as part of the Copernicus Emergency Management Service. Note: This dataset may have missing tiles. This collection will be eventually be replaced by v2.1 once it's updated by the provider.

These are the Bathing Waters Zones of Influence (ZOI) Catchments from the Environment Agency's Spatial Data Catalogue. We have downloaded them, symbolised them and published as a feature layer.Bathing water zones of influence (ZOI) are defined as an area where if heavy rainfall occurs may lead to surface water runoff causing a reduction in water quality at a designated bathing water. These Bathing waters are often impacted by either surface water or streams & rivers. Not all bathing waters have zones of influence, very small catchments or run off areas have not been defined. They were originally designed to be presented on PDF maps for use in bathing water profiles as per the bathing water directive 2006/7/EC in 2012 and therefore of low resolution. The polygons were derived from a range of sources from digital elevation models to being manually digitised. They are annual updated with any changes to the designated bathing water inventory.Updated in April 2024Find out more at environment.data.gov.uk.

These are the Bathing Waters Zones of Influence (ZOI) Catchments from the Environment Agency's Spatial Data Catalogue. We have downloaded them, symbolised them and published as a feature layer.Bathing water zones of influence (ZOI) are defined as an area where if heavy rainfall occurs may lead to surface water runoff causing a reduction in water quality at a designated bathing water. These Bathing waters are often impacted by either surface water or streams & rivers. Not all bathing waters have zones of influence, very small catchments or run off areas have not been defined. They were originally designed to be presented on PDF maps for use in bathing water profiles as per the bathing water directive 2006/7/EC in 2012 and therefore of low resolution. The polygons were derived from a range of sources from digital elevation models to being manually digitised. They are annual updated with any changes to the designated bathing water inventory.Find out more at environment.data.gov.uk.This layer has been replaced with a layer containing the latest data here: Bathing Water Catchments (England)

HydroSHEDS is a mapping product that provides hydrographic information for regional and global-scale applications in a consistent format. It offers a suite of geo-referenced datasets (vector and raster) at various scales, including river networks, watershed boundaries, drainage directions, and flow accumulations. HydroSHEDS is based on elevation data obtained in 2000 by NASA's Shuttle Radar Topography Mission (SRTM). This dataset provides polylines that represent river networks, derived from and consistent with other HydroSHEDS datasets. These data are based on 15 arc-seconds (approx. 500 m at the equator) resolution raster data. Mapping the world's free-flowing rivers: data set and technical documentation Note that the quality of the HydroSHEDS data is significantly lower for regions above 60 degrees northern latitude as there is no underlying SRTM elevation data available and thus a coarser-resolution DEM was (HYDRO1k provided by USGS). HydroSHEDS was developed by the World Wildlife Fund (WWF) Conservation Science Program in partnership with the U.S. Geological Survey, the International Centre for Tropical Agriculture, The Nature Conservancy, and the Center for Environmental Systems Research of the University of Kassel, Germany.