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.

Web Map containing Statutory Main River Map, Statutory Main River Map Variations 2022 and Statutory Main River Variations pre 2021 feature layers.Created for use by Web Mapping Application: Main River Map

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)

The statutory main river map is a 1:10,000 scale spatial (polyline) dataset that defines statutory watercourses designated by Natural Resources Wales as main rivers. The data is for Wales only. 'Main rivers' are usually larger streams and rivers, but some of them are small watercourses of significance. They include certain structures that control or regulate the flow of water in, into or out of the channel.

The major river basin lines in NC are drawn based on the nationally recognized hydrologic unit codes (6-digits). Some basins have been split apart due to previously written general statutes. This feature service was uploaded in December 2014. This feature layer can be found in the NC Surface Water Classification map application.

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Rivers included in this map series include: * Albany * Winisk * Severn * Moose * Ekwana * Attawapiskat The maps display gauging systems such as cost share agreement gauges, Water Survey of Canada gauging stations and Meteorological Survey of Canada Climate stations. Dams, their jurisdictional owners and Far North First Nations communities are included.

Mosaic of old river maps in ECW made from old river maps that have been scanned. After this, the leaf edges are removed and the images are georeferenced in RD. After this, a mosaic was made in ECW format for each print, series or revision. In a corresponding index file (shape) you can find out which year each individual card is.

Map of the rivers the Upper Rhine, the Waal, the Merwede, the Oude and part of the Nieuwe Maas from Lobith to Brielle: in twenty sheets in addition to two supplementary sheets for the Dordtsche Kil / manufactured by order of his Excellency the Minister of the Interior, under the direction of the Chief Engineer at the General Service of the Water Management B.H. Goudriaan. - Scale 1:10,000. - [Delft]: General Department of Water Management, 1830-1835. ([Delft] : the Office and the printing works of the Directorate of Military Reconnaissance). - 1 map series, in 27 sheets: lithography; various formats. A number of sheets of the first series of the river map of the Upper Rhine exist with "Normal Lines Gelderland" in handwriting. On these sheets the results of the bank measurements in 1850-1851 and 1872-1873 are written in manuscript. Three additional map sheets are kept with the depositor of this river map, produced in 1863, on which the river positions and emergency levels along the Dutch main rivers are indicated.

The dataset presents 687 rivers associated to 405 Major River Basins.Data was collected within the framework of the BGR-UNESCO "World-wide Hydrogeological Mapping and Assessment Programme" (WHYMAP): www.whymap.org

Digital polygon dataset of Major River Basins of Afghanistan. This dataset is created using 1:1,000,000 scale map of Afghanistan and derived from AIMS, Afghanistan.

Suitable for 1:250,000 scale maps. From NZ Forest Service

The rivers of South and East Asia dataset is derived from the World Wildlife Fund's (WWF) HydroSHEDS drainage direction layer and a stream network layer. The source of the drainage direction layer was the 15-second Digital Elevation Model (DEM) from NASA's Shuttle Radar Topographic Mission (SRTM). The raster stream network was determined by using the HydroSHEDS flow accumulation grid, with a threshold of about 1000 km² upstream area.

The stream network dataset consists of the following information: - the origin node of each arc in the network (FROM_NODE), the destination of each arc in the network (TO_NODE), the Strahler stream order of each arc in the network (STRAHLER), numerical code and name of the major basin that the arc falls within (MAJ_BAS and MAJ_NAME); - area of the major basin in square km that the arc falls within (MAJ_AREA); - numerical code and name of the sub-basin that the arc falls within (SUB_BAS and SUB_NAME); - area of the sub-basin in square km that the arc falls within (SUB_AREA); - numerical code of the sub-basin towards which the sub-basin flows that the arc falls within (TO_SUBBAS) (the codes -888 and -999 have been assigned respectively to internal sub-basins and to sub-basins draining into the sea).

The attributes table now includes a field named "Regime" with tentative classification of perennial ("P") and intermittent ("I") streams.

Supplemental Information:

This dataset is developed as part of a GIS-based information system on water resources for South America. It has been published in the framework of the AQUASTAT - programme of the Land and Water Division of the Food and Agriculture Organization of the United Nations.

Contact points:

Metadata contact: AQUASTAT FAO-UN Land and Water Division

Contact: Jippe Hoogeveen FAO-UN Land and Water Division

Contact: Livia Peiser FAO-UN Land and Water Division

Data lineage:

The linework of the map was obtained by converting the stream network to a feature dataset with the Hydrology toolset in ESRI ArcGIS.The Flow Direction and Stream Order grids were derived from hydrologically corrected elevation data with a resolution of 15 arc-seconds.The elevation dataset was part of a mapping product, HydroSHEDS, developed by the Conservation Science Program of World Wildlife Fund.Original input data had been obtained during NASA's Shuttle Radar Topography Mission (SRTM).

Online resources:

Download - Rivers of South and East Asia (ESRI shapefile)

General information regarding the HydroSHEDS data product

HydroSHEDS dataset download and technical information

Hydrological basins in South and East Asia

This dataset contains locations of major rivers that flow through Allegheny County. These shapes have been taken from the Hydrology dataset. The Ohio River, Monongahela River and Allegheny River are coded as Major Rivers.

Main rivers of the Loir-et-Cher: Loir, Loire, Cher, Saudre

The rivers of South America are derived from the World Wildlife Fund's (WWF) HydroSHEDS drainage direction layer and a stream network layer.The drainage direction layer was created from NASA's Shuttle Radar Topographic Mission (SRTM) 15-second Digital Elevation Model (DEM).The raster stream network was determined by using the HydroSHEDS flow accumulation grid, with a threshold of about 100 km² upstream area.

The stream network dataset consists of the following information: the origin node of each arc in the network (FROM_NODE), the destination of each arc in the network (TO_NODE), the Strahler stream order of each arc in the network (STRAHLER), numerical code and name of the major basin that the arc falls within (MAJ_BAS and MAJ_NAME); - area of the major basin in square km that the arc falls within (MAJ_AREA); - numerical code and name of the sub-basin that the arc falls within (SUB_BAS and SUB_NAME); - area of the sub-basin in square km that the arc falls within (SUB_AREA); - numerical code of the sub-basin towards which the sub-basin flows that the arc falls within (TO_SUBBAS) (the codes -888 and -999 have been assigned respectively to internal sub-basins and to sub-basins draining into the sea). The attributes table now includes a field named "Regime" with tentative classification of perennial ("P") and intermittent ("I") streams.

Supplemental Information:

This dataset is developed as part of a GIS-based information system on water resources for South America. It has been published in the framework of the AQUASTAT - programme of the Land and Water Division of the Food and Agriculture Organization of the United Nations.

Contact points:

Metadata contact: AQUASTAT FAO-UN Land and Water Division

Contact: Jippe Hoogeveen FAO-UN Land and Water Division

Contact: Livia Peiser FAO-UN Land and Water Division

Data lineage:

The linework of the map was obtained by converting the stream network to a feature dataset with the Hydrology toolset in ESRI ArcGIS.The Flow Direction and Stream Order grids were derived from hydrologically corrected elevation data with a resolution of 15 arc-seconds.The elevation dataset was part of a mapping product, HydroSHEDS, developed by the Conservation Science Program of World Wildlife Fund.Original input data had been obtained during NASA's Shuttle Radar Topography Mission (SRTM).

Online resources:

Download - Rivers of South America (ESRI shapefile)

For general information regarding the HydroSHEDS data product

For HydroSHEDS dataset download and technical information

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 Mississippi River is North America’s largest river, flowing over 2,300 miles through America’s heartland to the Gulf of Mexico. The watershed not only provides drinking water, food, industry, and recreation for millions of people, it also hosts a globally significant migratory flyway and home for over 325 bird species. Leading the world in agricultural production, a healthy agricultural sector in the Mississippi River Basin is essential for maintaining the nation’s and the world’s food and fiber supply. USDA Conservation Effects Assessment Project (CEAP) cropland models show that conservation on cropland throughout the entire Mississippi River Basin has reduced nitrogen and sediment loading to the Gulf of Mexico by 28 percent and 45 percent, respectively, over what would be lost without conservation systems in place. With the CCA designation, USDA will build on existing strong partnerships in the basin to accelerate conservation in the 13-state area to continue to reduce nutrient and sediment loading to local and regional water bodies and to improve efficiency in using water supplies, particularly in the southern states. The CCA boundary was identified to harness the partnerships and momentum already established by NRCS’s Mississippi River Basin Healthy Watersheds Initiative (MRBI). With more than 600 partners engaged throughout the initiative area, MRBI has treated over 800,000 acres of agricultural land with systems of practices intended to avoid, control, and trap nutrient and sediment run-off and improve irrigation efficiency. This dataset includes a printer-friendly CCA map and shapefiles for GIS. Resources in this dataset:Resource Title: Mississippi River Basin. File Name: Web Page, url: https://www.nrcs.usda.gov/programs-initiatives/rcpp-regional-conservation-partnership-program/critical-conservation-areas Information about the project and links to a printer-friendly CCA map (PDF, 1.2MB) and shapefiles for GIS (ZIP, 218KB).

Line coverage of major rivers in Florida

The map shows the six major drainage areas in Canada, the major diversions in 1975 and the flow (in cubic metres per second) of rivers whose mean annual flow at the outlet of their river basin exceeds 400 cubic metres per second. The Mackenzie and the St. Lawrence rivers have the two largest annual flows. The world's largest river, the Amazon, has an average discharge of 212,000 cubic metres per second; more than one-sixth of the world's total river discharge. The Congo, second largest, has an average discharge of 39,600 cubic metres per second, less than one-fifth the flow of the Amazon. The largest river in North America, the Mississippi, has an average discharge of 17,300 cubic metres per second. Canada's largest, the St. Lawrence, discharges 10,100 cubic metres per second, at Nicolet; her second largest, the Mackenzie, flows into the Arctic Ocean with a mean annual discharge of 9,910 cubic metres per second. Discharges for the map were estimated at the river mouth or where the river crossed the Canada-United States border. To obtain these estimated discharges, the gauging station closest to the river mouth or the international boundary was used as an estimate of the gauged portion of the river basin. . In some instances, an upstream gauging station was used if better discharge records were available, or if it had a considerably longer period of discharge data.

This dataset is derived from the World Wildlife Fund's (WWF) HydroSHEDS drainage direction layer and a stream network layer. The source of the drainage direction layer was the 15-second Digital Elevation Model (DEM) from NASA's Shuttle Radar Topographic Mission (SRTM). The raster stream network was determined by using the HydroSHEDS flow accumulation grid, with a threshold of about 1000 km² upstream area.

The stream network dataset consists of the following information: the origin node of each arc in the network (FROM_NODE), the destination of each arc in the network (TO_NODE), the Strahler stream order of each arc in the network (STRAHLER), numerical code and name of the major basin that the arc falls within (MAJ_BAS and MAJ_NAME); - area of the major basin in square km that the arc falls within (MAJ_AREA); - numerical code and name of the sub-basin that the arc falls within (SUB_BAS and SUB_NAME); - area of the sub-basin in square km that the arc falls within (SUB_AREA); - numerical code of the sub-basin towards which the sub-basin flows that the arc falls within (TO_SUBBAS) (the codes -888 and -999 have been assigned respectively to internal sub-basins and to sub-basins draining into the sea).

The attributes table now includes a field named "Regime" with tentative classification of perennial ("P") and intermittent ("I") streams.

Contact points:

Metadata contact: AQUASTAT FAO-UN Land and Water Division

Contact: Jippe Hoogeveen FAO-UN Land and Water Division

Contact: Livia Peiser FAO-UN Land and Water Division

Resource constraints:

copyright

Online resources:

Download - Major rivers of the world (ESRI shapefile)

Download - Rivers data documentation (PDF)

General information regarding the HydroSHEDS data product

HydroSHEDS dataset download and technical information