Polygon layer representing HUC 10 classification watersheds in Virginia.

This data is the latest (Version 6) national hydrologic unit (HU) boundaries at levels 1-6 for Virginia developed and maintained by the Virginia Department of Conservation and Recreation. They have been created in compliance with the most recent published federal standards for delineation of hydrologic units and contain national WBD HU model changes made since that time up to the publication date. The Virginia NWBD schemas include variations from the national WBD schemas. This dataset covers the whole state and is seamless with the WBD products of surrounding states at the time of publication and was developed as part of a seamless hydrologic unit product for the nation at the sixth level to be used for more detailed watershed planning work in the state. This becomes the official statewide sixth level hydrologic unit delineation for Virginia.

HUC 10 watersheds in Hampton Roads - from USGS

Educational story map for teaching sixth graders about watersheds and water quality.

Watersheds within Fairfax County. There are 30 watersheds delineated across Fairfax County.

Information on water depth in river channels is important for a number of applications in water resource management but can be difficult to obtain via conventional field methods, particularly over large spatial extents and with the kind of frequency and regularity required to support monitoring programs. Remote sensing methods could provide a viable alternative means of mapping river bathymetry (i.e., water depth). The purpose of this study was to develop and test new, spectrally based techniques for estimating water depth from satellite image data. More specifically, a neural network-based temporal ensembling approach was evaluated in comparison to several other neural network depth retrieval (NNDR) algorithms. These methods are described in a manuscript titled "Neural Network-Based Temporal Ensembling of Water Depth Estimates Derived from SuperDove Images" and the purpose of this data release is to make available the depth maps produced using these techniques. The images used as ...

The Virginia Scenic Rivers Program was enabled by the Virginia Scenic Rivers Act of 1970. Within Loudoun County are two Virginia-designated scenic rivers - Catoctin Creek from Waterford to the confluence of the Potomac, and Goose Creek from the confluence of the north and south prongs near Linden to the confluence of the Potomac. These creeks are represented in the Loudoun County GIS using the base map drainage data, which is collected via a planimetric update process from aerial photography and processed for a cartographic representation at 1:2400 Scale, and are mapped to National Map Accuracy Standards (NMAS). As the designation is to the main trunk of each stream, tributaries were removed and the centerlines were dissolved by name.Updated - 2016Additional Information:Scenic Rivers Act - Catoctin Creek State Scenic RiverScenic Rivers Act - Goose Creek State Scenic RiverIf you would like more information or would like to get involved please contact the following:Catoctin Creek Scenic River Advisory CommitteeGoose Creek Scenic River Advisory Committee

This preliminary experimental lithogeochemical map shows the distribution of rock types in the Virginia and Maryland parts of the Chesapeake Bay watershed. The map was produced digitally by classifying geologic-map units according to composition, mineralogy, and texture; rather than by age and stratigraphic relationships as shown on traditional geologic maps. This map differs from most lithologic maps in that the lithogeochemical unit classification distinguishes those rock units having key water-reactive minerals that may induce acid neutralization, or reduction, of hosted water at the weathering interface. The validity of these rock units, however, is independent of water chemistry, because the rock units are derived from geologic maps and rock descriptions. Areas of high soil carbon content, and sulfide metal deposits are also shown. Water-reactive minerals and their weathering reactions yield five lithogeochemical unit classes: 1) carbonate rock and calcareous rocks and sediments, the most acid-neutralizing; 2)carbonaceous-sulfidic rocks and sediments, oxygen-depleting and reducing; 3) quartzofeldspathic rocks and siliciclastic sediments, relatively weakly reactive with water; 4) mafic silicate rocks/sediments, oxygen consuming and high solute-load delivering; and, 5) the rarer calcareous-sulfidic (carbonaceous) rocks, neutralizing and reducing. Earlier studies in some parts of the map area have related solute loads in ground and stream waters to some aspects of bedrock lithology. More recent preliminary tests of relationships between four of the classes of mapped lithogeochemical units and ground water chemistry, in the Mid-Atlantic area using this map, have focused on and verified the nitrate-reducing and acid-neutralizing properties of some bedrock and unconsolidated aquifer rock types. Sulfide mineral deposits and their mine-tailings effects on waters are beginning to be studied by others. Additional testing of relationships among the lithogeochemical units and aspects of ground and surface water chemistry could help to refine the lithogeochemical classification, and this map. The testing could also improve the usefulness of the map for assessing aquifer reactivity and the transport properties of reactive contaminants such as acid rain, and nitrate from agricultural sources, in the Chesapeake Bay watershed.

This map shows high-resolution (1 meter) land cover in the EPA Region 3, covering the parts of West Virginia, Virginia, and Pennsylvania outside of the Chesapeake Bay Watershed. It contains the following classes: Water, Tree Canopy, Scrub\Shrub, Low Vegetation, Barren, Impervious Structures, Other Impervious, Impervious Roads, Tree Canopy Over Impervious Structures, Tree Canopy Over Other Impervious, and Tree Canopy Over Impervious Roads. Using object-based image analysis mapping techniques, it was mapped from a combination of remote-sensing imagery and GIS datasets, including LiDAR, multispectral imagery, and thematic layers (e.g., roads, building footprints). Draft output was then manually reviewed and edited to eliminate obvious errors of omission and commission. The classification scheme closely follows a similar mapping effort for the Chesapeake Bay Watershed; together, maps from the two projects cover the entirety of the EPA Region 3 states. One difference between the projects, however, is that tidal wetlands were mapped in the Chesapeake Bay effort, included as the class Emergent Wetlands, but not in the EPA Region 3 zones outside of the watershed. The map is considered current as of 2020 for West Virginia, 2021 for Virginia, and 2022 for Pennsylvania.

This datasets contain GIS files related to the hydrology and watersheds of Accomack and Northampton Counties on the Eastern Shore of Virginia. Data include named and unnamed water bodies, rivers and streams (both center flowlines and area polygons showing bank-full width for larger features), wetlands and marshes, and shorelines. A static (2013-09-06) copy of the full USGS "National Hydrography Dataset (NHD) - High Resolution - Virginia" state-extracted dataset in original ESRI file-geodatabase format, downloaded on 2014-02-21 from nhd.usgs.gov, is included. For users who may not be able to read or make use of data in ESRI proprietary geodatabase formats, shapefiles of geographic feature classes contained within the HUC8 subbasins spanning Accomack and Northampton Counties (partly or wholly) are also provided. Note that the stream network nodal topology, which can be used to evaluate and analyze flow paths as part of a fully-functional hydrological network with GIS tools such as Arc Hydro and Network Analyst, are only available within the ESRI file-geodatabase file. The primary purpose of this dataset is to provide VCRLTER researchers and students with a convenient up-to-date set of GIS data layers in one location that can be used as base layers for various map products and for conducting research activities. A secondary purpose of this dataset is to extend hydrologic data coverage in the VCRLTER data catalog to include Accomack County and to supersede older USGS DLG data contained in the Northampton County GIS data package (VCRLTER dataset VCR14219).

This datasets contain GIS files related to the hydrology and watersheds of Accomack and Northampton Counties on the Eastern Shore of Virginia. Data include named and unnamed water bodies, rivers and streams (both center flowlines and area polygons showing bank-full width for larger features), wetlands and marshes, and shorelines. A static (2013-09-06) copy of the full USGS "National Hydrography Dataset (NHD) - High Resolution - Virginia" state-extracted dataset in original ESRI file-geodatabase format, downloaded on 2014-02-21 from nhd.usgs.gov, is included. For users who may not be able to read or make use of data in ESRI proprietary geodatabase formats, shapefiles of geographic feature classes contained within the HUC8 subbasins spanning Accomack and Northampton Counties (partly or wholly) are also provided. Note that the stream network nodal topology, which can be used to evaluate and analyze flow paths as part of a fully-functional hydrological network with GIS tools such as Arc Hydro and Network Analyst, are only available within the ESRI file-geodatabase file. The primary purpose of this dataset is to provide VCRLTER researchers and students with a convenient up-to-date set of GIS data layers in one location that can be used as base layers for various map products and for conducting research activities. A secondary purpose of this dataset is to extend hydrologic data coverage in the VCRLTER data catalog to include Accomack County and to supersede older USGS DLG data contained in the Northampton County GIS data package (VCRLTER dataset VCR14219).

Gray-scale map showing the general geology of the Danville-Dan River basin at a scale of 1:125,000 overlain with red lines contouring the simple Bouguer gravity anomaly calculated from 1,814 gravity observations. Contour interval is 1.0 milligal. For more information on this resource or to download the map PDF, please see the links provided.

description: The Drainage_Basin polygon feature class was created as a digital representation of drainage basins for more than 1,650 continuous-record streamflow-gaging stations, partial record streamflow-gaging stations of the U.S. Geological Survey (USGS), and other watercourse locations of interest. The Drainage_Basin polygon feature class replaces the drainage basins previously derived through planimetric methods on paper maps, and provides a digital representation that previously was unavailable. The dataset will be used for the update and publication of drainage areas to all USGS stations in Virginia. This dataset represents historical flow patterns and avoids anthropogenic changes to flow when possible. The Drainage_Basin polygon feature class has a unique format with cascading, or stacked, polygons. In a coverage format, to calculate the drainage area of a large basin containing multiple sub-basins, the area from multiple polygons would be summed. However, within the Drainage_Basin polygon feature class, one polygon is used to store the entire drainage area to each USGS station. Because geodatabases and shapefiles are able to store multiple copies of the same geometry, the Drainage_Basin polygon feature class can hold polygons that are stacked. During the digitizing and editing phases topology rules were utilized to ensure that stacked linework was identical. Each polygon in Drainage_Basin has a value within the Station_number field. Most values represent USGS station number found in the National Water Information System (NWIS) database http://waterdata.usgs.gov/nwis. The station locations stored within NWIS represent the locations of monitoring equipment maintained by the USGS. During the delineation process, these locations were used as reference points to the downstream end of a drainage basin, but usually were not the outlet point. For this reason, the point locations are not contained in this dataset. Most are available through NWIS by searching for the station number.; abstract: The Drainage_Basin polygon feature class was created as a digital representation of drainage basins for more than 1,650 continuous-record streamflow-gaging stations, partial record streamflow-gaging stations of the U.S. Geological Survey (USGS), and other watercourse locations of interest. The Drainage_Basin polygon feature class replaces the drainage basins previously derived through planimetric methods on paper maps, and provides a digital representation that previously was unavailable. The dataset will be used for the update and publication of drainage areas to all USGS stations in Virginia. This dataset represents historical flow patterns and avoids anthropogenic changes to flow when possible. The Drainage_Basin polygon feature class has a unique format with cascading, or stacked, polygons. In a coverage format, to calculate the drainage area of a large basin containing multiple sub-basins, the area from multiple polygons would be summed. However, within the Drainage_Basin polygon feature class, one polygon is used to store the entire drainage area to each USGS station. Because geodatabases and shapefiles are able to store multiple copies of the same geometry, the Drainage_Basin polygon feature class can hold polygons that are stacked. During the digitizing and editing phases topology rules were utilized to ensure that stacked linework was identical. Each polygon in Drainage_Basin has a value within the Station_number field. Most values represent USGS station number found in the National Water Information System (NWIS) database http://waterdata.usgs.gov/nwis. The station locations stored within NWIS represent the locations of monitoring equipment maintained by the USGS. During the delineation process, these locations were used as reference points to the downstream end of a drainage basin, but usually were not the outlet point. For this reason, the point locations are not contained in this dataset. Most are available through NWIS by searching for the station number.

This polygon shapefile shows the rivers and tributaries of the Tapi Watershed in India for 2012. Rivers & tributaries data is compiled from high-resolution (1m) imagery. This layer is part of the Watershed Map of India which includes information about drainage networks (i.e. major rivers, streams and large reservoirs.) Also includes data on catchment areas/watersheds boundaries, basins and sub-basins.These data are intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.Read More

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© City of Virginia Beach Public Works Department

The U.S. Geological Survey (USGS) has calculated over 25 different basin characteristics as part of preparing the West Virginia StreamStats 2021 application. These datasets are raster representations of various environmental, geological, and land use attributes within the West Virginia StreamStats 2021 study area. This study area was defined by Watershed Boundary HUC 8 digital data, and as such there is an area of about 70 square miles in the SE corner of WV is not included in these raster datasets as it drains towards Virginia. The basin characteristics data will be served in the West Virginia StreamStats 2021 application used to describe delineated watersheds. The StreamStats application provides access to spatial analytical tools that are useful for water-resources planning and management, and for engineering and design purposes. The map-based user interface can be used to delineate drainage areas, get basin characteristics, and estimates of flow statistics for data-collection ...

Drainage basin areas for 376 USGS streamgages in West Virginia and adjacent states were delineated digitally. The USGS Watershed Boundary Dataset HUC12 sub-watershed lines were used as outer limits of basins, and heads-up digitizing was used to delineate boundaries from the stream gage to the HUC12 boundary. The USGS National Map was used, as background, to show both contour lines and digital elevation to highlight drainage basin divides, ridges, and valleys. Basins were delineated for (1) all active continuous-flow and crest-stage streamgages, in West Virginia, through water year 2020, (2) selected inactive streamgages, in West Virginia and adjacent states, that were used in the flood-frequency report prepared by Wiley and Atkins (2010), (3) Selected streamflow stations in West Virginia included in the low-flow report by Wiley and Atkins (2006), 4) historic West Virginia streamgages with published daily flow values, and (5) selected stage-only streamgages.For some historical streamgages included in this dataset, either the basin perimeter or the stream location have been altered by human activity since the gage was operated. Drainage basins for these streamgages were digitized from topographic maps contemporaneous with the period of streamflow record, so that their published drainage areas would continue to accurately reflect the drainage area when streamflow data were collected. Streamgage 03198022 was digitized from the 1971 topographic map because the basin perimeter was altered by construction after the streamgage was discontinued, and streamgages 03212567 and 03213495 were digitized from 1968 topographic maps because the basin perimeter was altered by surface mining after the streamgage was discontinued. Streamgages 03055040 and 03059500 were operated on streams that have been moved substantially since the streamgages were discontinued; basins for these streamgages were digitized from the historic streamgage locations, which are no longer on streams. Six streamgages, 01607000, 01636451, 01636462, 03060000, 03181000, and 03183200 are included in the point file for completeness, although no basins were delineated for them because they were on springs or karst-affected streams where the surface drainage basin was known to have little relationship to the actual drainage basin. Drainage basin areas, provided in this data release were updated in the National Water Information System (NWIS). Provided in the file 'WVBasinboundary.zip' is a geodatabase with (1) a point feature class of streamgage stations as described above (WV_Surfacewater_sites), (2) a feature dataset that contains the digitized drainage areas in polygon(WVBoundary_poly) and line (WVboundary_arc) format.

This polygon shapefile shows the sub-basin boundaries of the Ravi Watershed in India for 2012. This layer is part of the Watershed Map of India which includes information about drainage networks (i.e. major rivers, streams and large reservoirs.) Also includes data on catchment areas/watersheds boundaries, basins and sub-basins.These data are intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production.

This data release is a subset of the National Hydrography Dataset (NHD) water bodies, specifically lakes Mendocino and Sonoma in the Russian River watershed. The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage system. NHD data was originally developed at 1:100,000-scale and exists at that scale for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000 scale, adds detail to the original 1:100,000-scale NHD. (Data for Alaska, Puerto Rico and the Virgin Islands was developed at high-resolution, not 1:100,000 scale.) Local resolution NHD is being developed where partners and data exist. The NHD contains reach codes for networked features, flow direction, names, and centerline representations for areal water bodies. Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee. The National Hydrography Dataset is a comprehensive set of digital spatial data that encodes information about naturally occurring and constructed bodies of water, paths through which water flows, and related entities. The information encoded about features includes a feature date, classification by type, other characteristics, a unique common identifier, the feature length or area, and (rarely) elevation of the surface of water pools and a description of the stage of the elevation. For reaches, encoded information includes a reach code. Names and their identifiers in the Geographic Names Information System, are assigned to most feature types. The direction of flow is encoded for networked features. The data also contains relations that encode metadata, and information that supports the exchange of future updates and improvements to the data. The names and definitions of all feature types, characteristics, and values are in the Standards for National Hydrography Dataset: Reston, Virginia, U.S. Geological Survey, 1999. The document is available online through http://mapping.usgs.gov/standards/. The names and definitions of all feature types, characteristics, and values are in U.S. Geological Survey, 1999, Standards for National Hydrography Dataset High Resolution: Reston, Virginia, U.S. Geological Survey. The document is available online through http://mapping.usgs.gov/standards/. Information about tables and fields in the data are available from the user documentation for the National Hydrography Dataset at http://nhd.usgs.gov. The National Map - Hydrography Fact Sheet is also available at: http://erg.usgs.gov/isb/pubs/factsheets/fs06002.html.