epa.gov:97339E8F-4762-4DEA-9627-AF1B775BF61F eng; USA utf8 dataset U.S. Environmental Protection Agency not available, see email address not available, see email address Washington DC 20460 waters_support@epa.gov pointOfContact 2024-03-14 ISO 19115 Geographic Information - Metadata ISO 19115:2003/Cor.1:2006(E) National Hydrography Dataset Plus - NHDPlus 2012-01-01 publication 2.10 U.S. Environmental Protection Agency Washington D.C. publisher U.S. Environmental Protection Agency (USEPA) and the U.S. Geological Survey (USGS). originator VECTOR DIGITAL DATA, RASTER DIGITAL DATA, TABULAR DIGITAL DATA This high-level metadata data document will be supplemented with detailed regional metadata at a later date. The NHDPlusV2 is an integrated suite of application-ready geospatial data sets that incorporate many of the best features of the National Hydrography Dataset (NHD) and the National Elevation Dataset (NED). Interest in estimating stream flow volume and velocity to support pollutant fate-and-transport modeling was the driver behind the joint USEPA and USGS effort to develop the initial NHDPlus, referenced in this document as NHDPlusV1. NHDPlusV1 has been used in a wide variety of applications since its initial release in the fall of 2006. This widespread positive response prompted the multi-agency NHDPlus team to develop NHDPlus Version 2 (NHDPlusV2). The NHDPlusV2 includes a stream network (based on the NHD), improved networking, naming, and "value-added attributes" (VAA's). NHDPlusV2 also includes elevation-derived catchments (drainage areas) produced using a drainage enforcement technique first broadly applied in New England, and thus dubbed "The New-England Method". This technique involves "burning-in" the NHD network and building "walls" using the national Watershed Boundary Dataset (WBD). The hydro-enforced digital elevation model (DEM) is used to produce hydrologic derivatives that agree with the NHD and WBD. An interdisciplinary team from the USGS, USEPA and contractors, has found this method to produce the best quality NHD catchments using an automated process. The VAAs include greatly enhanced capabilities for upstream and downstream navigation, analysis and modeling. Examples include: retrieve all flowlines (predominantly confluence-to-confluence stream segments) and catchments upstream of a given flowline using queries rather than by slower flowline-by-flowline navigation; retrieve flowlines by stream order; select a stream level path sorted in hydrologic order for stream profile mapping, analysis and plotting; and, calculate cumulative catchment attributes using streamlined VAA hydrologic sequencing routing attributes. The VAAs include results from the use of these cumulative routing techniques, including cumulative drainage areas, precipitation, temperature, and runoff distributions. Several of these cumulative attributes are used to estimate mean annual flow and velocity as part of the VAAs. NHDPlusV2 in CONUS contains a snapshot (2012) of the 1:100,000-scale NHD that has been extensively improved over the snapshot used in NHDPlusV1. These updates have not been stored in the central NHD repository at USGS. NHDPlusV2 in the islands is basin on a 2014/2015 snapshot of the 1:24,000 NHD. NHDPlusV2 users may not make updates to the NHD portions of NHDPlusV2 with the intent of sending these updates back to the USGS. Updates to the 1:100,000-scale NHD snapshot should be sent to the USEPA as the primary steward. Updates to the 1:24,000-scale NHD shapshot should be sent to the USGS. Purpose: The geospatial data sets included in NHDPlusV2 are intended to support a variety of water-related applications. They already have been used in an application to develop estimates of mean annual streamflow and velocity for each NHDFlowline feature in the conterminous United States. The results of these analyses are included with the NHDPlusV2 data. NHDPlusV2 serves as the sample frame for the stream and lake surveys conducted by the USEPA under the National Aquatic Resources Surveys program. A water-quality model developed by the U.S. Geological Survey (USGS) called SPARROW (Spatially Referenced Regressions on Watershed Attributes), can utilizes the NHDPlusV2 network functionality to track the downstream transport of nutrients, sediments, or other substances. NHDPlusV2 water bodies and estimates of streamflow and velocity are used in SPARROW to identify reservoir retention and in-stream loss factors. NHDPlusV2 climatic and land surface attributes can be used in SPARROW to identify potential factors in the delivery of nutrients from the land surface to streams. NHDPlusV2 data is also being used in select areas for a USGS Web-based application, called StreamStats. StreamStats provides tools to interactively select any point in the implemented areas, delineate watersheds, and to obtain streamflow and watershed characteristics for the selected point. NHDPlusV2 has been designed to accommodate many users' needs for future applications. NHDPlusV2 provides the framework and tools necessary to customize the behavior of the network relationships as well as building upon the attribute database, for which the user can assign their own data to the network. The geospatial data sets included in NHDPlusV2 are intended to support a variety of water-related applications. They already have been used in an application to develop estimates of mean annual streamflow and velocity for each NHDFlowline feature in the conterminous United States. The results of these analyses are included with the NHDPlusV2 data. A water-quality model developed by the U.S. Geological Survey (USGS) called SPARROW (Spatially Referenced Regressions on Watershed Attributes), can utilize the NHDPlusV2 network functionality to track the downstream transport of nutrients, sediments, or other substances. NHDPlusV2 water bodies and estimates of streamflow and velocity are used in SPARROW to identify reservoir retention and in-stream loss factors. NHDPlusV2 climatic and land surface attributes can be used in SPARROW to identify potential factors in the delivery of nutrients from the land surface to streams. NHDPlusV2 data is also being used in select areas for a USGS Web-based application, called StreamStats. StreamStats provides tools to interactively select any point in the implemented areas, delineate watersheds, and to obtain streamflow and watershed characteristics for the selected point. NHDPlusV2 has been designed to accommodate many users' needs for future applications. NHDPlusV2 provides the framework and tools necessary to customize the behavior of the network relationships as well as building upon the attribute database, for which the user can assign their own data to the network. Acknowledgement of the originating agencies (USEPA and USGS) would be appreciated in products derived from these data. completed U.S. Environmental Protection Agency, WATERS Support see email address see email address Washington DC 20460 USA waters_support@epa.gov pointOfContact irregular Stream / River Lake / Pond Canal / Ditch Reservoir Spring / Seep Swamp / Marsh Artificial Path Reach Watershed Catchment EARTH SCIENCE Land Surface Topography Cartography GEODATA GIS USGS EPA Elevation National Elevation Dataset NED National Hydrography Dataset NHD NHDPlus Stream flow Stream velocity Spatially Referenced Regression on Watershed Attributes SPARROW StreamStats Water-quality Hydrologic Modeling River Coding Systems Hydrography theme None United States of America United States USA Alabama American Samoa Arizona Arkansas California Colorado Connecticut Delaware District of Columbia Florida Georgia Guam Idaho Hawaii Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Northern Mariana Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island South Carolina South Dakota Tennessee Texas US Virgin Islands Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming place None Although this data set has been used by the U.S. Government, no warranty expressed or implied is made by the U.S. Government as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Government in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. otherRestrictions Use Constraints: None. otherRestrictions Access Constraints: None. NO CONFIDENTIALITY https://edg.epa.gov/EPA_Data_License.html Standard Technical Controls eng; USA inlandWaters -170.9 145.9 -14.4 50.7 2012-01-01 ESRI Workspace unknown U.S. Environmental Protection Agency not available, see email address not available, see email address Washington DC 20460 waters_support@epa.gov distributor none https://www.epa.gov/waterdata/nhdplus-national-hydrography-dataset-plus download Download The URL providing direct access to the downloadable dataset. download https://www.epa.gov/waterdata/nhdplus-national-hydrography-dataset-plus ESRI Workspace information dataset Data are complete for the conterminous United States. See release notes by Vector Processing Unit (VPU) for additional information. Data are complete for the conterminous United States. See release notes by Vector Processing Unit (VPU) for additional information. Data were processed with ArcGIS 9.3.1, and should not contain any topological errors. This lineage was generated by the FGDC CSDGM to 19139 transformation NHDPlus generated, see NHDPlus user guide for more information - See https://www.epa.gov/waterdata/basic-information 2012-06-11T00:00:00 Source Contribution: A snapshot of the CONUS NHD was used as the baseline framework from which enhancements to the network were built upon. Enhancements include feature names, network connectivity and network flow relationships. This enhanced NHD version was then used in conjunction with the NED, and WBD to create a hydro-enforced DEM, for generation of the catchment Grid/shapefile, and flow direction/accumulation Grids. The enhanced NHD was used to compute and assign flowline Value Added Attributes (VAAs) to this network.Source Type: online 100000 National Hydrography Dataset (NHD) Medium Resolution 2012-01-01 publication none U.S. Geological Survey (USGS) and the U.S. Environmental Protection Agency (USEPA) originator mapDigital 2012-01-01 Source Contribution: A snapshot of the NHD was used as the baseline framework for the NHDPlusV2 in the islands. The NHD was used in conjunction with the NED, and WBD to create a hydro-enforced DEM, for generation of the catchment Grid/shapefile, and flow direction/accumulation Grids. The enhanced NHD was used to compute and assign flowline Value Added Attributes (VAAs) to this network.Source Type: online 24000 National Hydrography Dataset (NHD) High Resolution 9999-01-01 publication none U.S. Geological Survey originator mapDigital 2014-01-01 Source Contribution: NED data used in combination with NHD and WBD to create a hydro-enforced, NHDPlusV2 Catchments, surface flow direction and accumulation Grids. Stream elevations from NED which were used to help derive stream slope and stream velocity. NED snapshot dates used were as follows: August 2010 - VPU04 February 2011 - VPUs 05, 06 June 2011 - VPU 17 August 2011 - VPUs 07, 10L, 10U, 11, 18 December 2011 - VPUs 01, 02, 03N, 03S, 03W, 08, 09, 12, 13, 14, 15, 16 January 28, 2014 - VPUs 20, 21, 22MA February 10, 2014 - VPU 22AS February 19, 2014 - VPU 22GUSource Type: disc 24000 National Elevation Dataset (NED) 2011-01-01 publication none U.S. Geological Survey Sioux Falls SD publisher U.S. Geological Survey (USGS), Denver originator mapDigital Multiple snapshots of the NED were obtained and used during NHDPlusV2 production. See the snapshot dates for each NHDPlusV2 Vector Processing Unit (VPU) in this Source Citation. 2010-08-01 2011-02-01 2011-06-01 2011-08-01 2011-12-01 Source Contribution: 12-digit Hydrologic Unit (HUC 12) divides from the Watershed Boundary Dataset (WBD) were used as ridgeline enforcment input in a process called "walling" in the production of hydro-enforced DEMs. Closed basin designations, from the HUC 12 polygon data were used to impose "sinks" in the hydro-enforced DEMs. These DEMs are the source data from which NHDPlusV2 Catchments are delineated from. Catchments with corresponding boundaries in the WBD generally agree with the WBD to within one or two 30-m grid cells. Some larger differences between catchment boundaries and WBD boundaries do exist, however. NHDPlusV2 Flow Direction and Accumulation Grids are hydrologic derivative products of the hydro-enforced DEMs. Dates of WBD snapshots used were as follows: August 31, 2010 - VPU 04 March 10, 2011 - VPUs 05, 06 July 14, 2011 - VPU 17 September 16, 2011 - VPU 10L October 7, 2011 - VPU 10U November 14, 2011 - VPUs 07, 11 December 2, 2011- VPU 18 December 21, 2011 - VPUs 09, 12 February 1, 2012 - VPUs 01, 02, 03N, 03S, 03W, 08, 13, 14, 15, 16 October 2014 - VPUs 20, 21 April 2015 - VPUs 22AS, 22GU, 22MP. The February 1, 2012 WBD snapshot used to migrate NHD medium resolution Reachcode assignment to agree with WBD HUC 8 codes. Reachcodes in VPUs 20, 21, 22AS, 22GU, and 22MP agree with their WBDSnapshots.Source Type: online 24000 Watershed Boundary Dataset (WBD) 2012-01-01 publication U.S. Department of Agriculture, Natural Resources Conservation Service (NRCS) and the U.S. Geological Survey (USGS) originator mapDigital Multiple snapshots of the WBD were obtained and used during NHDPlusV2 production. See the snapshot dates for each NHDPlusV2 Vector Processing Unit (VPU) in this Source Citation. 2010-08-31 2011-03-10 2011-07-14 2011-09-16 2011-10-07 2011-11-14 2011-12-02 2011-12-21 2012-02-01 Source Contribution: The Gageloc feature class was used for the QAQC of the estimates of mean annual stream flow and also in a gage flow adjustment process applied to the final mean annual stream flow estimates.Source Type: online 100000 USGS Streamgages Linked to the Medium Resolution NHD 9999-01-01 publication U.S. Geological Survey Reston VA publisher U.S. Geological Survey originator mapDigital 9999-01-01 unknown This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2024-02-09T11:11:00 version of the FGDC CSDGM to ISO 19139 transform. U.S. Environmental Protection Agency not available, see email address not available, see email address Washington DC 20460 waters_support@epa.gov pointOfContact