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This data is intended for small scale cartographic display of NHD Plus stream line work.
The geospatial data sets included in NHDPlus 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 NHD flowline in the conterminous United States. The results of these analyses are included with the NHDPlus data. A water-quality model developed by the U.S. Geological Survey (USGS) called SPARROW (Spatially Referenced Regressions on Watershed Attributes), can utilize the NHDPlus network functionality to track the downstream transport of nutrients, sediments, or other substances. NHDPlus water bodies and estimates of streamflow and velocity are used in SPARROW to identify reservoir retention and in-stream loss factors. NHDPlus 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. NHDPlus land cover information is useful for SPARROW in determining potential sources of nutrients. NHDPlus data is also being used in select areas for a USGS Web-based application, called StreamStats. StreamStats provides tools to interactively select any point on the NHDPlus to obtain streamflow and watershed characteristics for the selected point. NHDPlus has been designed to accommodate many users needs for future applications. NHDPlus 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 its own data to the network. |
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This data is intended for small scale cartographic display of NHD Plus stream line work.
The geospatial data sets included in NHDPlus 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 NHD flowline in the conterminous United States. The results of these analyses are included with the NHDPlus data. A water-quality model developed by the U.S. Geological Survey (USGS) called SPARROW (Spatially Referenced Regressions on Watershed Attributes), can utilize the NHDPlus network functionality to track the downstream transport of nutrients, sediments, or other substances. NHDPlus water bodies and estimates of streamflow and velocity are used in SPARROW to identify reservoir retention and in-stream loss factors. NHDPlus 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. NHDPlus land cover information is useful for SPARROW in determining potential sources of nutrients. NHDPlus data is also being used in select areas for a USGS Web-based application, called StreamStats. StreamStats provides tools to interactively select any point on the NHDPlus to obtain streamflow and watershed characteristics for the selected point. NHDPlus has been designed to accommodate many users needs for future applications. NHDPlus 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 its own data to the network. |
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This dataset consists of NHD flowlines that have a NHDFlowlineVAAThinner value equal to 3. Progressively denser networks may be generated by selecting
NHDPlus flowlines that have NHDFlowlineVAA.Thinner <= 2 then 3, 4, 5, and 6.
The NHDPlus includes a stream network (based on the 1:100,000-scale NHD), improved networking, naming, and "value-added attributes" (VAA's). NHDPlus 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 1:100,000-scale NHD and when available building "walls" using the national Watershed Boundary Dataset (WBD). The resulting modified digital elevation model (HydroDEM) is used to produce hydrologic derivatives that agree with the NHD and WBD. |
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["Artificial Path","Canal / Ditch","Cartography","Catchment","EARTH SCIENCE","elevation","EPA","GEODATA","GIS","Hydrography","Hydrologic modeling","Hydrology","inlandWaters","Lake / Pond","Land Cover","Land Surface","National Elevation Dataset","National Hydrography Dataset","National Land Cover Dataset","NED","NHD","NHDPlus","NLCD","Oregon","Reach","Reservoir","Riparian","River Coding Systems","SPARROW","Spatially Referenced Regressions on Watershed Attributes","Spring / Seep","Stream / River","Stream flow","Stream velocity","StreamStats","Swamp / Marsh","Topography","USGS","Washington","Water-quality","Watershed"] |