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E2NHDPlusV2_us: Database of Ancillary Hydrologic Attributes and Modified Routing for NHDPlus Version 2.1 Flowlines


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Schwarz, G.E., 2019, E2NHDPlusV2_us: Database of Ancillary Hydrologic Attributes and Modified Routing for NHDPlus Version 2.1 Flowlines: U.S. Geological Survey data release,


The National Hydrography Dataset Plus, Version 2 (NHDPlusV2) is an attribute rich, digital hydrologic network for the Conterminous U.S. developed by the U.S. Environmental Protection Agency (EPA) and U.S. Geological Survey (USGS). SPAtially Referenced Regressions On Watershed attributes (SPARROW), is a process-based/statistical model that relies on a digital hydrologic network, like NHDPlusV2, in order to establish spatial relations between monitored contaminant loads, contaminant sources, and other watershed characteristics. The USGS National Water Quality Assessment (NAWQA) project adopted the medium-resolution NHDPlusV2 network as the primary framework supporting SPARROW modeling, and has become a unifying system for reporting hydrologic [...]


Point of Contact :
Gregory E Schwarz
Process Contact :
Gregory E Schwarz
Originator :
Gregory E Schwarz
Metadata Contact :
John W Brakebill
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
USGS Mission Area :
Water Resources
SDC Data Owner :
Integrated Modeling & Prediction Division

Attached Files

Click on title to download individual files attached to this item.
“E2NHDPlusV2_us network”
258.41 MB application/zip
“SAS Scripts used for processing”
129.22 KB application/zip
“supplemental xlsx files”
411.78 KB application/zip
“readme explaining contents”
15.61 KB application/vnd.openxmlformats-officedocument.spreadsheetml.sheet


These data represent a topologically reconditioned version of the NHDPlusV2 routing network (McKay and others, 2012), including enhanced attributes to improve flow routing and the physical description of flowlines. The modifications pertain only to NHDPlus data table values; no physical changes were made to the spatial locations of flowlines or catchments. The approach assumes the pre-existence of the NHDPlus network and its attributes, although many of the attributes can be generated without reference to existing values. The enhanced dataset, named E2NHDPlusV2_us, represents a national framework useful for the hydrologic referencing of spatial data, and is an extension of the work in Schwarz and Wieczorek, 2018. The data are useful to hydrologic modeling, such as the SPARROW water-quality model, and other analyses relating spatial features to hydrologic data.



  • USGS Data Release Products



Additional Information


Type Scheme Key
DOI doi:10.5066/P986KZEM

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