This data set contains polygons representing potential areas of groundwater discharge (PAGWD) for the upper Humboldt River Basin, northeastern Nevada.

This data set contains polygons representing the groundwater discharge areas for the 14 hydrographic areas in the middle Humboldt River Basin, north-central Nevada.

This data set contains polygons representing the groundwater discharge areas for the 14 hydrographic areas in the middle Humboldt River Basin, north-central Nevada.

This USGS data release represents the evapotranspiration units and potential areas of groundwater discharge geospatial data from the following publication: Plume, R.W., and Smith, J.L., 2013, Properties of basin-fill deposits, a 1971–2000 water budget, and surface-water-groundwater interactions in the upper Humboldt River basin, northeastern Nevada: U.S. Geological Survey Scientific Investigations Report 2013-5077, 38 p., http://pubs.usgs.gov/sir/2013/5077/. The data set consists of 2 separate items: 1. evapotranspiration units 2. potential areas of groundwater discharge

This USGS data release represents the evapotranspiration units and potential areas of groundwater discharge geospatial data from the following publication: Plume, R.W., and Smith, J.L., 2013, Properties of basin-fill deposits, a 1971–2000 water budget, and surface-water-groundwater interactions in the upper Humboldt River basin, northeastern Nevada: U.S. Geological Survey Scientific Investigations Report 2013-5077, 38 p., http://pubs.usgs.gov/sir/2013/5077/. The data set consists of 2 separate items: 1. evapotranspiration units 2. potential areas of groundwater discharge

These data represent potential areas of ground-water discharge for selected hydrographic areas in eastern Nevada and western Utah. The data are based on phreatophyte boundaries published by the U.S. Geological Survey (USGS) and on unpublished boundaries mapped by the Southern Nevada Water Authority (SNWA). Selected basins also were mapped by the USGS during an aerial field reconnaissance. The largest phreatophyte extent from all the sources was typically selected as the final boundary where a basin was covered by multiple boundaries. Selected basins were field verified and modified to reflect the ground condition during the summer of 2005. This data set also includes subbasin boundaries identified by Sweetkind and others (2007) (See Source_Information). The table below lists the boundary sources for each valley and whether the data were ground verified. > Valley Sources Field > verified ------------------------------------------------------------------------------------------ >Little Smoky Nichols, 2000; Harrill, 1988 Yes >Newark Nichols, 2000; Harrill, 1988 Yes >Long Nichols, 2000; Harrill, 1988; SNWA Yes >Jakes Nichols, 2000; SNWA Yes >Butte Nichols, 2000; Harrill, 1988; SNWA Yes >Steptoe Nichols, 2000; Harrill, 1988; SNWA No >Tippett Nichols, 2000 No >Spring Nichols, 2000; Harrill, 1988; SNWA Yes >Snake Harrill, 1988; SNWA; Aerial No >Lake Harrill, 1988; SNWA; Aerial Yes >Cave SNWA; Aerial No >White River Harrill, 1988; SNWA; Aerial Yes

These data represent potential areas of ground-water discharge for selected hydrographic areas in eastern Nevada and western Utah. The data are based on phreatophyte boundaries published by the U.S. Geological Survey (USGS) and on unpublished boundaries mapped by the Southern Nevada Water Authority (SNWA). Selected basins also were mapped by the USGS during an aerial field reconnaissance. The largest phreatophyte extent from all the sources was typically selected as the final boundary where a basin was covered by multiple boundaries. Selected basins were field verified and modified to reflect the ground condition during the summer of 2005. This data set also includes subbasin boundaries identified by Sweetkind and others (2007) (See Source_Information). The table below lists the boundary sources for each valley and whether the data were ground verified. > Valley Sources Field > verified ------------------------------------------------------------------------------------------ >Little Smoky Nichols, 2000; Harrill, 1988 Yes >Newark Nichols, 2000; Harrill, 1988 Yes >Long Nichols, 2000; Harrill, 1988; SNWA Yes >Jakes Nichols, 2000; SNWA Yes >Butte Nichols, 2000; Harrill, 1988; SNWA Yes >Steptoe Nichols, 2000; Harrill, 1988; SNWA No >Tippett Nichols, 2000 No >Spring Nichols, 2000; Harrill, 1988; SNWA Yes >Snake Harrill, 1988; SNWA; Aerial No >Lake Harrill, 1988; SNWA; Aerial Yes >Cave SNWA; Aerial No >White River Harrill, 1988; SNWA; Aerial Yes

This dataset represents "phreatophyte areas" mapped as part of a groundwater reconnaissance effort in four valleys in central Nevada and published in 1964. The data were digitized for comparison with mapping of groundwater discharge areas done in 2011 as part of a groundwater study in these valleys published in 2016.

The U.S. Geological Survey (USGS) as part of the Department of Interior WaterSmart Program compiled published estimates of groundwater discharge to streams in the Upper Colorado River Basin into a dataset and developed a geospatial database. For the purpose of this compilation, groundwater discharge to streams consists of base-flow, and may include contributions from groundwater discharge from various flow paths, lateral seepage, hyporheic flow, and irrigation return flow. Stream reaches from the National Hydrography Dataset (NHD) where there was groundwater discharge estimates were delineated in the geospatial database. Attributes describing the methods used for estimating groundwater discharge were created. Feature class attributes associated with each stream reach include: groundwater discharge (acre-ft/yr), method of measurement, report reference, defined reach, base flow index estimate (acre-ft/yr), and 8-digit HUC(s) (hydrologic unit code(s) for the reach). In addition, groundwater discharge estimates were calculated using attributes from a flow characteristics dataset (Wolock, 2003), the average annual base-flow index (BFI) value and the average daily streamflow value. The calculated groundwater discharge estimates were included in the database as separate attributes and were compared to reported estimates of groundwater discharge. Groundwater discharge estimates calculated using BFI were greater than reported groundwater discharge estimates. References cited: Wolock, D., 2003, Flow Characteristics at U.S. Geological Survey Streamgages in the Conterminous United States: U.S. Geological Survey Open-File Report 2003-146, accessed July 2, 2012 at https://water.usgs.gov/GIS/metadata/usgswrd/XML/qsitesdd.xml

The U.S. Geological Survey (USGS) as part of the Department of Interior WaterSmart Program compiled published estimates of groundwater discharge to streams in the Upper Colorado River Basin into a dataset and developed a geospatial database. For the purpose of this compilation, groundwater discharge to streams consists of base-flow, and may include contributions from groundwater discharge from various flow paths, lateral seepage, hyporheic flow, and irrigation return flow. Stream reaches from the National Hydrography Dataset (NHD) where there was groundwater discharge estimates were delineated in the geospatial database. Attributes describing the methods used for estimating groundwater discharge were created. Feature class attributes associated with each stream reach include: groundwater discharge (acre-ft/yr), method of measurement, report reference, defined reach, base flow index estimate (acre-ft/yr), and 8-digit HUC(s) (hydrologic unit code(s) for the reach). In addition, groundwater discharge estimates were calculated using attributes from a flow characteristics dataset (Wolock, 2003), the average annual base-flow index (BFI) value and the average daily streamflow value. The calculated groundwater discharge estimates were included in the database as separate attributes and were compared to reported estimates of groundwater discharge. Groundwater discharge estimates calculated using BFI were greater than reported groundwater discharge estimates. References cited: Wolock, D., 2003, Flow Characteristics at U.S. Geological Survey Streamgages in the Conterminous United States: U.S. Geological Survey Open-File Report 2003-146, accessed July 2, 2012 at https://water.usgs.gov/GIS/metadata/usgswrd/XML/qsitesdd.xml