R.J. Laczniak and J.L. Smith 2001 Version 1.0 map Carson City, Nev. U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?darea Laczniak, Smith, Elliott, DeMeo, Chatigny, and Roemer 2001 Water-Resources Investigations Report 01-4195 Carson City, Nev. U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/wri/wri014195 The digital data set delineates the outer boundary of each major discharge area evaluated as part of the study. These areas were used to refine estimates of ground-water discharge throughout the Death Valley regional flow system. As delineated, boundaries include all phreatophytic vegetation and moist soil areas within a discharge area. The boundaries were used to focus efforts associated with classifying the different vegetation and soil conditions within a discharge area. The digital data set was developed to help classify the different vegetation and soil conditions to the major discharge areas of the Death Valley regional flow system. Introduction The digital data set was created in cooperation with the U.S. Department of Energy. The data set was created as part of a study to refine current estimates of ground-water discharge from the major discharge areas of the Death Valley regional flow system. The data set defines the boundary of each of the major discharge areas evaluated during the study. Boundaries initially were delineated from a preliminary vegetation index based on Landsat Thematic Mapper (TM) imagery, and later were refined on the basis of observations made during numerous field visits. Reviews The digital data set has gone through a multi-level, quality-control process to ensure that the data are a reasonable representation of discharge-area boundaries. Reviewers were asked to check metadata and other documentation files for completeness and accuracy. Reviewers also were asked to check the topological consistency, tolerances, projections, and geographic extent. Notes Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although the data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in non-proprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology. Users should exercise caution and judgment in applying these data, and be aware that errors may be present in any or all of the digital image data. If errors are encountered in this data set, it will be appreciated if the user would pass this information to the Metadata_Contact. 1993-1999 ground condition Complete None Planned -117.27204786 -116.01756493 37.31441361 35.6546784 none vegetation soil evapotranspiration discharge boundary ground water phreatophyte inlandWaters None Nevada southern Nevada eastern California Ash Meadows California Valley Chicago Valley China Ranch Death Valley Franklin Lake Franklin Well area Oasis Valley Resting Spring Sarcobatus Flat Shoshone Stewart Valley Tecopa none No use contraints apply. Users should exercise caution when applying these data. Acknowledgment of the U.S. Geological Survey and the U.S. Department of Energy would be appreciated in any products derived from these data. R.J. Laczniak U.S. Geological Survey Hydrologist mailing and physical address

6770 S. Paradise Rd.

Las Vegas NV 89119 USA 1-888-275-8747 (702) 897-4055 rlaczni@usgs.gov Compilation of this data set and the associated metadata was done in cooperation with the U.S. Department of Energy, Nevada Operations Office. IRIX64, 6.4, IP27 UNIX ArcInfo version 7.2.1 Multiple checks were performed to verify that each attribute represents its intended value. See Explanation. Where needed, an explanation is used to describe each attribute defined in the Entity_and_Attribute section. Polygon features present. See Supplemental Information. Horizontal accuracy is variable and dependent on how the boundary was mapped and the discretion of the researcher(s) who located the boundary. Where the boundary was mapped using a Global Positioning System (GPS), the accuracy is equal to that of the GPS unit. The unit used was a Precision Light-weight GPS Receiver (PLGR). Where the boundary was mapped on the basis of a preliminary vegetation index, the accuracy is as good as the resolution of the source imagery (about 30 meters). Multiple visual checks were performed to verify that boundaries are positioned as generally intended. 50 meters Boundaries initially were located from a preliminary vegetation map. The map was constructed from TM imagery acquired June 13, 1992. Results were transferred onto 1:24,000-scale maps. Boundaries were drawn and digitized accordingly. Initial boundary locations were refined from information gathered in the field. Refinements often included the acquisition of GPS coordinates. In general, boundary locations are considered accurate to about 50 meters of the location desired by the researcher. Boundaries representing the outer extent of phreatophytic vegetation were drawn on the basis of a preliminary vegetation index developed from TM imagery acquired June 13, 1992. Boundary locations were refined and adjusted to better represent ET units. Refinements were based on information obtained from numerous field visits. Boundary coordinates were checked periodically with a GPS receiver. The refinement process continued until the boundaries were considered reasonable for the discharge areas of interest. 1998-1999 Vector Point 25 String 30 GT-polygon composed of chains 26 Universal Transverse Mercator 11 coordinate pair 6.0 6.0 Meters North American Datum of 1927 Clarke 1866 6378206.4 294.98 DAREA.PAT Polygon attribute table ArcInfo(R) GIS Software AREA Degenerate area of polygon ArcInfo computed Positive real numbers NA NA PERIMETER Degenerate perimeter of polygon ArcInfo computed Positive real numbers NA NA DAREAS# Internal feature number ArcInfo computed Sequential unique positive integer NA NA DAREA-ID Assigned feature number User Integer NA NA DAREA Discharge area identifier User 1 Ash Meadows, Nev. User 2 Oasis Valley, Nev. User 3 Tecopa area, Calif. User 4 Shoshone area, Calif. User 5 Stewart Valley area, Nev. and Calif. User 6 Sarcobatus Flat, Nev. User 7 Franklin Well area, Calif. User 8 Franklin Lake, Calif. User 9 Chicago Valley, Calif. User 10 Death Valley, Calif. User U.S. Geological Survey Ask USGS - Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey 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. Geological Survey 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. Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/darea_data.tgz Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/darea_meta.tgz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+darea FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998