Susan G. Buto Jason C. Reichelt 2009 vector digital data http://water.usgs.gov/lookup/getspatial?ha694c_ha1000gb Harrill, J.R. Gates, J.S. Thomas, J.M. 1988 U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/ha/ha694C This data set consists of hydrographic area and major flow system boundaries and polygons delineated at 1:1,000,000-scale for the Great Basin. The intended uses of this data set include, but are not limited to, natural resource modeling, mapping, and visualization applications. Hydrographic areas (HA) in Nevada were delineated by the U.S. Geological Survey (USGS) and Nevada Division of Water Resources in the late 1960s (Cardinalli and others, 1968; Rush, 1968) for scientific and administrative purposes. The official HA names, numbers, and boundaries continue to be used in USGS scientific reports and Division of Water Resources administrative activities. The Nevada HAs were published in digital format at 1:750,000-scale by the USGS in 2005 (Peltz and others, 2005). This dataset represents HAs for the Great Basin region of the United States. The data set covers parts of Nevada, California, Idaho, Oregon and Utah. The HA naming and numbering system is similar to the Nevada system but some differences exist. Notable differences are as follows: Great Basin HA 254 - Snake Valley is composed of three valleys in the Nevada HA system: HA 196 - Hamlin Valley, HA 194 - Pleasant Valley, and HA 195 - Snake Valley. Great Basin HA 243 - Death Valley is composed of two valleys in the Nevada system: HA 231 - Grapevine Canyon, and HA 232 - Oriental Wash. Great Basin HA 280 - Beryl-Enterprise Area is HA 197 - Escalante Desert in the Nevada system Great Basin HA 48 - Tenmile Creek Area is named "Dixie Creek-Tenmile Creek area" in the Nevada system. The HA number is the same in both data sets. Great Basin HA 252 - Pilot Valley does not exist in the Nevada system. The area is part of Nevada HA 192 - Great Salt Lake Desert. Great Basin HA 261A - Great Salt Lake Desert (West Part) is HA 192 - Great Salt Lake Desert in the Nevada system. Great Basin HA 251 - Grouse Creek Valley is HA 190 - Grouse Creek Valley in the Nevada system. The Southwestern boundary of this area is delineated differently in the Nevada data. Great Basin HA 253 - Deep Creek Valley is HA193 - Deep Creek Valley in the Nevada system. This dataset was constructed from a scanned image of a paper USGS Hydrologic Atlas consisting of two sheets (Harrill and others, 1988). Boundary lines were digitized from the 1:1,000,000-scale map on sheet 2 of the Atlas. Polygon attributes including hydrographic area and flow system names and numbers are based on an index map and list of names presented on sheet 1 of the Hydrologic Atlas. Hydrographic area boundary lines present on the index map were missing, illegible, or incomplete on sheet 2 in several instances. In most cases, the missing boundaries were either estimated from information available on sheet 2 or derived from the 1:750,000-scale digital Nevada hydrographic areas noted earlier (HA750; Peltz and others, 2005). Lines derived from other sources or estimated are identified in the line source attribute in the dataset "ha1000gb_l". Hydrographic area boundaries visible on the index map (sheet 1) but missing on sheet 2 were not included in this dataset in three instances. The lines were omitted because there was no basis for estimating an accurate boundary based on information on the 1:1,000,000-scale map or other data sources. These instances and the reasons for their omission are as follows: 1. The index map divides Dayton Valley (hydrographic area 103) into two subareas. The lines are not present on HA-694-C - sheet 2 and do not exist in HA750. These division lines were left out of the digital dataset. 2. The index map divides Utah Valley (hydrographic area 265) into three subareas. The lines are not present on HA-694-C - sheet 2. Hydrographic areas outside the State of Nevada are not available from HA750. These division lines were left out of the digital dataset. 3. The index map divides Quinn River Valley (hydrographic area 33) into three subareas. The lines for subarea C are not evident on HA-694-C - sheet 2. Hydrographic areas outside the State of Nevada are not available from HA750. This division line was left out of the digital dataset. In addition, two typographic and cartographic errors were found on the source index map: 1. HA 121 - Soda Spring Valley is divided into three subareas: 121A - Eastern Part, 121B - Western Part, and 121C - Central Part. The index map is labeled correctly. The associated list of HA names mistakenly identifies 121B as both the Western subarea and as the Eastern subarea. This data set uses the index map convention. 2. HA 164 - Ivanpah Valley is divided into two subareas: 164A - Northern Part, and 164B - Southern Part. The index map is labeled correctly. The numbers are reversed on the associated list of HA names. This data set uses the index map convention. References cited: Cardinalli, J.L., Roach, L.M., Rush, F.E., and Vasey, B.J., 1968, State of Nevada hydrographic areas, scale 1:500,000, in Rush, F.E., ed., Index of hydrographic areas: Nevada Division of Water Resources Information Report 6, 38 p. Harrill, J.R., Gates, J.S., and Thomas, J.M., 1988, Major ground-water flow systems in the Great Basin region of Nevada, Utah, and adjacent states: U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C, scale 1:1,000,000, 2 sheets. Peltz, L.A., Medina, R.L., and Buto, S.G., 2005, 1:750,000-scale hydrographic areas and basin-wide pumpage, recharge and interbasin flow estimates of Nevada: U.S. Geological Survey vector digital data, http://water.usgs.gov/lookup/getspatial?nv_ha750nv Rush, F.E., 1968, Index of hydrographic areas in Nevada: Nevada Division of Water Resources Information Report 6, 38 p. 1988 publication date Complete None planned -120.329726 -110.845124 42.643413 35.116974 none hydrographic area flow system ISO 19115 Topic Category inlandWaters none California Idaho Nevada Oregon Utah Great Basin None Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, as well as ArcGIS format, this metadata file may include some ArcGIS-specific terminology. These data are not intended to be used as a survey product and are for reference purposes only. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. U.S. Geological Survey Center Director mailing and physical address

2329 Orton Circle

West Valley City UT 84119 USA (801)908-5000 (801)908-5001 http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds457_ha694c_ha1000gb http://water.usgs.gov/GIS/browse/ha694c_gbha1000_gb.jpg Illlustration of data set GIF Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Technical review of these data was provided by Rose L. Medina and Kimberly Jones of the U.S. Geological Survey. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.535 Harrill, J.R. Gates, J.S. Thomas, J.M. Mifflin, M.D. 1988 map Plate 3, scale 1:1,000,000 Rosenshein, J.S.; ed Seaber, P.R.; ed. 1988 document Geology of North America v. 0-2 Boulder, CO Geological Society of America Medina, R.L. 2005 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ha694c_et1000gb_p Harrill, J.R. Gates, J.S. Thomas, J.M. 1988 map U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/ha/ha694C U.S. Geological Survey 2005 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ha694c_spg1000gb_x Harrill, J.R. Gates, J.S. Thomas, J.M. 1988 map U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/ha/ha694C Buto, S.G. 2009 document U.S. Geological Survey Data Series DS-457 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/ds/457/ All attempts were made to compare 100 percent of the digital spatial data to the source map. Verification was done by visual and manual comparison, combined with on-screen review with hard copy plots. Frequency tests were run on the line and polygon attributes to check that no features were unlabeled, misspelled, or inconsistent. Corrections were made until two comparisons determined 100 percent of the digital spatial data matched the original source map. Exceptions are noted in the supplemental information and process step sections of this document. The logical consistency topologically is clean. Polygon and chain-node topology is present. Using ArcGIS topology tools and routines, all polygons were checked for closure, sliver polygons, gaps, and duplicate features; all arcs were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Complete at 1:1,000,000-scale for the Great Basin as defined by the source publication National Map Accuracy Standards (NMAS) established for the United States in 1947 (U.S. Geological Survey, 1988) state that no more than 10 percent of features shall be more than 1/50th of an inch from their intended location on maps of scale smaller than 1:20,000. National Standards for Spatial Data Accuracy (NSSDA) published by the Federal Geographic Data Committee (FGDC) in 1998 relate the NMAS to the digital geospatial data standard by multiplying the NMAS accuracy by a factor of 1.1406 (Federal Geographic Data Committee, 1998) resulting in expected error in the geospatial data at standard mapping scales as follows: >1: 24,000-scale map - 14 meters >1: 62,500-scale map - 36 meters >1: 100,000-scale map - 58 meters >1: 250,000-scale map - 145 meters >1: 500,000-scale map - 290 meters >1:1,000,000-scale map - 579 meters This dataset is derived from a scanned copy of a folded map in fair condition. 600 meters Errors resulting from source map quality, automation processes, and scale resolution can impact the accuracy of data. Errors resulting from source map quality and automation processes are unknown. According to the National Map Accuracy Standards of 1947 the inherent error of a 1:1,000,000-scale map is approximately 508 meters . The RMS error during georeferencing was approximately 90 meters. The horizontal positional accuracy was verified using visual and manual comparison as described in the horizontal positional accuracy report and the process steps and matches the positional accuracy of the original source map. The horizontal positional error is deductively estimated at 600 meters. Harrill, J.R. Gates, J.S. Thomas, J.M. 1988 map U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/ha/ha694C 1000000 paper 1988 publication date HA-694-C spatial and attribute information Peltz, L.S. Medina, R.L. Buto, S.G. 2005 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nv_ha750nv Rush, F.E. 1974 map Nevada Department of Conservation and Natural Resources, Division of Water Resources Map Not applicable Carson City, NV Nevada Department of Conservation and Natural Resources, Division of Water Resources 750000 vector digital data 1974 publication date HA750 spatial information HA-694-C sheet 2 was scanned at 400 dpi into tiff format. The tiff was georeferenced to digital tics representing corners of 30 by 60 minute U.S. Geological Survey topographic quadrangles. The image was georeferenced using tools provided in ArcGIS 9.0. The image was rectified using first order polynomial transformation with an RMS error of approximately 90 meters. HA-694-C 20050407 HA-694-C scan The lines were digitized from the source using ArcScan where possible. The complexity of the source map hindered the automation process so most of the data were digitized using manual methods. HA-694-C scan 200504 - 200506 ha694c_l v1 The hydrographic areas were compared with the index map found on HA-694-C - sheet 1. Lines from HA750 were copied to the data set in areas where the index map indicated the presence of a hydrographic subdivision or hydrographic area but no lines were evident on the source map (HA-694-C - sheet 2). Lines from HA750 were adjusted as necessary to remove dangles. Hydrographic areas indicated on the index map were not used in three cases: 1. The index map divides Dayton Valley (hydrographic area 103) into two subareas. The lines are not evident on HA-694-C and do not exist in HA750. These division lines were left out of the digital data. 2. The index map divides Utah Valley (hydrographic area 265) into three subareas. The lines are not evident on HA-694-C and Utah hydrographic areas are not available digitally from HA750. These division lines were left out of the digital data. 3. The index map divides Quinn River Valley (hydrographic area 33) into three subareas. The lines for subarea C are not evident on HA-694-C and the hydrographic areas are not available digitally from HA750. This division line was left out of the digital data. Topology tools were used to verify and correct the geodatabase topology until no errors remained in the data set. HA750 ha694c_l v1 200506 ha694c_l v2 1:1,000,000-scale hard copy plots of the data were generated and using a light table, these plots were visually and manually compared with HA-694-C. Corrections were made to the spatial data until two visual and manual comparisons, combined with on-screen review, determined there was no light between the original and digital lines. The attribute accuracy was verified by two visual and manual comparisons, combined with on-screen review, of plots with HA-694-C. HA-694-C HA-694-C scan HA750 ha694c_l v2 200506 ha1000gb_l ArcGIS tools were used to build polygons from the digitized lines. The polygons were attributed and the values checked until two comparisons indicated that the data were a fair representation of the source. Two typographic and cartographic errors were noted on the index map (sheet 1) as follows: 1. HA 121 - Soda Spring Valley is divided into three subareas: 121A - Eastern Part, 121B - Western Part, and 121C - Central Part. The index map is labeled correctly. The associated list of HA names mistakenly identifies 121B as both the Western subarea and as the Eastern subarea. This data set uses the index map convention. 2. HA 164 - Ivanpah Valley is divided into two subareas: 164A - Northern Part, and 164B - Southern Part. The index map is labeled correctly. The numbers are reversed on the associated list of HA names. This data set uses the index map convention. ha1000gb_l 200506 ha1000gb_p Vector G-polygon 258 String 692 Albers Conical Equal Area 29.500000 45.500000 -114.000000 23.000000 0.000000 0.000000 coordinate pair 0.000422 0.000422 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 ha1000gb_l Line feature class ESRI OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. HA694C_linetype Type of boundary the line represents HA-694-C 1 Study area boundary HA-694-C 2 Major flow system boundary HA-694-C 3 Major flow system boundary - uncertain HA-694-C 4 Hydrographic area within major flow system HA-694-C linesource Source of the line user-defined HA-694-C The line was digitized from the source map, sheet 2 user-defined HA750 The line was estimated from HA750 user-defined Estimated The line location was estimated from information on HA-694-C, sheets 1 and 2 user-defined SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. ha1000gb_p Polygon feature class ESRI OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. SHAPE Feature geometry. ESRI Coordinates defining the features. HA694C_hyd_area Hydrographic area number HA-694-C Hydrologic Investigations Atlas HA-694-C U.S. Geological Survey HA694C_hyd_area_name Hydrographic area name HA-694-C Hydrologic Investigations Atlas HA-694-C U.S. Geological Survey HA694C_subarea_name Hydrographic subarea name HA-694-C Hydrologic Investigations Atlas HA-694-C U.S. Geological Survey HA694C_flow_system Major flow system number HA-694-C Hydrologic Investigations Atlas HA-694-C U.S. Geological Survey HA694C_flow_system_name Major flow system name HA-694-C Hydrologic Investigations Atlas HA-694-C U.S. Geological Survey SHAPE_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. SHAPE_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

455 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Downloadable Data 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. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. Personal Geodatabase 9.3 Spatial and attribute information WinZip 12.3 MB http://water.usgs.gov/GIS/dsdl/ha694c_ha1000gb.zip XML workspace 2009 Spatial and attribute information WinZip 1.44 MB http://water.usgs.gov/GIS/dsdl/ha694c_ha1000gb_XML.zip Shapefile 2009 Spatial and attribute information. Note: field names have been altered to conform with shapefile restrictions. Line type description added to line dataset to maintain clarity. WinZip 1.17 MB http://water.usgs.gov/GIS/dsdl/ha694c_ha1000gb_shapefile.zip None. This dataset is provided by USGS as a public service. 2009 20090727 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ha694c_ha1000gb FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile