U.S. Geological Survey 2006 vector digital data Scientific Investigations Report 2006-5129 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_water_table_con U.S. Geological Survey 2006 document Scientific Investigations Report 2006-5129 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/sir/2006/5129/ This digital geospatial data set consists of potentiometric contours that show lines of equal altitude of the generalized, long-term, regional water table in the northern part of Las Animas County, Colorado. The U.S. Geological Survey developed this data set as part of a cooperative project with the Colorado Water Conservation Board. This digital geospatial data set consists of potentiometric contours that show lines of equal altitude of the generalized, long-term, regional water table in the northern part of Las Animas County, Colorado. 2006 publication date Complete None planned -105.072836 -104.432590 37.496189 37.066331 ISO 19115 Topic Category inlandWaters geoscientificInformation Geographic Names Information System (GNIS) Las Animas County Colorado Geologic Names Lexicon (GEOLEX) Trinidad Sandstone Vermejo Formation Raton Formation Poison Canyon Formation Cuchara Formation Huerfano Formation None This data set was prepared at a map scale of 1:400,000. U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir-06-5129_alt_water_table_con Compilation of this data set and associated metadata was done in cooperation with the Colorado Water Conservation Board. Technical review of this data set and metadata was provided by Steve Char of the U.S. Geological Survey. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_bottom_trinidad_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_top_raton_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_top_trinidad_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_alt_top_vermejo_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_cogcc_production_point U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_cogcc_production_point U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_bottom_trinidad_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_top_raton_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_top_trinidad_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_top_vermejo_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_depth_water_table_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_formation_tops_point U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_seo_wells_point U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_thickness_raton_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_thickness_trinidad_con U.S. Geological Survey 2006 vector digital data http://water.usgs.gov/lookup/getspatial?sir-06-5129_thickness_vermejo_con Johnson, R.B. 1969 document U.S. Geological Survey Miscellaneous Investigations Series Map I-558, scale 1:250,000, reprinted in 1983 Online_Linkage: http/pubs.er.usgs.gov/usgspubs/i/i558 Green, G.N. 1992 vector digital data U.S. Geological Survey Open-File Report 92-507 Part A. Documentation Part B. Common files Part C. Explanation sheet database Part D-O. Geospatial data in ARC/INFO format http://pubs.usgs.gov/of/1992/ofr-92-0507/ Contour lines were visually inspected for topological errors (crossing or touching contours). No errors were detected. Includes only contours within the Raton Basin, in the northern part of Las Animas County, Colorado. Contours not well supported by data were deleted. The input data set (sir-06-5129_seo_wells_point) was screened to select wells where depth to water (attribute DEPTH_WATE) was greater than zero (0) and less than or equal to 250 feet below ground surface, and the well was completed in the uppermost aquifer. The aquifer in which a selected well was completed was determined by comparing the attribute WDALT(the altitude of the bottom of the well) with the interpolated altitudes to the top of the Raton, Vermejo, and Trinidad aquifers. The land-surface altitude at the reported geographic locations of the wells were interpolated from the National Elevation Dataset (1/3 Arc-second resolution). The attribute WLALT (water-table altitude) was computed by subtracting the attribute DEPTH_WATE (reported depth to water) from attribute DEM_FT (the interpolated and-surface altitude, in feet) . 20051024 A geostatistical model of the altitude of the water table was generated using the geostatistcal analyst (GA) extension. The input points, the Z values, were the selected values of the attribute WLALT in sir-06-5129_seo_wells_point. The geostatistical model of the altitude of the water table was run with the following parameters: Selected Method: Ordinary Kriging Output: Prediction Map Number of datasets in use: 1 Number of Points: 646 Order of Trend Removal: First (Estimated by Local Polynomial Interpolation) Ratio global to local drift: 1:1 Semivariogram/Covariance: Model: 92316*Spherical(23346)+5389*Nugget Error modeling: Microstructure: 5389 (100%) Measurement error: 0 (0%) Searching Neighborhood: Neighbors to Include: 5 or at least 2 for each angular sector Searching Ellipse: Angle: 0 Major Semiaxis: 23346 Minor Semiaxis: 23346 Angular Sectors: 4 Lag size: 2700 Number of Lags: 12 The model fit (Prediction Errors) of the geostatistical model of the altitude of the water table were: Mean: -2.924 Root-Mean-Square: 146.5 Average Standard Error: 107.4 Mean Standardized: -0.01098 Root-Mean-Square Standardized: 1.059 20060313 Contours were generated from the raster data, using the ESRI ArcGIS ArcMap, Spatial Analyst Tools, Surface function, Contour. 20060313 Contours were clipped to the northern part of the study area to approximate the area with data points used to create the raster data. 20060313 The contour lines were exported to a coverage, using the ESRI ArcGIS ArcMap Conversion Tools Feature Class To Coverage command. 20060313 The coverage was edited using the ArcEdit extension of ESRI ArcGIS ArcInfo Workstation. Editing consisted of deleting small closed contours and contours not supported by nearby data points, and manually reshaping contours. 20060313 The edited coverage was exported to a shapefile and the contours were smoothed, using the ESRI ArcGIS Data Management Tools, Smooth function. 20060313 A line-type attribute was added to indicate index contours. 20060313 Vector String 29 Albers Conical Equal Area 37.500000 40.000000 -105.500000 37.000000 0.000000 0.000000 coordinate pair 0.000128 0.000128 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 sir-06-5129_alt_water_table_con Altitude of the long-term regional water table U.S. Geological Survey Scientific Investigations Report 2006-5129 FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. CONTOUR Line of equal altitude, evenly divisible by 200 USGS 6400 10000 feet, North American Vertical Datum 1988 (NAVD 88) index Contour type (index or intermediate) USGS 0 Intermediate contour USGS 1 Index contour, every fifth contour, evenly divisible by 1,000 USGS U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+sir-06-5129_alt_water_table_con Downloadable Data Although these data have 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. 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 these 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. other no compression applied 0.077 http://water.usgs.gov/GIS/dsdl/SIR-06-5129_alt_water_table_con.zip None. This dataset is provided by USGS as a public service. 20061013 20060922 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, as well as Environmental Systems Research, Inc. (ESRI) 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 and the Colorado Water Conservation Board would be appreciated in products derived from these data. Public Unclassified None http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile