Andrew Morita Dennis A. Clark Andrew Y. Morita Peter Martin 2007 vector digital data Reston, Virginia U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?anza_study_wells This digital data set contains the locations, water-level altitude, and water-level differences of 70 wells selected to document water-level changes between fall 2004 and spring 2005 in the Anza-Terwilliger area of Riverside County, California. The winter of 2005 was one of the wettest periods on record. Links to the U.S. Geological Survey National Water Information Systems Website (NWISWeb) have been established to interactively view recent water-level information via the internet by clicking on a specific well. This dataset represents well locations and water levels used to document water-level changes between the fall of 2004 and spring of 2005 for the Anza and Terwilliger area of Riverside County, California. USGS water-level data for this dataset collected for Anza-Terwilliger area in fall/winter 2004 and spring 2005, Riverside County, California". 200410 200505 ground condition Complete As needed -116.803944 -116.624364 33.583648 33.480553 none inlandWaters Water Level Changes U.S. Board of Geographic Names (BGN) and Geographic Names Information System (GNIS) Anza-Terwilliger Riverside County California None None Andrew Morita U.S. Geological Survey Geographer mailing address

4165 Spruance Road, Suite 200

San Diego California 92101 United States (619)225-6167 (619)225-6101 amorita@usgs.gov http://water.usgs.gov/GIS/browse/anza_study_wells.jpg Illlustration of data set jpg Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350 All measurements and locations of wells in this dataset have been through multiple checks to ensure accuracy of the data. Measurements using steel tape and electric tape require accuracy to 0.01 feet. WL_Change field in the attribute table are calculated values based on the difference in reported water-level values from the two time frames used in this data series (fall 2004 and spring 2005). A hyperlink has been created for use in ArcGIS, the lightning bolt icon may be selected and clicking on a well will direct you to the NWISWeb. Only sites in the Anza-Terwilliger region with water-level data in the specified time range were selected for use. Wells must have water-level data for both fall/winter 2004 and spring 2005. Wells must have water-level data for both fall/winter 2004 and spring 2005, not influenced by recent or current pumping were selected. All other wells that did not meet this requirement were omitted. A plot of the wells was overlaid on aerial photos and topographic sheets to verify well locations. U.S. Geological Survey 2005 http://waterdata.usgs.gov/nwis online 2005 ground condition wlchange_wells83 U.S. Geological Survey Wells located in the Anza and Terwilliger area with water-level data for both fall or winter 2004 as well as spring 2005 were selected for use in this study. Water-level data was acquired via NWIS (National Water Information System) on May 23, 2006. After carefull screening, only wells that were measured and found not to be affected by current or recent pumping were selected to be used in this dataset. Other sites were omitted because of unstable or biased water-level values due to recent events. In the event where a site had multiple measurements taken within the targeted time range, the most recent measurement was used for the purpose of this study. Water-level data from fall/winter 2004 was subtracted from spring 2005 data to populate the WL_Change (water level change) field in the attribute table, units in feet. 20060609 0835 Andrew Morita U.S. Geological Survey Geographer mailing address

4165 Spruance Road, Suite 200

San Diego California 92101 United States (619)225-6167 (619)225-6101 amorita@usgs.gov Vector Entity point 70 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000032 0.000032 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 Anza_study_wells Identifies waterlevel changes between fall 2004 and spring 2005. USGS FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. SITEID USGS Station number USGS Unique value used to idenify individual water-levels WELLNUM USGS local well number USGS Unique value used to identify individual wells WELL_ID Truncated well identification USGS Unique value used to identify individual wells, truncated from WellNum field ALT Altitude of well to National Geodetic Vertical Datum (NGVD) 1929. USGS 3380 4450 Feet LATITUDE Latitude of well in Decimal Degrees USGS 33.480722 33.583472 Decimal degrees (latitude) LONGITUDE Longitude of well in Decimal Degrees USGS -116.624487 -116.803844 Decimal Degrees (longitude) WL_CHANGE Amount of water level change in feet, 2004-2005 values USGS -3.42 23.69 Feet 200410 200505 Hyperlink Provides a link to online waterlevel data USGS hyperlink U.S. Geological Survey Earth Science Information Center (ESIC) 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 Downloadable Data Although these data have been processed successfully on a computer system at the U.S. Geolocal Survey, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is stronly recommended that these data are directly acquired from a U.S. Geological Survey server, and not indireclty through other sources which may have changed the data in some way. It is also stronly recommended that careful attention be paid to the contents of the metadata file associated with these data. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to documnet the data set in nonproprietary form, as well as in ARC/INFO format, this metadata file may include some ARC/INFO-specific terminology. SHP 9.1 ESRI Shapefile no compression applied 0.002 http://water.usgs.gov/GIS/dsdl/anza_study_wells.zip none Contact distributor 20071203 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+anza_study_wells FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998