Water Resources, is investigating land subsidence in Las Vegas, Nevada. As part of this study, groundwater levels and aquifer-system compaction are monitored at the Lorenzi site in northwest Las Vegas. The site is near 14 LVVWD wells used to pump ground water during periods of high water demand (May through September) and to provide artificial recharge during the remainder of the year. The data are used to determine relations between wells. Declining water levels and increased compaction rates correspond to periods of groundwater pumpage. Rising water levels and reduced rates of compaction (or temporary aquifer-system expansion) correspond to periods of artificial recharge. From November 1994 through December 1999, a maximum of 1.0327 inches of aquifer-system compaction occurred at the Lorenzi site. The average annual aquifer-system compaction was about 0.2000 inch.

Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29). Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83). Altitude, as used in this report, refers to distance above the vertical datum.

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Walker Lake is a threatened and federally protected desert terminal lake in western Nevada. To help protect the desert terminal lake and the surrounding watershed, the Bureau of Reclamation and U.S. Geological Survey have been studying the hydrology of the Walker River Basin in Nevada and California since 2004. Hydrologic data collected for this study during water years 2010 through 2014 included groundwater levels, surface-water discharge, water chemistry, and meteorological data. Groundwater levels were measured in wells, and surface-water discharge was measured in streams, canals, and ditches. Water samples for chemical analyses were collected from wells, streams, springs, and Walker Lake. Chemical analyses included determining physical properties; the concentrations of major ions, nutrients, trace metals, dissolved gases, and radionuclides; and ratios of the stable isotopes of hydrogen and oxygen. Walker Lake water properties and meteorological parameters were monitored from a floating platform on the lake. Data collection methods followed established U.S. Geological Survey guidelines, and all data are stored in the National Water Information System database. All of the data are presented in this report and accessible on the internet, except multiple-depth Walker Lake water-chemistry data, which are available only in this report.

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