Water-Resources Investigations Report 01-4239

Ground-Water Discharge Determined from Measurements of Evapotranspiration,
Other Available Hydrologic Components, and Shallow Water-Level Changes,
Oasis Valley, Nye County, Nevada

Table 8. Characteristics of spring and channel sites used to measure discharge, Oasis Valley discharge area, Nevada, 1997-99

USGS site identification (ID): The standard site identification is based on the grid system of latitude and longitude. The number consists of 15 digits. The first six denote the degrees, minutes, and seconds of latitude; the next seven denote the degrees, minutes, and seconds of longitude; and the last two digits (assigned sequentially) identify the sites within a 1-second grid. For example, site 365827116431601 is at 36° 58' 27" N latitude and 116° 43' 16" W longitude, and is the first site recorded in that 1-second grid. The assigned number is retained as a permanent identifier even if a more precise latitude and longitude are determined.

Local site number: A local site identification is used in Nevada to identify a site by hydrographic area (Rush, 1968) and by the official rectangular subdivision of the public lands referenced to the Mount Diablo base line and meridian. Each site designation consists of four units: The first unit is the hydrographic area number. The second unit is the township, preceded by an N or S to indicate location north or south of the base line. The third unit is the range, preceded by an E to indicate location east of the meridian. The fourth unit consists of the section number and letters designating the quarter section, quarter-quarter section, and so on (A, B, C, and D indicate the northeast, northwest, southwest, and southeast quarters, respectively), followed by a number indicating the sequence in which the site was recorded. For example, site 228 S11 E47 16DCDB 3 is in the Oasis Valley (Hydrographic Area 228). It is the third site recorded in the nothwest quarter of the southeast quarter of the southwest quarter of the southeast quarter of section 16, township 11 south, range 47 east, Mount Diablo base line and meridian.

Land-surface altitude: Datum is sea level. Altitudes are reported to nearest foot and were estimated from U.S. Geological Survey 1:24,000-scale topographic maps.

Site type: S, discharge of single spring measured; C, discharge of channel, which includes contributions from nearby springs, seeps, and shallow ground-water inflow, measured.