Salinity and selenium yield maps derived from geostatistical modeling in the lower Gunnison River Basin, western Colorado, 1992–2013

Abstract

Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD88).Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD83).Elevation, as used in this report, refers to distance above the vertical datum. Supplemental InformationConcentrations of chemical constituents in water are given in either milligrams per liter (mg/L) or micrograms per liter (µg/L).As used in this report, load relates the mass of a constituent for a specified unit of time. Load is specified for annual or seasonal time periods and reported as the mean in tons per day for salinity (total dissolved solids) and pounds per day for selenium.As used in this report, yield is mass per time per unit of area. Yield of salinity (total dissolved solids) is in units of tons per year per acre, and selenium yield is in units of pounds per day per acre.The water year is defined as the 12-month period from October 1 through September 30. The water year is designated by the calendar year in which it ends. Thus, the year ending