Distribution and mass of nitrate in the unconfined aquifer beneath the intensively cultivated area north of the Rio Grande, San Luis Valley, Colorado, 1997 through 2001

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Title Distribution and mass of nitrate in the unconfined aquifer beneath the intensively cultivated area north of the Rio Grande, San Luis Valley, Colorado, 1997 through 2001
Creator Stogner, Robert W., Sr.
Subject Water quality; Organic water pollutants; Aquifers; Groundwater
Spatial Coverage Rio Grande; Colorado River (Colo.-Mexico)
Description Current and historical nitrate-concentration and water-level data collected from wells completed in the unconfined aquifer in the intensively cultivated area north of the Rio Grande in south-central Colorado were used to determine the distribution and mass of nitrate and to determine short- and long-term trends in the concentration and mass of nitrate in the unconfined aquifer. The distribution of nitrate concentrations in the unconfined aquifer indicates that nitrate concentrations increased considerably between the 1940s and 1990s and were relatively stable between 1997 and 2001. However, evaluation of estimates of mass of nitrate indicated increases in the estimated mass of nitrate in the unconfined aquifer from the 1940s (6,900 tons) to the late 1960s (34,000 tons) to the late 1990s (75,000 tons). Trend analyses indicated no significant trend in annual estimates of the mass of nitrate during 1997 through 2001, averaging 75,000 tons. Ground-water samples collected from sel
Publisher U. S. Geological Survey
Contributors Rio Grande Water Conservation District; Colorado Department of Public Health and Environment
Date 2005
Type Text
Format application/pdf
Digitization Specifications pdf file copied from USGS website (http://water.usgs.gov/pubs/sir/2004/5290/). Uploaded into CONTENTdm version 3.7.
Identifier http://water.usgs.gov/pubs/sir/2004/5290/
Source Stogner, Robert W., Sr., Distribution and mass of nitrate in the unconfined aquifer beneath the intensively cultivated area north of the Rio Grande, San Luis Valley, Colorado, 1997 through 2001, Reston, Virginia: U.S. Geological Survey Scientific Investigations Report 2004-5290, 62 p.
Language eng
Rights Management Public Domain, Courtesy of the USGS
Holding Institution University of Utah
Metadata Cataloger Kristin Willmore
ARK ark:/87278/s6tm792f
Setname wwdl_er
Date Created 2005-08-23
Date Modified 2005-10-19
ID 1145838
Reference URL https://collections.lib.utah.edu/ark:/87278/s6tm792f
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