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Evaluating regional trends in ground-water nitrate concentrations of the Columbia Basin ground water management area, Washington

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Evaluating regional trends in ground-water nitrate concentrations of the Columbia Basin ground water management area, Washington; 2005; SIR; 2005-5078; Frans, Lonna M.; Helsel, Dennis R.

Summary

Trends in nitrate concentrations in water from 474 wells in 17 subregions in the Columbia Basin Ground Water Management Area (GWMA) in three counties in eastern Washington were evaluated using a variety of statistical techniques, including the Friedman test and the Kendall test. The Kendall test was modified from its typical 'seasonal' version into a 'regional' version by using well locations in place of seasons. No statistically significant trends in nitrate concentrations were identified in samples from wells in the GWMA, the three counties, or the 17 subregions from 1998 to 2002 when all data were included in the analysis. For wells in which nitrate concentrations were greater than 10 milligrams per liter (mg/L), however, a significant [...]

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Type Scheme Key
local-index unknown sir20055078
local-pk unknown 70467
doi http://www.loc.gov/standards/mods/mods-outline-3-5.html#identifier doi:10.3133/sir20055078
series unknown Scientific Investigations Report

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citationTypeReport
edition-
journalScientific Investigations Report
languageENGLISH

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