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Summary of statistical and trend analyses of selected water-quality data collected near the Big Thicket National Preserve, southeast Texas

January 1, 1994

Statistical and trend analyses of selected water-quality data collected at three streamflow stations in the lower Neches River basin, Texas, are summarized in order to document baseline water-quality conditions in stream segments that flow through the Big Thicket National Preserve in southeast Texas. Dissolved-solids concentrations in the streams are small, less than 132 milligrams per liter in 50 percent of the samples analyzed from each of the sites. Dissolved-oxygen concentrations in the Neches River at Evadale (08041000) generally are large, exceeding 8.0 milligrams per liter in more than 50 percent of the samples analyzed. Total nitrogen and total phosphorus concentrations in samples from this site have not exceeded 1.8 milligrams per liter and 0.20 milligram per liter, respectively.

Trend tests for dissolved solids and major ions indicate that small downtrends in total alkalinity, dissolved calcium, and hardness occurred in the Meches River at Evadale (08041000) and Pine Island Bayou near Sour Lake (08041700). Small uptrends in dissolved sulfate were detected at all three stations in the study area.

Citation Information

Publication Year 1985
Title Summary of statistical and trend analyses of selected water-quality data collected near the Big Thicket National Preserve, southeast Texas
DOI 10.3133/ofr85183
Authors Frank C. Wells, Kristin C. Bourdon
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 85-183
Index ID ofr85183
Record Source USGS Publications Warehouse
USGS Organization Texas Water Science Center