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Water quality in the Trinity River basin, Texas, 1992-95

Larry F. Land·J. Bruce Moring·Peter C. Van Metre·David C. Reutter·Barbara Mahler·Allison A. Shipp·Randy L. Ulery
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Abstract

Water quality in the Trinity River basin was studied during 1992-95 as part of the USGS National Water-Quality Assessment (NAWQA) Program. Studies included chemical sampling of streams, streambed sediments, biota, and ground water; measuring distributions of biological communities in streams; and measuring physical characteristics of streams that affect biological habitat. The sampling design, in general, relates water-quality conditions to causative human and natural environmental factors. The occurrence of pesticides, for example, is related to land use. Trends are mixed, with a substantial improvement in the diversity of fish species downstream from Dallas and large decreases in regulated contaminants such as DDT; but increases in unregulated contaminants such as polychlorinated biphenyls.

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90° N90° S · 180° W ← longitude → 180° E
Source-reported bounding extent: 28.420391085674304° to 34.56085936708384° latitude; -99.4482421875° to -93.779296875° longitude. This indicates report coverage, not an exact sampling location. View area on OpenStreetMap.

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Larry F. Land, J. Bruce Moring, Peter C. Van Metre, David C. Reutter, Barbara Mahler, Allison A. Shipp, Randy L. Ulery. 1999. Water quality in the Trinity River basin, Texas, 1992-95. https://doi.org/10.3133/cir1171

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