Intensive Survey of the Trinity River Segment 0805 July 1983
Davis, Jack R.
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An intensive water quality survey was conducted on the Trinity River (Segment 0805) on July 11-15, 1983. Twenty-six mainstream stations, nine tributary stations, and six dischargers were sampled. Stream width ranged from 11.6-33.5 m (38.1-109.9 ft.), discharge increased from 0.5381 m3/sec. (19.0 ft3/sec.) at the upstream end to 35.1168 m3/sec. (1239.6 ft.3/sec/) at the lower end, and flow velocity ranged from 0.1758-0.5287 m/sec/ (0.577-1.735 ft./sec.). Background water quality at Station 1 was high. Although worst-case water quality conditions were not existent due to the effects of a high flow event that preceded the survey, water quality was impacted through the nutrient concentrations, due primarily to the effects of several large municipal discharges. However, the minimum dissolved oxygen concentration (2.4 mg/L) was well above the 1.0 mg/L segment criterion, and chloride, sulfate,total dissolved solids, pH, fecal coliform, and temperature also conformed to segment criteria. Comparison to previous studies indicated slight water quality improvement since September and October, 1982, and considerable improvement since July, 1974, due primarily to a large reduction in BOD5 loading from the major dischargers.