Quality of surface waters in the Colorado River basin, Texas, 1966-72 water years

Areal and temporal variations in the quality of surface water in hydrologic accounting unit 120301, Upper Trinity River basin, Texas

“…As part of a statewide study, these water-quality data collected for principal streams in the Trinity River basin through the 1972 water year were summarized by Rawson (1974).…”

“…To supplement this information, the water-qual ity sampling program by the Geological Survey in cooperation with State, Federal, and local agencies was expanded to include the periodic determination of biochemical oxygen demand (BOD), dissolved oxygen (DO), macronutrients (total nitrogen and phosphorus), and minor elements for selected sites on many of the major streams and reservoirs (Rawson, 1974). Sampling for these parameters or constituents at most sites in the upper Trinity River basin was begun after 1972.…”