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

Water-Resources Investigations Report 85-4318

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Abstract

Hydrologic Accounting Unit 120301 is located in north-central Texas and includes that part of the Trinity River basin upstream from the National Stream Quality Accounting Network station 08062700, Trinity River at Trinidad, Texas. Normal annual precipitation ranges from about 28 in in the western part of the basin to almost 40 inches in the eastern part. Mean discharges for most stations in the study area during the 1973-82 water years were significantly larger than mean discharges for the period of record. Mean discharges throughout most of the study area during the 1982 water year were more than 300% of the long-term mean flow. Water in the upper Trinity River basin upstream of the Dallas-Fort Worth metroplex is generally a calcium bicarbonate type water. Average dissolved solids (DS) concentrations during the study period ranged from 174 mg/L in the Elm Fork Trinity River near Lewisville to 682 mg/L in Mountain Creek near Cedar Hill. Discharge weighted average (DS) concentrations during 1973-82 water years ranged from 165 mg/L in the Elm Fork Trinity River near Lewisville to 416 mg/L at Mountain Creek near Cedar Hill. Upstream of the municipal waste effluents in the Dallas-Fort Worth metroplex, average dissolved oxygen (DO) concentrations generally exceed 7.0 mg/L, average DO percent saturation values generally exceed 70%, and average biochemical oxygen demand (BOD) concentrations generally were < 4.0 mg/L. Downstream of the municipal waste effluents, average DO concentrations generally did not exceed 5.0 mg/L, average DO percent-saturation values generally were < 50%, and average biochemical oxygen demand concentrations generally were > 12.0 mg/L. Average concentrations of total nitrogen and total phosphorus increase significantly downstream of municipal waste effluents in the Dallas-Fort Worth metroplex. Lead has been detected in excess of the 50 micrograms/L maximum contaminant level, and iron has been detected in excess of the 300 micrograms secondary maximum contaminant level at two sites on streams in the study area. (Lantz-PTT)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Areal and temporal variations in the quality of surface water in hydrologic accounting unit 120301, Upper Trinity River basin, Texas
Series title:
Water-Resources Investigations Report
Series number:
85-4318
Edition:
-
Year Published:
1986
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
ix, 135 p. :ill., maps ;28 cm.