Surface water quality monitoring in Lower Leon Creek, San Antonio, Texas




Ramos Velasquez, Ana Carolina

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In 1999, the Lower Leon Creek Segment 1906 was identified as having dissolved oxygen (DO) concentrations lower than the standard established to assure optimum conditions for aquatic life by the Texas Commission on Environmental Quality. Four monitoring stations of Segment 1906 were observed for water quality indicators during a period of eight months, January to August. Water indicator data was extracted In-Situ and in laboratory for the four stations (14198, 12843, 12838, and 14209). In-Situ data included: Water Temperature, Conductivity, pH, Water Flow, and 24-Hr DO. Laboratory data extracted included Alkalinity, Hardness, Total Coliform, Fecal Coliform, Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), and Metals. With this data it is possible to identify trends in water quality parameters between the different stations, verify if the observed parameters meet the criterion of water quality for aquatic life on surface water, identify associations between parameters that did not meet the water quality criteria, develop a Water Quality Index to analyze data and express conditions of the Segment.


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Leon Creek, TCEQ, water monitoring, water quality, water quality index, water resources



Civil and Environmental Engineering