2.1 Development of Flow, Sediment and Metals Historical Dataset
Historical trace metal concentrations, TSS and grain size distribution data for sediments within the study area were acquired from the Texas Commission on Environmental Quality (TCEQ) Surface Water Quality Web Reporting Tool (TCEQ, 2020). WQM stations were selected based on data availability for the period from 1997 to 2017 for metals and 2000-2020 for TSS and sediment. Historical metals data were very limited; for sites with no data, upstream and downstream sites were used as an alternate. Flow data were collected from the United States Geological Survey (USGS) flow gages (https://waterdata.usgs.gov/nwis/rt) for the period of 1995-2020.