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.