water quality monitoring, Arkansas, watershed monitoring
The Arkansas Water Resources Center monitored water quality at seven sites in the Upper White River Basin during base flow conditions and storm events from July 1, 2009 through June 30, 2010. Water samples were collected manually with an alpha or Kemmerer style sampler and analyzed for nitrate‐nitrogen (NO₃‐N), sulfate (SO₄), chloride (Cl‐), soluble reactive phosphorus (SRP), total phosphorus (TP), dissolved ammonia (NH₃‐N), total N (TN), total suspended solids (TSS), and turbidity. Physico‐chemical parameters were measured in field including pH, conductivity, water temperature, and dissolved oxygen concentration. The selected sites were all at established discharge monitoring stations maintained by the US Geological Survey, and constituent loads were determined using regression models between constituent concentrations, discharge, and seasonal factors to estimate daily loads, which were then summed to produce monthly, seasonal and annual load estimates. The constituent loads and annual flow‐weighted concentrations for the 2009 calendar year are summarized in the table below, using the data collected in this study. The regression models were applied throughout the calendar year discharge record to estimate constituent loads for individual sites.
Massey, L.B.; Haggard, B.E.; Avery, R.S.; and Morgan, R.A.. 2010. Water Quality Monitoring and Constituent Load Estimation in the Upper White River Basin, 2009. Arkansas Water Resource Center, Fayetteville, AR. MSC362. 40