Water Quality Monitoring and Constituent Load Estimation in the Kings River near Berryville, Arkansas, 2009

The Arkansas Water Resources Center monitored water quality at the Kings River near Berryville, Arkansas, 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 site was at an established discharge monitoring station maintained by the US Geological Survey, and total annual discharge was 825,848,000 m₃. 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 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. Semi‐annual loads from 1 January to 30 June 2010 are also summarized