Models also were developed for five new constituents, including additional nutrient species and indicator bacteria. This report updates those models using discrete and continuous data collected during January 1999 through December 2009. Regression models were published in 2006 that were based on a different dataset collected during 1997 through 2003. Regression models were developed to establish relations between discretely sampled constituent concentrations and continuously measured physical properties to estimate concentrations of those constituents of interest that are not easily measured in real time because of limitations in sensor technology and fiscal constraints. ![]() Discrete water-quality samples were collected during 1999 through 2009 and analyzed for sediment, nutrients, bacteria, and other water-quality constituents. Continuously measured water-quality physical properties include streamflow, specific conductance, pH, water temperature, dissolved oxygen, and turbidity. Geological Survey has operated a continuous real-time water-quality monitoring station since 1998 on the North Fork Ninnescah River. The North Fork Ninnescah River is the largest contributing tributary to Cheney Reservoir. ![]() Cheney Reservoir in south-central Kansas is one of the primary sources of water for the city of Wichita.
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