U.S. Geological Survey Circular, Issue 1173

alkalinity anions Arkansas bedrock Benchmark Network Stations calcium Celsius Characteristics and Water coefficients rho values constituents from surface-water Cossatot River Creek Basin Department of Agriculture Devils River discharge and unadjusted dissolved constituents measured Dry Prong Environmental Characteristics field pH flow-adjusted pH gaging station HBN station Hydrologic Benchmark Network ion balance Kawishiwi River Kiamichi River LOWESS curve m³/s magnesium major dissolved constituents measured in water-quality median meters per second MICROEQUIVALENTS PER LITER micromoles per liter Minnesota NADP NADP station Nitrite plus nitrate p-value percent period of record physical properties Popple River potassium precipitation chemistry properties and major Quality of Hydrologic quartile relation among discharge SAN DIEGO seasonal Kendall test silica silica in micromoles sodium specific conductance stream water sulfate sulfate concentrations surface-water sampling sites test for trends third quartile trends in discharge U.S. Department U.S. Geological Survey unadjusted and flow-adjusted volume-weighted mean concentrations Water Quality water-quality samples Whitewater River µeq/L