Kansas Real-Time Water Quality

Kansas Real-Time Water Quality

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USGS station:	Go to NWISWeb
Constituent:
Time period:
Model Form:

Model Form #1

log₁₀(TRI) = 1.89 - 0.699 log₁₀(SC) - 0.239 cos(2π D / 365) - 0.0098 sin(2π D / 365)

where:

TRI is computed triazines, in micrograms per liter
SC is specific conductance at 25 degrees Celsius, in microsiemens per centimeter
D is day of year, in the range of integers 1 through 365

Model Calibration

Basic Data

Number of measurements:	41
Mean squared error:	0.07963684
Multiple R²:	0.5
Bias correction (smearing) factor:	1.24

Explanatory Variables

Variable	Value	Standard error
Intercept	1.89	0.8045
log₁₀(SC)	-0.699	0.2788
cos(2π D / 365)	-0.239	0.07
sin(2π D / 365)	-0.0098	0.0772

Correlation Matrix

	Intercept	log₁₀(SC)	cos(2π D / 365)	sin(2π D / 365)
Intercept	1	-0.9984	-0.4404	0.5704
log₁₀(SC)	-0.9984	1	0.4371	-0.5596
cos(2π D / 365)	-0.4404	0.4371	1	-0.2822
sin(2π D / 365)	0.5704	-0.5596	-0.2822	1

Reference

Rasmussen, T.J., Ziegler, A.C., and Rasmussen, P.P., 2005, Estimation of Constituent Concentrations, Densities, Loads, and Yields in Lower Kansas River, Northeast Kansas, Using Regression Models and Continuous Water-Quality Monitoring, January 2000 Through December 2003: U.S. Geological Survey Scientific Investigations Report 2005-5165, 117 p.