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(TN) = 0.296 + 0.0006 TURB + 0.0483 sin(2π D / 365) + 0.2205 cos(2π D / 365)

where:

TN is computed total nitrogen, in milligrams per liter as nitrogen
TURB is turbidity, YSI model 6136, in formazin nephelometric units
D is day of year, in the range of integers 1 through 365

Model Calibration

Basic Data

Number of measurements:	23
Mean squared error:	0.03504384
Multiple R²:	0.61
Bias correction (smearing) factor:	1.09

Explanatory Variables

Variable	Value	Standard error
Intercept	0.296	0.0585
TURB	0.0006	0.0001
sin(2π D / 365)	0.0483	0.0649
cos(2π D / 365)	0.2205	0.0671

Correlation Matrix

	Intercept	TURB	sin(2π D / 365)	cos(2π D / 365)
Intercept	1	-0.7396	0.3214	0.3667
TURB	-0.7396	1	-0.4966	0.5803
sin(2π D / 365)	0.3214	-0.4966	1	-0.3202
cos(2π D / 365)	0.3667	0.5803	-0.3202	1

Reference

Rasmussen, T.J., Lee, C.J., and Ziegler, A.C., 2008, Estimation of Constituent Concentrations, Loads, and Yields in Streams of Johnson County, Northeast Kansas, Using Continuous Water-Quality Monitoring and Regression Models, October 2002 through December 2006: U.S. Geological Survey Scientific Investigations Report 2008-5014, 103 p.