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(TP) = - 0.426 + 0.0008 TURB + 0.0222 sin(2π D / 365) + 0.156 cos(2π D / 365)

where:

TP is computed total phosphorus, in milligrams per liter as phosphorus
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:	22
Mean squared error:	0.03345241
Multiple R²:	0.7
Bias correction (smearing) factor:	1.1

Explanatory Variables

Variable	Value	Standard error
Intercept	-0.426	0.0572
TURB	0.0008	0.0001
sin(2π D / 365)	0.0222	0.0635
cos(2π D / 365)	0.156	0.0656

Correlation Matrix

	Intercept	TURB	sin(2π D / 365)	cos(2π D / 365)
Intercept	1	-0.7396	0.3214	-0.3667
TURB	-0.7396	1	-0.4996	0.5803
sin(2π D / 365)	0.3214	-0.4996	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.