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 #3

log₁₀(TP) = - 1.6052 - 0.0633 sin(2π D / 365) - 0.1357 cos(2π D / 365) + 0.439 log₁₀(TURB)

where:

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

Model Calibration

Basic Data

Number of measurements:	109
Mean squared error:	0.01860496
Multiple R²:	0.69
Bias correction (smearing) factor:	1.0477

Explanatory Variables

Variable	Value	Standard error
Intercept	-1.6052	0.0618
sin(2π D / 365)	-0.0633	0.019
cos(2π D / 365)	-0.1357	0.0218
log₁₀(TURB)	0.439	0.052

Correlation Matrix

	Intercept	sin(2π D / 365)	cos(2π D / 365)	log₁₀(TURB)
Intercept	1	-0.2424	-0.3435	-0.9747
sin(2π D / 365)	-0.2424	1	-0.0018	0.2411
cos(2π D / 365)	-0.3435	-0.0018	1	0.4197
log₁₀(TURB)	-0.9747	0.2411	0.4197	1

Reference

Stone, M.L., Graham, J.L., and Gatotho, J.W., 2013, Model Documentation for Relations Between Continuous Real-Time and Discrete Water-Quality Constituents in Cheney Reservoir near Cheney, Kansas, 2001-2009: U.S. Geological Survey Open File Report 2013-1123, 100 p.