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 #2

log₁₀(TRI) = - 0.307 + 0.328 log₁₀(Q) - 0.438 log₁₀(TEMP) + 0.0906 sin(2π D / 365) - 0.678 cos(2π D / 365)

where:

TRI is computed triazines, in micrograms per liter
Q is computed discharge, stage-discharge rating curve, in cubic feet per second
TEMP is water temperature, in degrees Celsius
D is day of year, in the range of integers 1 through 365

Model Calibration

Basic Data

Number of measurements:	43
Mean squared error:	0.217156
Multiple R²:	0.599
Bias correction (smearing) factor:	1.6

Explanatory Variables

Variable	Value	Standard error
Intercept	-0.307	0.318
log₁₀(Q)	0.328	0.0942
log₁₀(TEMP)	-0.438	0.236
sin(2π D / 365)	0.0906	0.118
cos(2π D / 365)	-0.678	0.189

Correlation Matrix

	Intercept	log₁₀(Q)	log₁₀(TEMP)	sin(2π D / 365)	cos(2π D / 365)
Intercept	1	-0.724	-0.751	0.0571	-0.734
log₁₀(Q)	-0.724	1	0.153	-0.288	0.356
log₁₀(TEMP)	-0.751	0.153	1	0.0872	0.82
sin(2π D / 365)	0.0571	-0.288	0.0872	1	0.0323
cos(2π D / 365)	-0.734	0.356	0.82	0.0323	1

Reference

King, A.S., Rasmussen, P.P., and Ziegler, A.C., 2012, Use of regression analysis and continuous real-time water-quality monitoring to compute constituent concentrations, loads, and yields in the Little Arkansas River, south-central Kansas, 1995-2011: U.S. Geological Survey Scientific Investigations Report 2012-XXXX, XX pp.