Kansas Real-Time Water Quality

Kansas Real-Time Water Quality

NRTWQ Home >> Kansas >> View Data >> 07143672

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

Model Form #1

log₁₀(ATR) = 0.4297 - 0.6431 cos(2π D / 365) + 0.3586 sin(2π D / 365) - 0.00079 SC

where:

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

Model Calibration

Basic Data

Number of measurements:	78
Mean squared error:	0.32638369
Multiple R²:	0.5523
Bias correction (smearing) factor:	1.80644

Explanatory Variables

Variable	Value	Standard error
Intercept	0.4297	0.1574
cos(2π D / 365)	-0.6431	0.1199
sin(2π D / 365)	0.3586	0.1054
SC	-0.00079	0.0001

Correlation Matrix

	Intercept	cos(2π D / 365)	sin(2π D / 365)	SC
Intercept	1	0.6148	0.0787	-0.8317
cos(2π D / 365)	0.6148	1	0.0715	-0.3353
sin(2π D / 365)	0.0787	0.0715	1	-0.2262
SC	-0.8317	-0.3353	-0.2262	1

Reference

Christensen, V.G., Ziegler, A.C., Rasmussen, P.P., and Jian, Xiaodong, 2003, Continuous Real-Time Water-Quality Monitoring of Kansas Streams, in Proceedings of 2003 Spring Specialty Conference on Agricultural Hydrology and Water Quality, May 12-14, 2003, Kansas City, Missouri: Middleburg, Virginia, American Water Resources Association, AWRA Technical Publication Series No. TPS-03-1, compact disc.

Notes

Old model used through 2006.