Kansas Real-Time Water Quality

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

Funding to maintain the continuous water-quality monitor at this site ended on December 31, 2005.

Model Form #1

TIN = - 1.638 + 0.026 TURB + 0.0039 SC - 0.0278 TEMP

where:

TIN is computed diss. nitrate + nitrite, in milligrams per liter as nitrogen
TURB is turbidity, YSI model 6136, in formazin nephelometric units
SC is specific conductance at 25 degrees Celsius, in microsiemens per centimeter
TEMP is water temperature, in degrees Celsius

Model Calibration

Basic Data

Number of measurements:	15
Mean squared error:	0.042849
Multiple R²:	0.94
Bias correction (smearing) factor:	1

Explanatory Variables

Variable	Value	Standard error
Intercept	-1.638	0.5153
TURB	0.026	0.0032
SC	0.0039	0.0008
TEMP	-0.0278	0.0079

Correlation Matrix

	Intercept	TURB	SC	TEMP
Intercept	1	-0.0908	-0.9518	-0.7682
TURB	-0.0908	1	-0.088	0.018
SC	-0.9518	-0.088	1	0.6024
TEMP	-0.7682	0.018	0.6024	1

Reference

Mau, D.P., Ziegler, A.C., Porter, S.D., and Pope, L.M., 2004, Surface-Water-Quality Conditions and Relation to Taste-and-Odor Occurrences in the Lake Olathe Watershed, Northeast Kansas, 2000-02: U.S. Geological Survey Scientific Investigations Report 2004-5047, 95 p.

Notes

Model assumes the same turbidity sensor is being used over all time, but that is not the case. Starting in 2005, this station switched from a YSI 6026 to a 6136, whose measurements typically are only about 2/3 of the 6026's. Thus, for 2005, this model will underestimate dissolved nitrate plus nitrite.