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

DOP = 0.0074 + 0.0024 sin(4π D) - 0.0049 cos(4π D) + 0.002 TURB + 0.0006 TChl

where:

DOP is computed diss. orthophosphorus, 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
TChl is total chlorophyll, in micrograms per liter as chlorophyll

Model Calibration

Basic Data

Number of measurements:	15
Mean squared error:	1.444E-5
Multiple R²:	0.91
Bias correction (smearing) factor:	1

Explanatory Variables

Variable	Value	Standard error
Intercept	0.0074	0.0024
sin(4π D)	0.0024	0.0015
cos(4π D)	-0.0049	0.0015
TURB	0.002	0.0001
TChl	0.0006	0.0001

Correlation Matrix

	Intercept	sin(4π D)	cos(4π D)	TURB	TChl
Intercept	1	-0.1072	-0.4412	-0.3345	-0.6567
sin(4π D)	-0.1072	1	0.1755	-0.1433	0.1132
cos(4π D)	-0.4412	0.1755	1	0.0785	0.3495
TURB	-0.3345	-0.1433	0.0785	1	-0.3757
TChl	-0.6567	0.1132	0.3495	-0.3757	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 orthophosphorous.