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 #1

log₁₀(ECB) = 1.4261 - 0.6077 sin(2π D / 365) - 0.3858 cos(2π D / 365) + 1.1773 log₁₀(TURB)

where:

ECB is computed e. coli, in most probable number
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:	18
Mean squared error:	0.2304
Multiple R²:	0.8436
Bias correction (smearing) factor:	1.5728

Explanatory Variables

Variable	Value	Standard error
Intercept	1.4261	0.2425
sin(2π D / 365)	-0.6077	0.2002
cos(2π D / 365)	-0.3858	0.1599
log₁₀(TURB)	1.1773	0.1394

Correlation Matrix

	Intercept	sin(2π D / 365)	cos(2π D / 365)	log₁₀(TURB)
Intercept	1	0.0269	0.1675	-0.8388
sin(2π D / 365)	0.0269	1	0.0474	-0.3103
cos(2π D / 365)	0.1675	0.0474	1	-0.0484
log₁₀(TURB)	-0.8388	-0.3103	-0.0484	1

Reference

Stone, M.L., and Graham, J.L., 2014, Model Documentation for Relations Between Continuous Real-Time and Discrete Water-Quality Constituents in Indian Creek, Johnson County, Kansas, June 2004 through May 2013: U.S. Geological Survey Open-File Report 2014-1170, 70 p.