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Colorado Real-time Water Quality Surrogates

USGS station:

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Constituent:
Time period:
Model Form:

At this site, real-time estimates of water quality depend on the availability of instantaneous discharge and specific conductivity measurements. During winter months, real-time water quality estimates may not be available for this site due to effects of ice.

Model Form #1

ln(Se) = - 7.868 + 1.4053 ln(SC) + 0.0418 sin(2π D / 365) + 0.1408 cos(2π D / 365)

where:

Model Calibration

Basic Data

Number of measurements: 16
Mean squared error: 0.01734489
Multiple R2: 0.909488
Bias correction (smearing) factor: 1.006

Explanatory Variables

VariableValueStandard error
Intercept-7.8681.2724
ln(SC) 1.40530.192
sin(2π D / 365) 0.04180.066
cos(2π D / 365) 0.14080.0619

Correlation Matrix

Interceptln(SC) sin(2π D / 365) cos(2π D / 365)
Intercept1-0.9996-0.73750.5787
ln(SC) -0.999610.7351-0.575
sin(2π D / 365) -0.73750.73511-0.4884
cos(2π D / 365) 0.5787-0.575-0.48841

Reference

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URL: http://nrtwq.usgs.gov/explore/modelinfo?site_no=09152500&pcode=01145&period=ytd_all&timestep=uv
Page Contact Information: National Real-Time Water Quality Information
Page Last Modified: Wed 06 October 2010