USGS - science for a changing world

Kansas Real-Time Water Quality

USGS station:

opens this link in a new window Go to NWISWeb
Time period:
Model Form:

Model Form #3

TIN = 0.533 + 0.000399 SC + 0.0224 sin(2π D) + 0.563 cos(2π D)


Model Archive Summary

The model archive summary for computed diss. nitrate + nitrite can be viewed in pdf form here.

Model Calibration

Basic Data

Number of measurements: 123
Mean squared error: 0.09603801
Multiple R2: 0.6
Bias correction (smearing) factor: 1

Explanatory Variables

VariableValueStandard error
SC 0.0003990.00008143
sin(2π D) 0.02240.03981
cos(2π D) 0.5630.05281

Correlation Matrix

A correlation matrix is not available for this model. Therefore, the prediction interval was calculated by assuming that there is no correlation between the explanatory variables.



Model derived using Tobit regression estimation (absolute maximum likelihood estimation) approach. Regression models were updated in Kramer and others (2021) and the newest version of the model was applied beginning January 1, 2017. Computations using the previous version of the model (Stone and others, 2012) ended in 2016. More information detailing models, period of application, and computed concentrations can be found in Kramer and others (2021).

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: National Real-Time Water Quality Information
Page Last Modified: Wed 06 October 2010