Kansas Real-Time Water Quality

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

Model Form #3

log₁₀(As) = 0.90451 - 0.22085 log₁₀(Q) + 0.01336 TEMP

where:

As is computed arsenic, in micrograms per liter as arsenic
Q is computed discharge, stage-discharge rating curve, in cubic feet per second
TEMP is water temperature, in degrees Celsius

Model Archive Summary

The model archive summary for computed arsenic can be viewed in pdf form here.

Model Calibration

Basic Data

Number of measurements:	163
Mean squared error:	0.01352569
Multiple R²:	0.79
Bias correction (smearing) factor:	1.04

Explanatory Variables

Variable	Value	Standard error
Intercept	0.90451	0.029725
log₁₀(Q)	-0.22085	0.01004
TEMP	0.01336	0.001175

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.

Reference

Stone, M.L., and Klager, B.J., 2022, Documentation of models describing relations between continuous real-time and discrete water-quality constituents in the Little Arkansas River, south-central Kansas, 1998-2019: U.S. Geological Survey Open-File Report 2022-1010, 34 p.

Notes

Model derived using Tobit regression estimation (absolute maximum likelihood estimation) approach.