Model Form #1
log10(TNR) =
- 0.27 + 0.0438 log10(Q)
+ 0.444 sqrt(NN)
where:
- TNR is computed total nitrogen, in milligrams per liter as nitrogen
- Q is computed discharge, stage-discharge rating curve, in cubic feet per second
- NN is nitrate plus nitrite, in milligrams per liter as N
Model Archive Summary
The model archive summary for computed total nitrogen can be viewed in pdf form here.
Model Calibration
Basic Data
| Number of measurements: | 44 |
|---|---|
| Mean squared error: | 0.00194481 |
| Multiple R2: | 0.975 |
| Bias correction (smearing) factor: | 1 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -0.27 | 0.0215 | log10(Q) | 0.0438 | 0.0079 | sqrt(NN) | 0.444 | 0.0128 |
Correlation Matrix
| Intercept | log10(Q) | sqrt(NN) | |
|---|---|---|---|
| Intercept | 1 | 0.1555 | -0.9272 |
| log10(Q) | 0.1555 | 1 | -0.3789 |
| sqrt(NN) | -0.9272 | -0.3789 | 1 |
Reference
- Downhour, M.S., Bunch, A.R., and Lathrop, T.R., 2021, Regression models for estimating sediment, nutrient concentrations and loads at School Branch at Brownsburg, Indiana, June 2015 through February 2019: U.S. Geological Survey Scientific Investigations Report 2021-5099, 15 p.