Model Form #1
log10(FCBR) =
2.13 + 0.758 log10(TURB)
- 0.293 sin(2π D / 365)
- 0.529 cos(2π D / 365)
where:
- FCBR is computed fecal coliform bacteria, in colonies per 100 milliliters
- TURB is turbidity, YSI model 6136, in formazin nephelometric units
- D is day of year, in the range of integers 1 through 365
Model Archive Summary
The model archive summary for computed fecal coliform bacteria can be viewed in pdf form here.
Model Calibration
Basic Data
| Number of measurements: | 106 |
|---|---|
| Mean squared error: | 0.121104 |
| Multiple R2: | 0.695 |
| Bias correction (smearing) factor: | 1.38 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | 2.13 | 0.0686 | log10(TURB) | 0.758 | 0.0911 | sin(2π D / 365) | -0.293 | 0.0485 | cos(2π D / 365) | -0.529 | 0.0964 |
Correlation Matrix
| Intercept | log10(TURB) | sin(2π D / 365) | cos(2π D / 365) | |
|---|---|---|---|---|
| Intercept | 1 | -0.455 | -0.2108 | 0.4759 |
| log10(TURB) | -0.455 | 1 | -0.044 | 0.4233 |
| sin(2π D / 365) | -0.2108 | -0.044 | 1 | -0.214 |
| cos(2π D / 365) | 0.4759 | 0.4233 | -0.214 | 1 |
Reference
- Senior, L.A., 2017, Estimated fecal coliform bacteria concentrations using near real-time continuous water-quality and streamflow data from five stream sites in Chester County, Pennsylvania, 2007-16: U.S. Geological Survey Scientific Investigations Report 2017-5075, 46 p.
