Model Form #1
log10(FCBR) =
1.68 + 0.879 log10(TURB)
- 0.444 sin(2π D / 365)
- 0.638 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: | 102 |
|---|---|
| Mean squared error: | 0.143641 |
| Multiple R2: | 0.708 |
| Bias correction (smearing) factor: | 1.45 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | 1.68 | 0.0705 | log10(TURB) | 0.879 | 0.095 | sin(2π D / 365) | -0.444 | 0.0533 | cos(2π D / 365) | -0.638 | 0.1 |
Correlation Matrix
| Intercept | log10(TURB) | sin(2π D / 365) | cos(2π D / 365) | |
|---|---|---|---|---|
| Intercept | 1 | -0.4058 | -0.1071 | 0.6108 |
| log10(TURB) | -0.4058 | 1 | -0.2509 | 0.2592 |
| sin(2π D / 365) | -0.1071 | -0.2509 | 1 | -0.2704 |
| cos(2π D / 365) | 0.6108 | 0.2592 | -0.2704 | 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.