As of June 30, 2010, water-quality data collection at this streamgage has been discontinued due to funding reductions from partner agencies. Although historic data will remain accessible, no new data will be collected unless one or more new funding partners are found. Users who can contribute funding for the non-Federal share of costs to continue operation of this water-quality streamgage should contact Brenda Majedi of the USGS Maryland, Delaware, DC, Water Science Center at 443-498-5527 or email blfeit@usgs.gov.
Model Form #1
log10(TP) =
- 2.1355 + 0.4591 log10(TURB)
+ 0.227 log10(Q)
where:
- TP is computed total phosphorus, in milligrams per liter as phosphorus
- TURB is turbidity, in formazin nephelometric units
- Q is computed discharge, stage-discharge rating curve, in cubic feet per second
Model Calibration
Basic Data
| Number of measurements: | 61 |
|---|---|
| Mean squared error: | 0.02859481 |
| Multiple R2: | 0.92 |
| Bias correction (smearing) factor: | 1.04 |
Explanatory Variables
| Variable | Value | Standard error |
|---|---|---|
| Intercept | -2.1355 | 0.0785 | log10(TURB) | 0.4591 | 0.0495 | log10(Q) | 0.227 | 0.0568 |
Correlation Matrix
| Intercept | log10(TURB) | log10(Q) | |
|---|---|---|---|
| Intercept | 1 | 0.4108 | -0.7893 |
| log10(TURB) | 0.4108 | 1 | -0.8669 |
| log10(Q) | -0.7893 | -0.8669 | 1 |
Reference
- Miller, C.V., Gutierrez-Magness, A.L., Feit Majedi, B.L., and Foster, G.D., 2007, Water quality in the Upper Anacostia River, Maryland: Continuous and discrete monitoring with simulations to estimate concentrations and yields: U.S. Geological Survey Scientific Investigations Report 2007-5142, 43 p.