Maryland Real-Time Water Quality

Maryland Real-Time Water Quality

NRTWQ Home >> Maryland >> View Data >> 01649190

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

Model Form #1

log₁₀(TNR) = 0.1638 + 0.1758 log₁₀(TURBMA) + 0.0764 (log₁₀(TURBMA))²

where:

TNR is computed total nitrogen, in milligrams per liter as nitrogen
TURBMA is the mean-adjusted turbidity measurement calculated as the observed value minus the mean of logTurb for this station. The mean logTurb for this station is 1.5013, in formazin nephelometric units

Model Calibration

Basic Data

Number of measurements:	166
Mean squared error:	0.01666681
Multiple R²:	0.5632
Bias correction (smearing) factor:	1.04

Explanatory Variables

Variable	Value	Standard error
Intercept	0.1638	0.0147
log₁₀(TURBMA)	0.1758	0.0122
(log₁₀(TURBMA))²	0.0764	0.0106

Correlation Matrix

	Intercept	log₁₀(TURBMA)	(log₁₀(TURBMA))²
Intercept	1	-0.3378	-0.712
log₁₀(TURBMA)	-0.3378	1	-0.295
(log₁₀(TURBMA))²	-0.712	-0.295	1

Reference

Miller, C.V., Chanat, J.G., and Bell, J.M., 2013, Water quality in the Anacostia River, Maryland and Rock Creek, Washington, D.C.: Continuous and discrete monitoring with simulations to estimate concentrations and yields of nutrients, suspended sediment, and bacteria: U.S. Geological Survey Open-File Report 2013–1034, 37 p.