ChoptankNH3: Stream Water Quality

In USGS-R/smwrData: Example hydrologic data to support statistical methods in water resources

Stream Water Quality

Description

Selected ammonia concentration data for Choptank River near Greensboro, Maryland, USGS station number 01491000.

Usage

ChoptankNH3

Format

Data frame with 182 rows and 13 columns

Name	Type	Description
agency_cd	character	Agency code
site_no	character	USGS station number
sample_dt	Date	Sample date
sample_tm	character	Sample time
time_datum_cd	character	Time zone datum
parm_cd	character	Parameter code
remark_cd	character	Remark code for the value
result_va	character	Numeric value of the result
val_qual_tx	character	Result value qualifier code
meth_cd	character	Lab method code
dqi_cd	character	Data-quality indicator code
rpt_lev_va	character	Reporting level
rpt_lev_cd	character	Reporting level type

Note: all concentrations in the column result_va are in milligrams per liter as nitrogen.

Source

Data retrieved from NWISWeb (http://nwis.waterdata.usgs.gov/md/nwis/qwdata) on 2012-06-18. Column names are preserved as retrieved, but unnecessary columns were deleted.

Examples

data(ChoptankNH3)
# Concentration values plotted over time--black is uncensored, red represents
# a less-than value and green are E-coded (less than the reporting level, but
# greater than the detection limit).
with(ChoptankNH3, plot(sample_dt, result_va, col=as.factor(remark_cd)))

USGS-R/smwrData documentation built on Oct. 18, 2022, 9:56 a.m.