ChoptankNH3: Stream Water Quality

Description Usage Format Source Examples

Description

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

Usage

1

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

1
2
3
4
5
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 May 9, 2019, 8:47 p.m.