waterData (version 1.0.8)

pH05082500: Hydrologic dataset with provisional and negative data.

Description

Daily median pH for the Red River of the North at Grand Forks, North Dakota, streamgage 05082500, from March 31, 2001, to December 31, 2011. At the time these data were downloaded, some of it was provisional data subject to revision.

Usage

pH05082500

Format

A dataframe containing 1,737 rows. There are four variables, staid, the USGS streamgage station number; val, the daily meadian pH value in standard unites; dates, the dates of the observations; and qualcode, the USGS data qualification code.

Name	Type	Description
staid	factor	USGS station identification number
val	numeric	Daily median pH
dates	Date	Date of daily value

Details

pH data for USGS streamgage 05082500, Red River of the North at Grand Forks, North Dakota, from March 31, 2001, to December 31, 2011. At the time these data were downloaded, some of the data were provisional and subject to revision, indicated by "P" in the qualcode column. Definitions of the daily data qualification codes can be found at http://help.waterdata.usgs.gov/codes-and-parameters/daily-value-qualification-code-dv_rmk_cd (U.S. Geological Survey, 2011).

References

U.S. Geological Survey, 2011, Daily value qualification code (dv_rmk_cd): National Water Information System: Help System, accessed September 7, 2012, at http://help.waterdata.usgs.gov/codes-and-parameters/daily-value-qualification-code-dv_rmk_cd. U.S. Geological Survey, 2012, National Water Information System (NWISWeb): U.S. Geological Survey database, accessed July 23, 2012, at http://waterservices.usgs.gov/.

Examples

data(exampleWaterData)
par(las=1, tck=0.02, mar=c(3,5,2,2), cex.axis=0.75)
plot(pH05082500$dates, pH05082500$val, type="l",  
     ylab="Daily median pH, water, \nunfiltered, field, standard units", 
     xlab="", yaxs='i', xaxs='i', ylim=c(7.4, 9), 
     xlim=c(as.Date("2007-01-01"), as.Date("2012-01-01")), col="red")
title("Red River of the North at Grand Forks, North Dakota",cex.main=0.95)
summary(pH05082500$val)