R: Potomac River Peak Stream Flow Data.

Potomac {extRemes} | R Documentation

## Potomac River Peak Stream Flow Data.

### Description

Potomac River peak stream flow (cfs) data for water years (Oct-Sep) 1895 through 2000 at Point Rocks, Maryland.

### Usage

    data(Potomac)

### Format

A data frame with 106 observations on the following 2 variables.

Year

  a numeric vector giving the water year (Oct-Sep).

Flow

  a numeric vector the peak stream flow (cfs; 1 cfs = 0.028317 cubic meters per second).

### Details

Potomac River peak stream flow (cfs) data for water years (Oct-Sep) 1895 through 2000 at Point Rocks, Maryland.

These data (up to 1986) have been analyzed by Smith (1987) and this entire dataset by Katz et al. (2002) Sec. 2.3.2.

### Source

U.S. Geological Survey (http://water.usgs.gov/nwis/peak).

### References

Katz, R. W., Parlange, M. B. and Naveau, P. (2002) Statistics of extremes in hydrology. Advances in Water Resources, 25, 1287–1304.

Smith, J. A. (1987) Regional flood frequency analysis using extreme order statistics of the annual peak record. Water Resour Res, 23, 1657–1666.

### Examples

    data(Potomac)
    str(Potomac)
    # Fig. 3 of Katz et al. (2002) Sec. 2.3.2.
    plot(Potomac[,"Year"], Potomac[,"Flow"]/1000, yaxt="n", ylim=c(0,500), type="l", lwd=1.5,
        xlab="Water Year (Oct-Sept)", ylab="Annual peak flow (thousand cfs)")
    axis(2,at=seq(0,500,100),labels=as.character(seq(0,500,100)))

[Package extRemes version 2.0-8 Index]