Potomac               package:extRemes               R Documentation

_P_o_t_o_m_a_c _R_i_v_e_r _p_e_a_k _s_t_r_e_a_m _f_l_o_w _d_a_t_a.

_D_e_s_c_r_i_p_t_i_o_n:

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

_U_s_a_g_e:

     data(Potomac)

_F_o_r_m_a_t:

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

     _Y_e_a_r a numeric vector giving the water year (Oct-Sep).

     _F_l_o_w a numeric vector the peak stream flow (cfs; 1 cfs = 0.028317
          cubic meters per second).

_D_e_t_a_i_l_s:

     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.

_S_o_u_r_c_e:

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

_R_e_f_e_r_e_n_c_e_s:

     Katz, Richard W., Parlange, Marc B. and Naveau, Philippe.
     Statistics of extremes in hydrology. Advances in Water Resources,
     (25):1287-1304, 2002. 

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

_E_x_a_m_p_l_e_s:

     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)))

