- 20 



1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 



Year 



Figure 10. — Mean daily discharge for water-quality sampling dates 

 for East Poplar River at International Boundary. 



O 



500 

 350 

 200 

 050 

 900 

 750 

 600 

 450 

 300 

 150 

 



JAN FEB MAR APR MAY JUN JJL AUG SEP OCT NOV DEC 



Month 



Figure 11. — Box plots of monthly TDS concentrations for East Poplar 

 River at International Boundary for period 1981-90. 



