- 22 - 



u 



c 



3 60 



cr 



0) 



187-290 291-394 395-497 498-601 602-705 706-808 809-912 913-1015 1016-1119 1120-1223 



TDS (mg/L) 



Figure 13. — Distribution of TDS concentrations for East Poplar 

 River at International Boundary for period 1981-90. 



1500 

 1350 

 1200 

 1050 



\ 900 



en 



E^ 750 



^ 600 



450 



300 



150 







1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 



Year 



Figure 14. — Sen Slope estimate for TDS at East Poplar 

 River at International boundary. 



