1600- 

 1440 

 1280 

 1120- 

 ^ 960- 

 6 800- 



2 640 



I- 



460 



320- 



ISO 







IJC Rtoomintndid Short Ttrm 0b|«etiv« (ISOOmg/L) 



N». j.>»o||l l l l ll|l l l l lll| I IUI II | l l l llll 

 1975 I 1976 I 1977 i 1978 I 1979 



nrm 



1980 



rrm 



/ 



V 



1981 



nrm 



1982 



4.0- 



3.6 



3.2 



2.8 



2.4 



2.0 



1.6 



1.2 



0.8 



0.4 



0.0 



Figure 3: Three-month short-term moving flow weighted concentrations 

 for boron and TDS in the East Poplar River near the Inter- 

 '' national Boundary, computed annually for the period of 



March to October, 1975 to 1982. Th& tviangles plotted in 

 2982 were derived from estimated daily concentrations 

 obtained by regressing with daily conductivities. For the 

 preceding years^ the plotted points were derived from the 

 results of the regular sampling program (see text for 

 further details). 



14. 



