STUDY NUMBER ; 10.1 



ORGANIZATION ; University of Montana (UM) 



TITLE OF STUDY ; Development and Application of Synthetic/Pre- 

 dictive Water Quality Modeling for the Clark Fork River System 



CONTACT ( S ) ; Vicki Watson - University of Montana, Botany/EVST 



Department, Missoula - 243-5153 



OBJECTIVE ; Utilize a suite of models to evaluate the impacts 

 of organic loading, nutrients and heavy metals upon the water 

 quality and the biological organisms of the Clark Fork River. 



DURATION; 1985 - 1987 



CURRENT STATUS ; Most of the water quality information to be 

 used in these modeling efforts has already been collected or 

 is presently being collected by the Montana Water Quality Bureau 

 or the U.S. Geological Survey. However, a survey of river mor- 

 phometry and turbulence will be conducted during low flow and 

 during the falling hydrograph (following high flow) to provide 

 a better estimate of the physical reaeration potential of the 

 river and to help select the range of models to be used. 



A variation of the QUAL II model will be used to assess 

 the impacts of organic loading upon the river ' s dissolved oxygen 

 levels. Potential impacts of changing nutrient loads upon the 

 trophic status of the lower river reservoirs and Lake Pend Oreille 

 will be estimated using modifications of the Vollenweider in- 

 put-output model. Metal species equilibria will be assessed 

 using the MINEQL model developed, in part, by the Battelle Pa- 

 cific Northwest Laboratory. 



FUTURE ACTIVITIES ; Water quality data for use in the various 

 models will be compiled. Stream morphology measurements will 

 continue. Actual modeling will be performed on the University 

 of Montana's DEC 20 computer system. 



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