was separate from domestic and commercial demand, but waste water was sent 

 through the same central processing unit. Water was supplied by a central supply 

 and processing unit obtained from ground, reservoir, or river sources. Alternative 

 waste-water-disposal activities included the conventional treatment processes of 

 (1) trickling filter and activated sludge, with the end product discharged directly 

 into the river, and (2) discharging unprocessed waste water into the river. 



The industrial sector included three industries found in the lower reaches of 

 the Ashuelot. These were a wool-processing firm, a tannery, and two paper 

 mills. Alternative water sources were permitted, each with numerous alternatives 

 of waste-water processing. Again, one alternative was disposal of waste directly 

 into the river, without being processed. 



The overall constraints for all sectors were quality limits imposed on the 

 Ashuelot River itself. Coliform bacteria and biochemical oxygen demand con- 

 straints were based upon analysis of the river performed in the summer of 1967 

 for one set of constraints and for a second set of quality constraints the water- 

 classification level of B-class quahty for the entire river. 



The objective functions are listed and defined in Appendix B, Table 1. The 

 annual portion of the model is listed and defined in Appendix B, Table 2. The 

 model is quite extensive and in many ways quite complicated. The specific 

 choice of column and row units was dictated by modeling convenience and the 

 terms in which data were available. Also, adjustments in units were made to 

 accommodate the assumptions of linear programming. 



The actual model coefficients and control programs are not presented in this 

 report but are available at the cost of computer compilation and duplication. 



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