Abstract
The South Platte river system is typical of many stream systems in the arid west. A computer simulation model was used to project the water quality improvements resulting from implementation of 1977, 1983, and 1985 effluent quality limitation requirements of PL 92-500 for all waste discharges in the basin. Implementation of PL 92-500 will result in continued good quality of waters in the mountains zone. The results of the simulation showed that sufficient improvements of water quality in the plains zone will be achieved by 1983 to permit fish propagation and recreation. However, improvement in water quality alone in the plains zone will result in few benefits at very high cost. Their achievement is essentially precluded by the modifications brought about by intense human uses of the stream and associated lands and by the limiting natural characteristics of the plains system.
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