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phase was then to determine the effects on streamflow caused by recharge and pumping. So first we are determining what happens to storage, second we are determining what happens to the stream due to pumping and the applications of irrigation water. The third phase is to determine what the overall avail- ability of water in the combined ground water- surface water system is. We have made signi- ficant progress in this particular direction by mating the analog model with the digital computer system and by using the digital computer system then, we are able to deter- mine what the return flow would be under any particular set of circumstances and conse- quently for any change in water management plan that was contemplated we could test this on the model and be able to predict whether or not this would be a substantial improvement over past water management prac- tices. The fourth part of our study, the effects on water quality from changes in water-management practices, is in its infancy stage. What we are trying to do here is to develop meaningful relations between water quality and its movement to the ground water system and into the stream and as it follows the course downstream. We have found some shortcuts and we are very hopeful that after development of this step three we will be able to proceed on to step four. We were extremely fortunate in getting to step three to acquire the services of our Washington office scientific staff. They most recently - within the last year - formed a group back there of selected scientists who are particularly competent in the field of systems analysis and in operations re- search. When we posed the problem to them that the State of Colorado was particularly concerned in proving the management of their water supply, we posed to them the problem of how could we test on our models a program that would give us optimum benefits of water. To do this we gave them the following criteria: I I