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6U44 the hydraulic response of ground water aquifers to various inputs such as pumping, streamflows, precipitation and so forth. We have applied this model to part of the Arkansas Valley on the reach between La Junta and Las Animas and the results have been presented at the 3rd Conference of the American Water Resources Association. I That more or less summarizes some of the research we have done in the past. Presently we are engaged in research sponsored by the National Science Foundation, by the Office of Water Resources Research, by the Experiment Station and by the Colorado Ground Water Com- mission. Current research includes artificial recharge by flood waters into the ground water aquifers and we have the particular application of it in a recharge project. A report has been published on that particular project and another report will be forthcoming sometime in January. We are also concerned with the interaction of flows between bedrock and alluvial forma- tions. Dr. Waltz in the Department of Geology and myself have worked jointly on this problem. We have tackled the problem out in the Kiowa- Bijou area in which there are flows from the Fox Hills either going into the alluvium or from the alluvium going into the Fox Hills. We have one Master's thesis currently avail- able. This student completed his work on the quality of aspects of this particular problem and we hope to have in January a numerical solution to the problem which will be able to give exact numbers or at least estimates of the amount of water which is interchanged between these two aquifers. Another project currently under way is the prediction of the origin, movement and dis- tribution of contaminants in ground water- surface water basins. Numerical techniques are being developed for analysing water quality problems which may exist throughout an entire basin. Again, this project should be completed sometime in December. I