The results of this study suggest that a, digital model based on a random walk may be used to simulate alluvial fan deposition. The model is in three dimensions, is dynamic in time and space, and employs two independent stochastic events: an uplift of the mountain basin contributing sediments and a storm large enough to result in fan deposition. A random walk, each step governed by the gradient and momentum of flow, determines the pattern of deposition. Results of the simulation are printed as geologic maps and sections. The general form of the simulated deposits is that of an alluvial fan, the pattern of simulated flows resembles that of real flows, and fan facies show a concentration of debris flows near the apex and a particle size decrease in water flow deposits downfan. The model could aid in the development of data collection systems, the estimation of aquifer parameters in undeveloped areas, better interpretation of aquifer tests, and improvement in the accuracy of test‐hole correlations.

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Changes in chemistry, temperature, and radioactivity of C *iio River water ______________________________________________________ Drainage problems associated with increased urbanization._________ Higher dams and resulting changes in pool stage_________________ 69 Changes in amount or character of river-bottom sediment._________ Conclusions.

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Occurrence of ground water_________________________________________ General groundwater conditiOns m the Western Coal Field regiOn__ FluctuatiOn of water levels______________________________________ Water m the alluviUm__________________________________________ 18 Water m the bedrock__________________________________________ 21 Deterrnmmg the availability of ground water at a gtven site________ 23 SuggestiOns for further studies__________________________________ 25 Methods of obtammg ground water__________________________________