Abstract Ephemeral stream runoff and soil losses were estimated for small study basins in southwestern Wyoming using HYMO, a computer model that computes runoff and soil loss from precipitation and basin characteristics. Computed runoff was compared to measured runoff in one basin and a sensitivity analysis was made of the model. The comparison and analysis pointed out critical input variables requisite to reliable results. Runoff and soil loss graphs were prepared for the study basins as indicators of the effects of changes in range management practices.
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