Abstract
During the last full-glacial on the Southern High Plains of West Texas, the combined amount of precipitation and runoff into the small closed lake basins probably exceeded the present amount by at least 50%: minimum Pleistocene precipitation, based on the present local runoff of 3 inches, was approximately 29 inches; thus, West Texas was subjected to a pluvial climate in the classical sense during the last full-glacial. Pleistocene precipitation could have been less than the present rate and yet sustained the permanent Pleistocene pluvial lakes only if runoff averaged 35% of the precipitation rate. Such a high runoff-to-precipitation ratio occurs only with frequent intense storm activity.
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