This report was prepared in accord with the following specific set of objectives: To make a general appraisal, using currently available information, of the ground-water resources of the Ohio River basin; to present the information in such a manner as to be readily usable as a general basis for long-range planning and as a guide for management and development decisions by public water-action agencies, and to point out hydrologic factors that should be taken into consideration by the action agencies in formulating and implementing water-resource development plans.