In this paper a linear programming technique is used as an aid in selecting storage reservoirs for a hydroelectric power development system at the feasibility stage of investigation, and for maximizing system guaranteed hydroelectric power by optimum regulation of discharge through power plants and from diversions for a selected time period. The linear programming technique is used as an allocation or screening model that provides information on system operation and response which would be useful in the preliminary design of hydroelectric power producing facilities and from which basic data and guidelines could be extracted for extending the investigation to the study of long-term system response by use of simulation models.