The RIVER BASIN MODEL is a man-machine simulation model used to delineate the interactions taking place, within a real or hypothetical area, between the local water system and the economic, social and governmental activities of that area; it is a model of an entire regional system, with water a subsystem realistically interacting with all the other major subsystems, such as housing and transportation. A gaming format is employed. The Governmental (provides public services) Sector and the model required by its Chairman team, and the computer printed output are described. Each political jurisdiction has a chief executive called the Chairman. The report describes the functions of the Chairman in this simulation. The Chairman makes departmental appointments to the local government departments, and he sets budget policy decisions. His office is an elected one, and periodic elections are held in which the members of the Social Sector vote for nominated candidates.