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Western states of the United Stares, facing steadily increasing demands for limited water resources in an arid region, have developed administrative regimes for regulating water use based on the judicially developed private property concepts derived from the customary appropriative rights dominant in the western states. Eastern states of the United States have declined to adopt appropriative rights but have instead developed a markedly different model of administrative rights based upon riparian principles. This new model of water law is best described as a "regulated riparian" system. Under regulated riparianism, water is treated as a form of public property rather than as a form of common property (as under riparian rights) or as a form of private property (as under appropriative rights). Water use depends upon the grant of a permit by the state and is not limited to riparian lands, but the allocation is made according to administrative determinations of the "reasonableness" of competing uses rather than upon temporal priority.