Land use management measures used include both preventive and corrective techniques. Preventive land use management techniques seek to prevent the introduction of additional noise sensitive land uses within existing and future airport noise contours. Corrective land use management techniques seek to remedy existing and projected future unavoidable noise impacts in existing areas of incompatible land use. The responsibility for determining the acceptable and permissible land uses and the relationship between specific properties and specific noise contours rests with the local authorities.