Pursuant to applicable provisions of §§ 15.1-491.1 through 15.1-491.6, Code of Virginia 1950, as amended, the purpose of conditional zoning is to recognize that frequently, where competing and incompatible uses conflict, traditional zoning methods and procedures are inadequate, and that in such cases more flexible and adaptable zoning methods are needed to permit differing land uses and at the same time to recognize the effects of change.