The text and zoning maps of this chapter constitute the comprehensive zoning plan and regulations for the City and are adopted to protect and promote the public health, safety, morals, and welfare and to provide the economic and social advantages which result from an orderly, planned use of land resources. Such regulations are designed and intended to lessen congestion in the streets; to secure safety from fire, panic, and other dangers; to promote the health and general welfare; to provide adequate light and air; to prevent the overcrowding of land; to avoid undue concentration of population; to facilitate the adequate provision for transportation, water, sewerage, schools, parks, roads, and other public facilities and improvements, and to establish the most beneficial and convenient relationships among the residential, commercial, industrial, agricultural, recreational, and undeveloped areas, having regard to their suitability for the various uses appropriate to each of them and their potentiality for such uses, as indicated by existing conditions and trends in population, in the direction and manner of the uses of land, in building development, and in economic activity.
(§ 8111, T.O.O.C.)