The Zoning Ordinance is hereby adopted in accordance with a Comprehensive Plan which is designed to promote public health, safety, morality and the general welfare; encourage the most appropriate use of land; conserve and stabilize the value of property; provide adequate open spaces for light and air; prevent the incidence and spread of fire; prevent undue concentrations of population; lessen congestion on streets and highways; secure the City from flood and other dangers, and assure adequate provision for transportation, utilities, schools, parks and other public necessities. (12-17-79.)