Public Facilities Districts and regulations are established in order to achieve, among others, the following purposes:
(a) To provide governmental, civic, educational, religious, welfare, recreational, and transportation facilities in locations for the general safety, convenience, comfort, and welfare, and
(b) To protect these public and semipublic facilities and institutions from the encroachment of other uses and to protect adjoining residential uses from injurious effects, and
(c) To provide an environment for the proper functioning of public facilities in relation to a well-considered community plan. (1980 Code 151.01)