PART III. CONSTRUCTION.
The provisions of this article are in addition to and not in
derogation of any power and authority vested in any public agency
under any constitutional, statutory or charter provisions which may
now or hereafter be in effect, and under no circumstances whatever
shall the provisions of this article be construed as in any way
limiting the power and authority to take joint or cooperative
action or enter into agreements or contracts granted in other
articles of this chapter.