(1) This chapter shall be construed liberally and broadly to effectuate the policy and purposes herein set out.
(2) This chapter shall be deemed to be full and complete authority for the exercise of the powers herein granted, but this chapter shall not be deemed to repeal or to be in derogation of any existing law of this state.
(3) The provisions of this chapter shall not be construed to repeal, amend, limit, or restrict statutes heretofore or hereinafter enacted, providing for the establishment, support, financing, and maintenance of port commissions, authorities, or other local agencies having jurisdiction over harbors, ports, rivers, channels, and waterways, nor to be applicable to any bond issue, heretofore or hereafter issued for port or harbor purposes by any county or municipality in which said port is located and the provisions hereof shall be supplemental and cumulative and shall not repeal, limit or restrict the authority granted any public body or agency under any existing statute, except as herein otherwise expressly provided.