(1) This part and each section thereof shall be construed as granting additional power without limiting the power already existing in cities, towns, and counties.
(2) The provisions of this part and the methods of organization of water conservation and flood control projects are hereby declared to be an alternative method to any other method proposed by any law now in existence or hereafter enacted for the creation of such projects, and it is hereby declared that no provision hereof shall be amended or repealed by implication or otherwise as being in conflict with any existing law or future enactment unless specifically so declared by the legislature.