Whenever the board of directors of any irrigation district, organized and existing under and pursuant to the laws of the state of Washington, shall by resolution declare that it deems it desirable that any contemplated or outstanding bonds of such district, including any of its bonds authorized but not sold, be certified under the provisions of this chapter, such board of directors shall thereupon file a certified copy of such resolution with the director of ecology. Such director on receipt of a certified copy of such resolution shall, without delay, make or cause to be made a full investigation of the affairs of the district.