The board, whenever the interest of the district shall require it, may cause a report to be made to the effect that the acquisition of certain property or works or the construction of such works is convenient or necessary to serve or fulfill the purposes of the district and that the cost thereof cannot be paid for out of the annual revenue of the district. The report shall be in such detail and shall be accompanied by such exhibits as will disclose the purpose sought to be accomplished and the means to be employed therefor. The report shall be printed in convenient form for distribution to the electors of the district.