Upon receipt of the petition required under section six of this article and, solely in the case of a flood relief project as defined in subparagraph (1) or (2), subsection (g), section two of this article, not earlier than the expiration of the election period required under section six of this article, the governing body, by ordinance or order, may create a community improvement assessment district and shall set forth in such ordinance or order, as the case may be, the boundaries of the assessment district and authorize the completion of the project therein in accordance with the study described in section four of this article.