The ordinance ordering the work to be done and approving the assessment district shall contain a description of the assessment district similar to that contained in said order of said Director declaring his intention. In all other ordinances, resolutions, notices, orders and determinations, subsequent to said order of said Director declaring his intention and subsequent to the notices of hearing thereon, except the notices of recordation in the Department of Public Works of the assessment hereinafter provided for, it shall not be necessary to describe the assessment district, but it shall be sufficient to refer to said order of said Director declaring his intention for a description of the work and a description of the assessment district.