The term “drainage district”, as used in this article, shall comprehend and mean the building of storm sewers as provided in this article, or the reclamation of lands, as provided in this article, and in general shall comprehend the doing of any necessary improvement to effectuate such purposes and the assessment of the cost thereof, according to a just, fair and equitable apportionment, against the property specially benefited and enhanced in value by the making of such improvements. (Code 1941, Art. 128-3)