When and after a charter of incorporation shall have been granted to a drainage district as herein provided, all future duties, powers, rights, authority, limitations and restrictions of the powers of said drainage district shall be fixed and determined by the provisions of article 4, chapter 24 of the Kansas Statutes Annotated, and not under article 7, chapter 24 of the Kansas Statutes Annotated, except, however, as herein provided; but all proceedings had under said article 7, chapter 24 of the Kansas Statutes Annotated, shall be deemed regular and valid and sufficient to establish the necessity of the establishment of said drainage district and the boundaries thereof.
K.S.A. 24-485