Act No. 316 of the Public Acts of 1923, as amended, being sections 261.1 to 278B.33, inclusive, of the Compiled Laws of 1948, Act No. 243 of the Public Acts of 1931, being sections 279.1 and 279.2 of the Compiled Laws of 1948, Act No. 38 of the Public Acts of the First Extra Session of 1932, being sections 279.11 to 279.17, inclusive, of the Compiled Laws of 1948, and Act No. 158 of the Public Acts of 1929, as amended, being sections 279.101 to 279.123, inclusive, of the Compiled Laws of 1948, are hereby repealed.

     In cases where the law shall have been amended during the progress of any drain proceedings, such proceedings shall not be invalidated by any such amendment, but may be continued to completion, and each step shall be governed by the law in force at the time such step was taken. Any drain proceedings pending when this act takes effect shall be completed in the manner prescribed in this act.

     This act shall not impair or affect any act done, offense committed or right accruing, accrued or acquired, or liability, penalty, forfeiture or punishment incurred prior to the time this act takes effect, but the same may be enjoyed, asserted, enforced, prosecuted or inflicted, as fully and to the same extent as if this act had not been passed.

     Actions heretofore taken by a drainage district or a public corporation and bonds heretofore issued under this act as originally adopted or subsequently amended are hereby validated. A district acting under this act as originally adopted or subsequently amended, or a public corporation shall not contest the validity of any bonds or any assessment which provides the security therefor or any action taken by the district or public corporation after the bonds are sold and delivered and consideration therefor is received.