The provisions of this act, and of this act alone, shall apply to all drainage districts organized under its provisions, and nothing herein shall be construed to amend or repeal any law now in force and effect, except insofar as Kan. Stat. Ann. § 24-526 may modify the application of the laws under which said above smaller district may have been organized, with reference to the matters of drainage recited in Kan. Stat. Ann. § 24-501.