Lands lying within a drainage district or levee district organized under the laws of the state of Missouri where the lands embraced within such Missouri district are situated west of the present channel of the Missouri river and are ceded to the state of Kansas by the state of Missouri may be consolidated with an adjacent drainage district organized under the laws of Kansas: Provided, however, Such consolidation shall only be made if the territory sought to be annexed to the Kansas district lies adjacent to the Kansas district and the lands of both districts are served by common flood protection installations or common reclamation works.