For the purpose of carrying out and effecting the objects of this section the Secretary of the Interior is authorized to enter into a contract with the organization formed by the owners of the lands irrigated within said project or project unit pursuant to section
498 of this title, stipulating and providing that the organization will maintain and use such of the lands so reserved for the purposes prescribed in this section as such organization may desire, and that upon failure to so maintain and use such lands, or in the event that same shall be permitted to be used or occupied for other purposes than those stipulated in this section, the control of the lands shall revert to the United States.