Nev. Rev. Stat. § 539.327
When an irrigation district comprises lands which are or may be served by works constructed by the United States, and a contract is proposed to be entered into with the United States for the operation and maintenance by the district of the existing works, or for the construction of a drainage system or other extension or improvement of such works, and the lands in a division of the district may be regarded as clearly outside the scope of such contract, the election thereon and for the authorization of the program or undertaking contemplated thereby may be confined to the remaining portion of the district exclusive of such division, and the apportionment of the benefits may be made accordingly. Otherwise, the proceedings in connection with such contract and the program or undertaking contemplated thereby shall be as provided in this chapter.
NRS 539.327