No contract, however, requiring the levy of assessments for more than one year shall be entered into by the district as above provided unless a proposition of entering into such a contract shall have first been submitted to the electors of the district as herein provided for the calling, noticing, conducting and canvassing of special district elections, and by said electors approved.
[ 1937 c 72 § 58; RRS § 9663E-58. Formerly RCW 86.08.270, part.]