Such election may be called by any board of directors and shall be called if a petition therefor, signed by thirty percent of the qualified electors in said district, as defined in section 37-43-108, is presented to any such board, which election shall be a special election and the question to be voted upon shall be submitted upon printed ballots on which the said question shall be set forth as follows:FOR an increase of the number of directors of the ......Irrigation District from three to five []AGAINST an increase in the number of directors of the ......Irrigation District from three to five []L. 45: p. 419, § 2. CSA: C. 90, § 487(2). CRS 53: § 149-3-5. C.R.S. 1963: § 150-3-5.