All ordinances of a county drainage district shall be adopted by the board of directors of the district, and shall be certified to, recorded, and published in the same manner as ordinances of a county. The initiative and referendum powers are hereby granted to the electors of a county drainage district to be exercised in relation to the enactment or rejection of ordinances of a county drainage district in accordance with the procedure established by the laws of this state for the exercise of those powers in relation to counties.