Colo. Rev. Stat. § 37-20-101
It is declared by the general assembly that the reclamation by drainage of lands not at present cultivatable or useful or fully so will be conducive to the public health, convenience, utility, or welfare. The owners of agricultural lands susceptible of drainage by the same general system of works may propose the organization of a drainage district by presenting to the board of county commissioners of the county where the larger portion of said lands lie a petition giving the name of the proposed district and praying that the board of county commissioners cause the question of the organization of said district to be submitted to a vote of the owners of the lands lying within the boundaries thereof or that a drainage system may be established without election, as provided in section 37-20-110.
C.R.S. § 37-20-101