Colo. Rev. Stat. § 37-42-101
Whenever the landowners of any prescribed area within the state of Colorado desire to organize an irrigation district for the purposes named in this article, they may propose such organization by presenting to the board of county commissioners of the county within which said area, or the greater part thereof, lies a petition praying such organization, signed by a majority of such landowners, whether resident or not, owning in the aggregate a majority of the acreage of such area so proposed to be organized. Such petition shall contain a definite description by metes and bounds of the area included within the exterior boundaries of said proposed district and a description by legal subdivisions of the area proposed to be organized, together with a statement of the purposes of organization and the property and rights proposed to be acquired or constructed, and shall name a resident of the county of proposed organization as agent for the proposers of organization, who shall act as their representative until such time as organization has been completed. Accompanying this petition, a schedule shall be filed showing by legal subdivisions, with acreage, the land owned by each signer and the total acreage of the proposed district, together with a map of the proposed district and the proposed system for its irrigation or reclamation, drawn to such scale and in the manner required by such rules as are promulgated by the state engineer for such purpose. These instruments shall be accompanied by a bond approved by the board of county commissioners in such amount as it shall fix, conditioned that all costs of inspection and organization shall be paid by the bondsmen in case organization is not effected. Copies of all instruments and maps filed with the board of county commissioners under this article shall also be filed with the state engineer.
C.R.S. § 37-42-101