Colo. Rev. Stat. § 37-42-136
The board of directors of any irrigation district may cause surveys, maps, estimates of cost, and a report of feasibility to be made looking to the drainage of the whole or any part of an irrigation district which may have become, or threatens to become, seeped or too wet or which requires drainage for profitable cultivation. Such surveys, maps, estimates, and report shall be filed in the office of the district, and such matters shall be submitted to the landowners at a general or special election held not less than sixty days from the date of the filing of such documents. If the landowners express their approval of such drainage undertaking by affirmative vote of a majority of the votes cast at such election, the district may proceed to do such drainage work and shall have like powers with reference thereto, including the levying of an assessment or the issuing of bonds, to defray the expense thereof.
C.R.S. § 37-42-136