C.R.S. § 37-25-101

For the purpose of constructing a drainage system and necessary works for any drainage district and acquiring the necessary property and rights therefor, of paying the first year’s interest upon the bonds authorized in this article, and of otherwise carrying out the provisions of articles 20 to 30 of this title, the board of directors of any drainage district may estimate and determine the amount of money necessary to be raised for such purposes and is empowered to call a special election to determine whether or not bonds of said district shall be issued in the amount so determined.