Colo. Rev. Stat. § 37-31-101
It is declared that the seepage conditions existing in the territory described in section 37-31-102 are peculiar to that particular territory and affect in a peculiar manner the people residing and owning property within said district. It is further declared that torrential storms affect the territory in said district in an adverse manner. It is further declared that the construction of a suitable drainage works for the protection of urban and rural property within said district will promote the health, comfort, safety, convenience, and welfare of all the people residing or owning property within said district and that the construction of said drainage works is therefore a governmental function conferring a general benefit upon all of the people residing or owning property within said district.
C.R.S. § 37-31-101