Joint district sewers may be constructed by the city whenever the city may deem it necessary that a sewer should be constructed uniting one or more districts and unorganized territory, or uniting districts or unorganized territory. In such case it may, by ordinance, unite such districts as aforesaid into a joint sewer district and cause a sewer to be constructed therein in like manner and in all respects as is provided in the case of district sewers; except in cases of joint district sewers, the city may, if deemed proper, provide in the ordinance creating such joint district sewer that the city shall pay a certain sum, to be specified in such ordinance, toward the payment of such joint district sewer.

(Code 1964, § 14.700)