Kan. Stat. § 12-623
Whenever the governing body of any such city shall determine to lay off and condemn a right-of-way from the corporate limits of such city to such point on such creek, ravine or river, and to construct sewers or drains, or to build or extend disposal works, as provided herein, the governing body may proceed to condemn the necessary lands or rights-of-way: Provided, Any person through whose lands such sewers or drains may be constructed, or upon whose lands such disposal works may be built, or who would be otherwise damaged, may give consent thereto in writing, and such writing, without formal acknowledgment, may be recorded in the office of the register of deeds of the proper county, and thenceforth the city shall have the same right to construct such sewers or drains and to build and operate such disposal works as though such lands had been formally condemned.
K.S.A. 12-623