Kan. Stat. § 13-1018h
The governing body of any such city shall have the power to condemn or acquire by purchase lands for the construction of sewage-disposal plants and lands or any easements therein or rights-of-way necessary for the construction and maintenance of sewers, drains, pumps and other appurtenances provided herein: 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 otherwise be 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 works as though such lands had been formally condemned.
K.S.A. 13-1018h