When said board of supervisors, by order entered of record, has agreed upon a location or route for said ditch or ditches, and formulated a plan for the other improvements contemplated, then, they, in behalf of said district, shall have the right to acquire and if need be condemn any real estate, easement, or franchise, whether the same be within the limits of such district or outside its boundaries that may be necessary for a right of way over or upon which to construct and maintain the ditches, dikes, drains and other works contemplated by any of the provisions of this act, and when the board of supervisors is unable to agree with the owners of any such property as to the acquisition of such right of way, or if the owners are not residents of the county, or cannot be found, or are minors or persons of unsound mind, or incapable of making a legal contract, the board of supervisors, when other means are not specifically provided, may proceed to acquire such right of way under the power of eminent domain in accordance with Kan. Stat. Ann. §§ 26-501 to 26-516, inclusive. Said board of supervisors, in behalf of such district, shall have the right to acquire, and if need be, condemn in the same manner as hereinbefore provided for the acquirement and condemnation of rights of way, any natural or artificial obstruction in any existing watercourse and remove the same therefrom for the benefit of said district.