The owners of land that requires combined drainage may provide for the establishment of a drainage district, or location and construction of drains, ditches, and watercourses upon their own lands by mutual agreement in writing duly signed, acknowledged, and filed with the county clerk.
Mutual agreements authorized
Tenn. Code Ann. § 69-5-1301, under Districts by Mutual Consent.
Tenn. Code Ann. § 69-5-1301