Okla. Stat. tit. 82 § 615
In case any real property within or without any district is benefited which for any reason was not appraised in the original proceedings, or was not appraised to the extent of benefits received, or in case any individual, corporation, municipality, political subdivision or other district shall make use of or profit by the works of any district organized under the act to a degree not compensated for in the original appraisals or in case the directors of the district find it necessary, subsequent to the time when the first appraisals are made to take or damage any additional property within the district, the directors of said district, at any time such conditions become evident shall direct the board of appraisers to appraise the benefits or the enhanced benefits received by such property, including future benefits and future enhanced benefits thereto, or such damages or value of property taken, and the proceedings outlined in this act for appraising lands not at first included within the boundaries of the district, shall in all matters be conformed with, including notice to the party or parties, and as to lands or property without the district, the board of directors shall proceed under the condemnation laws of the State of Oklahoma, or the board may, at its discretion, make any suitable settlement with such individual, other district, corporation, county or municipality for such use, benefit, damage or property taken.
Okla. Stat. tit. 82, § 615