Okla. Stat. tit. 82, § 82-571.1: Condemnation for easement purposes - Damages

When the board of directors of a conservancy district determines

that a lesser estate is needed for flood control purposes than fee

simple absolute, the board shall have the right to condemn for

easement purposes an easement as may be required.

In such cases, the measure of damages payable to a landowner

shall be the difference in the fair market value of the entire tract

with the easement and the fair market value of the entire tract

without the easement. Commissioners or jurors shall take into

consideration in assessing damages for permanent inundation or for

flowage easements for intermittent inundation of land, the estimated

or anticipated frequency of inundation, the value of the remnant of

the estate for landowner's agricultural or other economic use, and

such other relevant factors as may be ascertained or anticipated by

reasonable evaluation.