For the purposes of this Act:
(1)
Affected area— The term affected area means lands along the approximately 116-mile stretch of the Red River from its confluence with the North Fork of the Red River on the west to the 98th meridian on the east between the States of Texas and Oklahoma.
(2)
Secretary— The term Secretary means the Secretary of the Interior, acting through the Director of Bureau of Land Management.
(3)
South Bank— The term South Bank means the water-washed and relatively permanent elevation or acclivity, commonly called a cut bank, along the southerly or right side of the Red River which separates its bed from the adjacent upland, whether valley or hill, and usually serves to confine the waters within the bed and to preserve the course of the river; as specified in the fifth paragraph of the decree rendered March 12, 1923, in Oklahoma v. Texas, 261 U.S. 340, 43 S. Ct. 376, 67 L. Ed. 687.
(4)
South Bank boundary line— The term South Bank boundary line means the boundary between Texas and Oklahoma identified through the gradient boundary survey method; as specified in the sixth and seventh paragraphs of the decree rendered March 12, 1923, in Oklahoma v. Texas, 261 U.S. 340, 43 S. Ct. 376, 67 L. Ed. 687.
(5)
Gradient boundary survey method— The term gradient boundary survey method means the measurement technique used to locate the South Bank boundary line under the methodology established by the United States Supreme Court which recognizes that the boundary line between the States of Texas and Oklahoma along the Red River is subject to such changes as have been or may be wrought by the natural and gradual processes known as erosion and accretion as specified in the second, third, and fourth paragraphs of the decree rendered March 12, 1923, in Oklahoma v. Texas, 261 U.S. 340, 43 S. Ct. 376, 67 L. Ed. 687.