The project for flood control runoff retardation and soil erosion prevention in the watershed of the Hagador-Tin Mine-Kroonen Oak Street Channel, as authorized by Section 216 of the Flood Control Act of 1950, Public Law 81-516, 81st Congress, 2nd Session (64 Stat. 163), is adopted and authorized at such cost to the state as may be appropriated for state cooperation by the Legislature upon the recommendation and advice of the department.