The project on the Russian River for flood protection and water conservation in Sonoma and Mendocino Counties is adopted and authorized substantially in accordance with the recommendations of the Chief of Engineers in House Document No. 585, Eighty-first Congress, Second Session, as authorized by act of Congress approved May 17, 1950, Public Law 516, Eighty-first Congress, Second Session, at an estimated cost to the State of such sum as may be appropriated for state cooperation by the Legislature upon the recommendation and advice of the department, when funds for carrying out the project are appropriated by Congress.