The report of the California Debris Commission transmitted to the Speaker of the House of Representatives of the United States by the Secretary of War on June 27, 1911, as modified by the report of the California Debris Commission, dated January 5, 1925, and as heretofore amended or modified by the board, is approved as a plan for controlling the flood water of the Sacramento and San Joaquin Rivers and their tributaries, for the improvement and preservation of navigation and the reclamation and protection of lands that are susceptible to overflow from the rivers and their tributaries.