Notwithstanding any other provisions of this chapter, the following policy shall apply to projects approved by the appropriate committees of the Congress and by the Department of Agriculture after November 10, 1969:

(a) The state shall pay 75 percent of the costs of lands and rights or interests in lands whereon channel improvements and channel rectifications, debris dams and water-retarding structures are located and of lands, rights, or interests in lands necessary in connection with the construction, operation, or maintenance of such channel improvements and rectifications, debris dams and water-retarding structures, including those necessary for flowage purposes, spoil areas, borrow pits, or for access roads, apportioned to the benefits resulting from the reduction of flood damage.

(b) The local agency shall pay 25 percent of the costs of lands and rights or interests in lands whereon channel improvements and channel rectifications, debris dams and water-retarding structures are located and of lands, rights, or interests in lands necessary in connection with the construction, operation, or maintenance of such channel improvements or rectifications, debris dams and water-retarding structures, including those necessary for flowage purposes, spoil areas, borrow pits, or for access roads, apportioned to the benefits resulting from the reduction of flood damage and all of such costs apportioned to the benefits resulting from increased or higher utilization of land.

(c) The state shall pay 90 percent of the costs of the relocation, reconstruction, or replacement of existing improvements, structures, or utilities rendered necessary by the project, apportioned to the benefits resulting from the reduction of flood damage.

(d) The local agency shall pay 10 percent of the costs of the relocation, reconstruction, or replacement of existing improvements, structures, or utilities rendered necessary by the project, apportioned to the benefits resulting from the reduction of flood damage and all of such costs apportioned to the benefits resulting from increased or higher utilization of land.

(e) The state’s portion of the costs under subdivisions (a) and (c) shall be determined by the department at or prior to the time the report recommending federal authorization is submitted to the Congress. In the case of projects already having federal authorization, the state’s portion of such costs shall be determined by the department at the time state authorization is sought by the local agency. The state’s portion shall not be changed unless there are major project changes made in the plan of improvement, in which case the department, prior to the next appropriation of state funds for the project, shall review the project and make such new determinations as it deems justified by the project changes.

(f) When a project approved prior to November 10, 1969, is so modified that it becomes subject to the provisions of Section 12873, the policy described in this section shall be applied to any portion of the modified project which the department determines to be beyond the scope of the originally authorized project.

(Amended by Stats. 1974, Ch. 1054.)