Notwithstanding any other provisions of Chapter 2 (commencing with Section 12639) and Chapter 3 (commencing with Section 12800) of this part, and this chapter, the following policy shall apply to projects authorized by the Legislature after November 10, 1969, and to small flood control projects authorized by Section 12750 for which the department made the findings required by Section 12750.1 after November 10, 1969.

(a) The state shall pay 75 percent of the costs of lands and rights or interest in lands whereon channel improvements and channel rectifications 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, 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 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, 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 or, in the case of a small project authorized by Section 12750, at the time the report recommending federal authorization is submitted to the United States Army Chief of Engineers, except in the case of emergency flood control construction when congressional authorization and appropriation are concurrent and the normal planning procedures are not followed.

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 determination as it deems justified by the project changes.

(f) When a project authorized prior to November 10, 1969, is so modified that it becomes subject to the provisions of Section 12639, 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.

(Added by Stats. 1973, Ch. 893.)