Whenever state grants under this chapter are used in a flood control maintenance project, the engineer of the county within which the project is located shall approve all plans for the specific project and shall supervise the work. The approval of such plans, construction and expenditures by the department of ecology, in consultation with the department of fish and wildlife, shall be a condition precedent to state participation in the cost of any project beyond planning and designing the specific project.

Additionally, state grants may be made to counties for preparation of a comprehensive flood control management plan required to be prepared under RCW 86.26.050.