The department may expend any moneys available to it pursuant to paragraph (2) of subdivision (b) of Section 12300 or any moneys available from other sources of funding appropriated by the Legislature for the purposes of this part. In addition, the department shall seek a sharing of costs with the beneficiaries or owners or operators of the public facilities benefited by the flood protection projects. The department shall also seek cost sharing with, or financial assistance from, federal agencies which have programs applicable to, or which have an interest in, the flood protection projects.