; and (B) the cost allocation of reimbursable costs to each project beneficiary reflects any changes in the benefits that the modified project is providing to the project beneficiary. (4) Incentive for benefitting entities to participate in projects with increased public benefits (A) In general The total amount of reimbursable capital costs, as determined under paragraph (3), for extraordinary operation and maintenance work described in subparagraph (B) shall be reduced by 15 percent, with each project beneficiary to be responsible for 85 percent of the reimbursable costs that would otherwise be allocated to the project beneficiary. (B) Description of extraordinary operation and maintenance work The extraordinary operation and maintenance work referred to in subparagraph (A) is extraordinary operation and maintenance work involving a project modification that would increase nonreimbursable public benefits without increasing reimbursable municipal, industrial, or irrigation benefits from the original design of the planned extraordinary operation and maintenance work. (5) Reimbursable funds All reimbursable costs under this subsection shall be repaid in accordance with subsection (b). .