; and (B) the Corps of Engineers immediately exercises its authority to perform such activity. (3) Additional guidelines The Administrator, in consultation with the Corps of Engineers, shall establish any additional guidelines for the use of funds awarded under this section. (g) Reimbursement of expenditures As a condition of a grant awarded to an eligible entity under subsection (b), the Administrator shall ensure that, following an expenditure of funds from the entity’s flood emergency fund, the entity will— (1) seek all available State and Federal disaster assistance reimbursements for such expenditures; and (2) deposit the reimbursements in the flood emergency fund. (h) Federal share The Federal share of the cost of a flood emergency activity carried out using grant funds made available under this section may not exceed 50 percent of the cost of such activity. (i) Definitions In this section: (1) Eligible entity The term eligible entity means a State local levee maintaining agency or unit of local government that— (A) is responsible for emergency flood response efforts; and (B) maintains and operates a flood emergency fund. (2) Flood emergency fund The term flood emergency fund means a fund established, maintained, and operated by a levee maintaining agency or a local designated coordinating agency, including the maintenance of the accounting of all Federal and non-Federal funds and derivation of such funds. (j) Authorization of appropriations There is authorized to be appropriated to carry out this section $50,000,000 to remain available until expended.