The board, in a resolution authorizing the issuance of revenue warrants, may provide for special funds for the deposit and application of the proceeds of the warrants and for the deposit and application of revenues pledged to secure their payment. The board may provide for the establishment of a reserve fund from the proceeds of the revenue warrants or from revenues pledged to their payment. The board may appoint a fiscal agent to hold any or all such funds in trust for the holders of revenue warrants and for the district.