Funds borrowed from the revolving development fund, together with interest due thereon, shall be repaid to the board and placed in the revolving fund together with receipts and revenues of any type and nature derived from any project constructed, operated, or maintained, in whole or in part, with moneys from the revolving fund, revenues received over and above the cost of projects financed by revenue bonds, revenues collected by or on behalf of water user entities for the purpose of repaying indebtedness under applicable statutory authority, revenues received from the sale of state land acquired by the board for water projects, surplus revenues from the sale of Carey Act (Title 43 USCA s. 641) lands, revenues received from the lease of water rights, fees received from water deliveries which are in excess of costs on projects sponsored by the board, gifts or grants from any source when the same are made for purposes consistent with those for which the revolving fund is established, and moneys from any other appropriate source.