(a) The director shall prepare under the direction of the board an annual budget for the district. To be effective, the budget must be approved by the board and then presented to and approved by the commissioners court of the county for which the district is established and the governing body of the principal municipality. A revision of the budget must be approved by the same entities in the same manner as the budget.
(b) As soon as practicable after the end of each district fiscal year, the director shall prepare and present to the board and to all participating public agencies in writing a sworn statement of all money received by the district and how the money was disbursed or otherwise disposed of during the preceding fiscal year. The report must show in detail the operations of the district for the period covered by the report.
(c) The board shall perform an independent financial audit of the district annually.