The total amount of the estimate shall be sufficient to raise the amount of money necessary during the ensuing year to pay the incidental expenses of the district, the costs of the work which the directors may deem advisable to be done during the ensuing year, the estimated costs of repairs to and maintenance of the property and works of the district, and the estimated expenses of any action or proceeding to which the district is or may be a party, including the cost of employing engineers and attorneys.