When the day set for hearing has arrived, and the hearing is not continued by the court for good reason, as it may be, the county court shall proceed to hear and determine all objections made and filed to the report, and may increase, diminish, annul, or affirm the apportionment and assessments made in such report, or any parts of the report, as may appear to the court to be just and equitable; but in no case shall it be competent to show that the lands assessed would not be benefited by the improvement. The county court shall assess such apportionment so fixed by it upon the lands within such levee or drainage district.