The appraisers appointed to assess damages shall view the premises and determine and fix the amount of damages to which each claimant is entitled, and shall place a separate valuation upon the acreage of each owner taken for right-of-way for open ditches or for settling basins, as shown by plat of engineer, and shall, at least five days before the date fixed by the board to hear and determine the same, file with the county auditor reports in writing, showing the amount of damage sustained by each claimant. Should the report not be filed in time, or should any good cause for delay exist, the board may postpone the time of final action on the subject, and, if necessary, the auditor may appoint other appraisers.