Iowa Code § 468.62
If, after the improvement has been finally located and before construction thereof has been completed, there has been a change of conditions of such nature that the plan of improvement as adopted should be modified or amended, the board may direct the engineer appointed under section 468.30 or another engineer, to make a report showing such changes or modifications of the plan of improvement as may be necessary to meet the change of conditions. Upon the filing of such report, the board shall have jurisdiction to adopt said modified or amended plan of improvement or may further modify or amend and adopt the same by following the procedure provided in sections 468.201 and 468.205 through 468.209 so far as same are applicable, except that awards for damages shall not be canceled where there has been no change made in the improvement which would increase or decrease the damages awarded. However, modifications and changes may be made in the plan on which hearing was held without further notice or hearing, provided the same do not increase or decrease the estimated cost to the district by more than twenty-five percent.
Iowa Code § 468.62
89 Acts, ch 126, §2
Referred to in §468.66