A reapportionment shall be made in the following cases:

1. 1. By the commissioners appointed by the county court, where the original apportionment is reversed on the ground that it is erroneous, unequal or inequitable.
2. 2. By the board of sewer commissioners where the original apportionment is reversed upon any other ground. A reapportionment under this subdivision shall be made in like manner as the original.