The board of county commissioners shall at the date of the final hearing on the proposed improvement read the report of the county engineer, and it shall hear any testimony bearing upon the necessity of the improvement for the public convenience or welfare and offered either for or against proceeding with the improvement by any interested persons.
If the board finds such improvement will serve the public convenience and welfare, it shall by resolution enter such finding on its journal and determine to proceed with the improvement. If it finds such improvement will not serve the public convenience and welfare, it shall refuse to proceed with the improvement.