With all diligence, the harbor commission shall proceed with surveys of the harbor or harbors intended to be improved, developed, or protected, the preparation of plans therefor and estimates of cost thereof, and shall report to the board of supervisors thereon, with its recommendations concerning the necessity, advantage, and benefit to be derived by the improvement, development, or protection of such harbor or harbors; all as provided in Article 2 of this chapter, which provisions are incorporated herein to the extent that they are not inconsistent herewith.