When any improvement, development or protection of a bay, inlet, or other arm of the sea, commenced under this chapter is accomplished, and if the board continues the commission in existence, or if it thereafter creates another commission, the commission shall proceed to examine the harbor, bay, inlet or other arm of the sea in connection with the proposed further or additional improvement, development or protection and it shall provide detail plans and specifications therefor and report to the board the practicability and estimated cost.

The board shall then proceed as if the report was an original one.