PURPOSE: A protection bank for inland waters of a harbor is provided to diminish the current of waves by guiding structurally and to secure the stable water quality by purifying the water quality of a harbor surrounded by a bank. CONSTITUTION: The protection bank for inland waters of a harbor comprises the steps of fixing a foundation(26) on the seabed to connect banks(11) mutually on the bank, forming a movable section(20) of a retreated groove on a wall of the bank(11), fixing an inclined isolation plate(13) having an inlet(19) and an outlet to a fixture of a wall(12), and fixing many inlet-outlet pipes(22) on the outlet to penetrate the other wall.
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