To create a new artificial shallow area in a hypoxic bay, we propose methods to determine the depth for the area and how to evaluate its effectiveness. The study was conducted in Mikawa Bay, Japan, which is a semi-enclosed sea and is regularly nutrient enriched. As a result, in summer, serious hypoxia is observed in the bottom layer, which becomes progressively lethal to the macrobenthos. Therefore the aim of developing a new shallow area should be to avoid hypoxia. The circumstances on which we developed the new method are described. Future technical subjects for the environmental restoration are also described.
