We investigated the water area reclamation projects, in particular the changes of these projects in Japan after the World War II.
Firstly, we explained the institution of water area reclamation projects.
Secondly, we classified these projects and made the distribution maps of the projects.
From these results, the following was found worthy of being reported:
1) Sea coast reclamation projects are concentrated around Ariake Sea, Yatsushiro Sea, Seto Inland Sea, Ise Bay, Mikawa Bay and Kagoshima Bay where tidal range is remarkable.
2) All projects above mentioned except Kagoshima bay belong to alluvial plains
3) Water area reclamation projects at lakes are almost all distributed around large lakes or brackish water lakes, i. e. Lake Shinji, Nakaumi, Lake Biwa, Lake Hamana, Kasumigaura, Imbanuma, Teganuma, Izunuma, Hachirogata, Lake Jusan.
4) The total number of the sea coast reclamation projects is more than that of the water area reclamation projects. But the total project area and the total reclamation area of the latter are larger than those of the former.
Then, from the view of social conditions, international situations and agricultural administrations, we discussed the historical transition of the projects in detail, and explained the change and decay of the projects.
Lastly, we presented some tables of the project area and the reclamation area produced by each projects and these diverted area.
