3. THE PRESENT CONDITION OF RECLAMATION

3.1 Reclaimed Area in the Seto Inland Sea

　　The several districts around the Seto Inland Sea have been reclaimed. As shown in Table 3-1, the reclaimed area during 1898 ? 1924 was about 35 km2, and added about 66 km2 during 1925 ? 1949. Dramatically the area increased to be about 225 km2 from 1950 to 1973. The total reclaimed area from 1898 to 1997 has reached to about 432 km2. The trend of the reclaimed area in the Seto Inland Sea is shown in Figure 3-1.

Table 3-1 Reclaimed Area in the Seto Inland Sea

　

Accumulation
Term
Area
Years
Mean
1898-1997
432km2
99
1.3

Items
1998-1924
35　　
27
1.3
1924-1949
66　　
25
2.8
1950-1973
225　　
24
9.4
1974-1997
106　　
24
4.4
Total Area of the Seto Island Sea
23,203km2
Reclaimed Area/ Total Area
1.9%
Reclaimed Area/ Shallow Zone Area
20%
(Shallow Zone; less than 10 m in depth)

　

Note: after the data by Ministry of Construction and Environment Agency of Japan

Figure 3-1 Trend of Reclamation in the Seto Inland Sea

　

Note: 1) Permitted Reclamation from November 2 in 1973 to November 1 in 1997
　　　　2) Items in ( ) show permission year and area in order.
　　　　3) after the data by Environment Agency of Japan

Figure 3-2 Reclamation with Large Area (more than 50 ha) in the Seto Inland Sea

　

Note: after the data by Ministry of Transport (from period of Edo to 1979) and Environment Agency of Japan (after 1980)

Figure 3-3 State of Reclamation in Osaka Bay