Abstract
We report on the results of our survey on the pattern of land use change, distribution of areas inundated, and distribution of soils in N. part of Sapporo C., Hokkaido.
The pattern of land use change shows that the greater part of natural areas have changed to rural areas, afterward to residential areas. In 1954-1986, a great increase in population has made rural areas and natural areas to residential areas.
Compared with land use and soil map, the tendency of location for rural areas has related with the following three conditons ; distribution of soils, drainage condition and micro topography. Natural areas had the same tendency until residential areas sprawled. However, residential areas have a little relation with the above conditions.
It is interesting to note that recent residential areas located on soils with poor drainage have a high probability of being inundated. Therefore, the extent of soils with poor drainge indicates the possibility of areas inundated.
It is pointed out that the development of the draingae area, repair works of river and the ground subsidence caused by the development of the peaty land have changed flood hazard potential. Ignorance of natural condition has increased flood hazard potential. Attention to the natural conditions of drainge area is the desirable method of flood hazard management.
