Agriculture and forestry development is a key subject for realzing the plan of settlement area in the Sanin district. This study aims to investigate the basic subjects relating to the river disaster and many problems involved in the flood control project or water utilization scheme at the area of agriculture and forestry development.
This report is described on the present condition of precipitation data and the results of investigation about the duration of river discharge in the Takatsu, Gono and Hii river basins which are three main drainages in Shimane Prefecture.
First, it is studied about the distribution characteristics of precipitation as the values of daily, monthly and annual average in Shimane Prefecture.
Second, it is made clear about the mean period of continuous precitation days and continuous non-precitation days.
Third, it is clarified about the annual characteristics of duration curve in river flow and mnimum, droughty, low, ordinary, high water and maximum discharge in the main river basins of Shimane Prefecture.
These results will be a great guide in attaching the hydrological problems of agriculture and forestry development in the Sanin district.