This is the first report of the studies which have been projected to obtain the basic data on the runoff characteristics of the low land by the lake. The field measurements have been made in Hikawa district near Lake Shinji, Shimane Prefecture.
After some preliminary investigations, installations for collecting records of rainfall and runoff were established at several points in the area.
As the first step in the studies, a particular emphasis was given to the measurement of streamflow and the determination of the stage-discharge relations at a point upstream in Amba-gawa, one of the streams under investigation.
Some analyses, such as the estimation of roughness of the stream channel and the derivation of a unit hydrograph, were made by using the records obtained up to the present. These indicate some suggestions to the future studies, although they are not sufficient enough to draw a final conclusion.