Abstract
A method of predicting, in an indirect manner, a big likelihood of landslide resulting from a prolonged rainfall or a cloudburst, on the basis of analysis of the information on the rainfall of present and during a plurality of past days for declaring timely warning for safety-evacuation of the local inhabitants is indicated, together with the conception and description of setup of unique Effective Rain Gauge ingeniously worked out by the author, with a special concern given to the facilitation of the declaration of warning.