The present invention relates to a system and a method for forecasting a disaster of a debris flow which forecast whether a disaster can occur due to a debris flow on a road adjacent to a slope of a mountain part or passing through the mountain part. Specifically, the present invention relates to a system and a method for forecasting a disaster of a debris flow which can effectively prevent a disaster due to a debris flow by generating an appropriate forecast in accordance with a risk of a disaster of a debris flow using a disaster risk determination information module including information classifying a risk by digitizing a debris flow disaster risk for a target basin through pre-inspection and using real-time rainfall measurement information for the target basin measured and provided in real time.
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