Recent studies show that the views towards flood risk reduction have undergone a turn of approach. Indigenous knowledge Coastal villages (IKCV) have used several indigenous flood control and management knowledge systems to minimize the risk of flood disasters. Therefore, there is a growing demand to empirically identify the effectiveness of indigenous knowledge in flood risk reduction. As a result, this article has experimentally investigated the effectiveness of local knowledge of coastal villages in Chabahar County in reducing the risk of flood disasters. A mixed research methodology has been designed along with a (qualitative-to-quantitative conversion strategy. Qualitative data collection was realized through interviews with focus groups (FGDs), categories and categories were extracted through the thematic analysis method, and a questionnaire was used to collect quantitative research data. To measure the effectiveness, a confirmatory factor analysis method with SmartPLS 4 software was used. The samples were selected non-probably, including 32 people who were knowledgeable about the research subject. The thematic analysis of the interviews of the participants in the coastal villages of Chabahar indicates five categories of native knowledge of the coastal villages, which are mainly based on the experiential knowledge and local creativity of the natives. Therefore, the five main structures of indigenous knowledge of the coastal villages of the Chabahar region were confirmed. Respectively, Meteorological with a factor load of 0.851, Human with 0.626, Riverine with 0.477, Ecological with 0.468, and Celestial with 0.431 had the greatest role in reducing flood effects. This means that knowledge of local flood control and management in coastal villages of Chabahar effectively reduces flood risk. This study proposes a sustainable approach to flood disaster risk reduction based on the integration of indigenous knowledge systems and modern flood management strategies.