This study was conducted to prepare a flood susceptibility map in northwest of Hamadan Province, Iran. For this purpose, six criteria related to flood (i.e., distance to discharge channel, slope (%), elevation, soil texture and land use, topographic wet index, and check dams) were chosen. Then, based on the role of these criteria on degree of flood susceptibility, were weighted both in the context of inter-weighting (fuzzy logic) and outer-criteria (Interval Rough Analytic Hierarchy Process). Finally, by combining these primary weights by weight overlay method in GIS, the flood susceptibility mapping was prepared in the study area. The resulted map based on K-means clustering and Silhouette function was divided into 9 clusters, whereas the lower clusters show low susceptibility to flood and vice versa. To assess the accuracy of the produced map, 102 flood observation points were overlaid on the clustered flood susceptibility map. The results showed that among these 102 flood points, 66 points are located in the clusters 8 and 9 and 3 points are located on cluster 7. These values show that the produced flood susceptibility mapping has a high accuracy.
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