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A method for assessing regional debris flow susceptibility at the watershedscale, based on an index composed of a morphometric indicator and a landcover indicator, is proposed and applied in 106 peri-urban mountainouswatersheds in Bogotá, Colombia. The indicator of debris flowsusceptibility is obtained from readily available information common to mostperi-urban mountainous areas and can be used to prioritise watersheds thatcan subsequently be subjected to detailed hazard analysis. Susceptibility isconsidered to increase with flashiness and the possibility of debris flowsoccurring. Morphological variables recognised in the literature to significantlyinfluence flashiness and occurrence of debris flows are used to construct themorphometric indicator by applying principal component analysis.Subsequently, this indicator is compared with the results of debris flowpropagation to assess its capacity in identifying the morphologicalconditions of a watershed that make it able to transport debris flows.Propagation of debris flows was carried out using the Modified Single FlowDirection algorithm, following identification of source areas by applyingthresholds identified in the slope–area curve of the watersheds. Results showthat the morphometric variables can be grouped into four indicators: size,shape, hypsometry and (potential) energy, with energy being the componentthat best explains the capability of a watershed to transport debris flows.However, the morphometric indicator was found to not sufficiently explain therecords of past floods in the study area. Combining the morphometricindicator with land cover indicators improved the agreement and provided amore reliable assessment of debris flow susceptibility in the study area. Theanalysis shows that, even if morphometric parameters identify a highdisposition to the occurrence of debris flow, improving land cover can reducethe susceptibility. However, if favourable morphometric conditionsare present but deterioration of the land cover in the watershed takes place,then the susceptibility to debris flow events increases. The indicator ofdebris flow susceptibility is useful in the identification of flood type,which is a crucial step in flood risk assessment especially in mountainousenvironments, and it can be used as input for prioritisation of flood riskmanagement strategies at regional level and for the prioritisation andidentification of detailed flood hazard analysis. The indicator is regionalin scope, and therefore it is not intended to constitute a detailed assessmentbut to highlight watersheds that could potentially be more susceptible todamaging floods than others in the same region

Regional debris flow susceptibility analysis in mountainous peri-urban areas through morphometric and land cover indicators