An interesting contemporary study of the processeswhereby scientists, policy makers and vulnerable people constructdiscourses of urban risk and floods. This study developed a socialconstructionist analysis of ́natural ́ disaster at the policy level for Mexico byfocusing on arguments, discourses and rhetorical elements. Theinterpretivist analysis of disaster policies carried out in thisresearch highlighted the importance of taking into consideration the existenceof different, and often contested, policy values which underpindifferent policy responses. It explained the rhetorical and discursivepower of ́disaster causal ́ stories in constructing reality of ChalcoValley's floods, peri- urban interface of Mexico City, and provided a methodto examine the inundations causality as a policy problem.