Based on the survey and evaluation results of torrential flood calamity in Chongqing from 2013 to 2017, the concept of micro-watershed in Chongqing and the calculation method of design flood for areas without hydrological data are proposed. By comprehensively overlaying each element layer, clustering the categories and integrating the fragments, six divisions of design flood for micro-watersheds in Chongqing are confirmed. A complete set of atlas and empirical formulas for the design flood calculation of the “six divisions and five frequencies of flood” covering the entire micro-watersheds of Chongqing is formed by carrying out the design flood calculation and correction and the flood survey data is used to verify the calculation results, which can be used in the ungauged micro-watersheds and completes and subdivides the results of the design flood in Chongqing areas.
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