Influence and interactions of input factors in urban flood inundation modeling: An examination with variance-based global sensitivity analysis

•Uncertainty quantification of flood modeling in urbanized area with GSA method.•Model construction with public-accessed data sources and GPU-based computation.•Influence and pairwise interaction of the input factors of hydrodynamic modeling.•Dependence of the influence and interaction on the acting area of the input factors.•Antagonistic effects of factors of the underlying urban surface and drainage loss.