Advanced sensitivity analysis of the impact of the temporal distribution and intensity of rainfall on hydrograph parameters in urban catchments

Abstract. Knowledge of the variability hydrograph outflow from urban catchments is highly important for measurements and evaluation operation sewer networks. Currently, hydrodynamic models are most frequently used modeling. Since a large number their parameters have to be identified, there may problems at calibration stage. Hence, sensitivity analysis limit parameters. However, current analytical methods ignore effect temporal distribution intensity precipitation in rainfall event on catchment hydrograph. This article presents methodology constructing simulator (volume maximum flow). For this purpose, uncertainty results obtained with use GLUE (generalized likelihood estimation) method were used. A novel was also developed, which can stormwater networks underground infrastructure facilities. Using logistic regression method, an innovative coefficient proposed study impact model depending rainfall, origin (on Chomicz scale), estimated coefficients The developed enables identified SWMM (Storm Water Management Model) runoff hydrograph, taking into account local conditions, not been analyzed thus far. Compared currently methods, analyses included calculation. aspect has taken far, although approach evaluates reliability simulation results. indicated considerable influence factors. greater were, lower Additionally, calculations confirmed significant coefficients. In context analysis, interpretation relationships obtained. presented widely applied stage appropriate selection hydrographs identification validation indicate suitability including models, different sensitivities normal, heavy, torrential rain types. context, it necessary first divide data by origin, will performed, calibration. Considering calculations, identifying validation, conditions should because, caused heavy values much than ones. Taking obtained, only cover episodes high intensity, since lead calculation errors applying practice (assessment system operating design reservoirs flow control devices, green infrastructure, etc.).