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The purpose of this study is to make a hydrologic modelling type of rain–flow on watershed of wadi Cheliff-Ghrib, by means of HEC-HMS model. Afterwards, this model is used to predict hydrologic response of the basin to the climate changes scenarios and land use. The model calibration was made in two phases; the first one is to select events, formalism of transfer function and appropriate NRCS downpour. The second is to deduce optimised parameters set which is used in validation. By using optimised parameters set, we were able to predict impact of quantiles downpours, changes in land use due to urbanisation, deforestation and reforestation on the peak flow and on runoff volume. Towards the end, we reconfirmed that influence of land use decreases for extreme storms

Modelling of the rain–flow by hydrological modelling software system HEC-HMS – watershed’s case of wadi Cheliff-Ghrib, Algeria