The aim of the paper was to evaluate the possibility of use a geomorfoclimatics instantaneous unit hydrograph based on Clark’s model GcIUH-Clark for simulation of runoff. Results got from the model were compared with classical Clark’s instantaneous unit hydrograph IUH Clark. The analysis were made for two rainfall-runoff episodes which were recorded in Godowa gauging station on Stobnica river. All simulations were made with use of HEC-HMS 3.4 application. The analysis showed usefulness of GcIUH Clark’s model for simulation of runoff, but better results were got from classic IUH Clark’s model. Because of the fact that GcIUH-Clark parameters of catchment depend on geomorfoclimatics characteristics, this model could be used for flood simulation in uncontrolled catchments.

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