AbstractThis paper describes the application of the HEClF conceptual model for flood-flow forecllllting and warning to the Venetikos river basin in Northwestern Greece, a region suffering from frequent and hazardous Bash floods. The extremely uneven and nonuniform spatial rainfall distribution in the study region forced the modification of the initial lumped version of the model and its application in a semidistributed manner, Such as by dividing the entire basin into three subbasins with different geomorphology and spatial rainfall patterns. The model is shown to perform better in the semidistributed than in the lumped mode, thus juatifying the modifications adopted and supporting application of the flood-flow forecasting model in a fully distributed manner on a 4x4 km2grid network combined with omite and remotely .ensed radar rainfall input information. Preliminary results from current research on thi. integrated application suggest that the model’s forecasting performance may be further improved.