A regional model was developed in the present study for the determination of the flow duration curve
at ungaged catchments, in western and northwestern Greece, which is a hydrologically homogenous
region. A flow duration curve indicates the water availability at a site and is important for the
estimation of the hydropower potential. A flow duration curve was generated for each of seven
available stations at different rivers and then the parameters of the flow duration curves were
correlated with geomorphological and climatic characteristics of the drainage basins for the
derivation of the equations of the regional model. The model was verified using three hold out
stations, in which the error ranged from 0.3 to 1.1%.