The major floods are those resulted from pouring rain, and they exceed through their volume the floods resulted from the melting snow and even those resulted from pouring rains and melted snow combined. According to hydrological specialized literature, it is emphasized the fact that the summer pouring rains generate floods which get over those already existent, regrdless of their genesis. The determination of maximum run off is usually realized on small basin areas, without taking into consideration the interbasinal areas. The interbasinal areas are characterized by great water contribution coming from pouring rains. The determination of this kind of areas represent the object of the study below.

Keywords: floods, maximum runoff, hydrology, interbasinal