1. Research Engineer, Dept. of Civil Engineering, Div. of Water Resources, Hydraulic and Maritime Engineering, Laboratory of Hydrology and Water Resources Management, National Technical Univ. of Athens, 5, Iroon Polytechniou, 157 73 Athens, Greece.
2. Professor, Dept. of Civil Engineering, Div. of Water Resources, Hydraulic and Maritime Engineering, Laboratory of Hydrology and Water Resources Management, National Technical Univ. of Athens, 5, Iroon Polytechniou, 157 73 Athens, Greece.