1. Professor, Dept. of Civil Engineering, Univ. of Nebraska-Lincoln, Lincoln, NE 68588; presently, Dept. of Meteorology, Eötvös Loránd Univ., 1/A Pázmány sétány, 1117 Budapest, Hungary.
2. Senior Consultant Engineer, Middle-Danube-Valley Inspectorate for Environmental Protection, Nature Conservation and Water Management, 10-12 Nagydiófa St., 1072, Budapest, Hungary (corresponding author).