Supporting technical protection against flash floods by gis methodology

Abstract

One of the most common extreme weather events today is the phenomenon of flash floods caused by storms in convective zones, which affect mountainous and hilly areas in Hungary. The present study analyses the catchments of the Harica stream in Borsod-Abaúj-Zemplén county from the point of view of flash flood risk, and presents an alternative method of protection against floods in the affected valleys. The methodology processes a 5m resolution digital elevation model (DEM), also its uses slope and land use maps which derived from it. As well as a database of the collected records from damaged areas (by the government, by affected settlements, by civilian population). This data come from protocols (so-called vis major protocols) by the Hungarian State Treasury. The main purpose of there search is to support the flood defense managers and to assist the work of civil engineers working in water management.