Abstract
The main concern of the study was the evaluation of the impact of new investment in road infrastructure on the flood hazard. The flood hazard is considered here on the basis of maps according to requirements of EU Flood Directive. The analyses presented were made for the Warta river, near the town of Wronki. The procedure included data collection and processing, model configuration, hydraulic simulation, generation of water surface profiles, and flood hazard maps. The ArcGIS tools, as well as HEC-RAS package, were used in this research. The model recalibration described in the paper provided excellent results according to independent criteria. Hence, the results obtained may be considered as valid. Finally the results reconstructing the conditions with and without the bridge are compared. The assessed impact of the bridge seems to be moderate, but the procedure proposed in the presented paper may be of wider application. In view of the EU Flood Directive and plans for investments in road infrastructure, the methodology presented seems very attractive.
Highlights
The impacts of severe floods are huge losses in human life, as well as economic dimensions
In order to assess the potential impact of the bridge planned to be constructed on the flood hazard, simulations were made in the same way as in the ISOK project
The flood hazard maps are generated on the basis of Digital Terrain Model (DTM) and calculated elevations
Summary
The impacts of severe floods are huge losses in human life, as well as economic dimensions. In Europe, in the 20th century, floods directly caused 9500 fatalities and losses assessed at 70 billion euro [1]. The total losses caused by the last two severe floods in 1997 and 2010 are estimated as 26 billion Polish zloty, which is equivalent to over 6 billion euro [2]. In Poland the Directive is implemented in the framework of the project called ISOK Their relation to flood hazard assessment is obvious in many cases. The procedure presented here is aimed at breaking some impasse, which would appear after implementation of the EU Flood Directive. The advantage of the method described is its independence of tools used for development of flood hazard maps in the ISOK project, while maintaining full compatibility with the results determined in this project
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