THE ASSESSMENT OF EXPECTED DAMAGE CAUSED BY FLOODS – THE USE OF THE KRPAN METHOD

Abstract

In this paper, the application of the unified method of estimation of benefits of constructional and non-constructional measures for flood risk reduction is presented in two case studies. The method is included in the KRPAN application which was developed within the scope of the project. The program is user-friendly, since it does not require any special computer knowledge, and the calculation procedure of the expected damages is relatively fast. The aims of the KRPAN application are to help designers and those preparing investment documentation, and to support decision-makers on the feasibility of planned flood risk mitigation measures in the economic and financial justification of projects. The expected annual damages were calculated for sections of the Gradaščica and Dravinja river catchments. In each case study, the calculations were made for the situation before and after the implementation of flood protection measures. The calculations confirmed that the updated method is in accordance with the requirements of the contracting authority. However, it should be emphasized that the basic and upgraded method, as well as the computer program, were developed for the whole territory of Slovenia, so some of the input data had to be generalized. Nevertheless, the output of the detailed results in a spreadsheet allows more detailed analyses, on the basis of which it is possible to further clarify and/or justify the importance of the measure for the development and flood risk reduction of the area.