Abstract
The aim of the article is to assess the variability of the risk of flood risk with the use of distributions maximum values. The copyright research is hydrological data in the form of daily water levels from the period 1981-2011. The collected data are derived from the hydrological station Bystrzyca Klodzka for the Nysa Klodzka river and the hydrological station Lesna for the Kwisa river. For the purpose of estimating flood risk from the collected data has been selected quarterly maxima of daily water levels. As a measure of the flood risk authors accepted the likelihood of exceeding the alarm condition in the test sections of the rivers. This risk is calculated by using the theoretical cumulative distribution distribution of quarterly highs water levels. The study was used Gumbel distribution. At the same time the article was paid significant attention to the possibility of using the solutions for integrated flood risk management process in accordance with applicable national legislation and European.
Highlights
In order to more broadly understand the complex nature of the course of floods in some cases a closer description of the Kłodzka land as an area in south-western Poland in Central and Eastern Sudetes was made
At the measuring point for the Kwisa river at the gage Leśna as well as for the gage Bystrzyca Kłodzka on the Nysa Kłodzka river the risk dynamics in 1991-2000 period compared to the 1981-1990 period was higher than in comparison with the 2001-2011 period
The current actions should be carried out on the basis of the risk measures based on the results of the monitoring network
Summary
In order to more broadly understand the complex nature of the course of floods in some cases a closer description of the Kłodzka land as an area in south-western Poland in Central and Eastern Sudetes was made. It is characterized by varying morphology of the terrain and by its hydrographic network. Due to large declines of river banks and river beds as well as high density of valley floors the reception the basin of the Nysa Kłodzka quickly responds to heavy rain with violent floods and high flows. Major floods do not last longer than two or three days and small ones - from a few to several hours [1].
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