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A New Empirical Approach to Calculating Flood Frequency in Ungauged Catchments: A Case Study of the Upper Vistula Basin, Poland

1
Department of Sanitary Engineering and Water Management, University of Agriculture in Krakow, Mickiewicza 24–28 Street, 30-059 Krakow, Poland
2
Department of Land Reclamation and Environmental Development, University of Agriculture in Krakow, Mickiewicza 24–28 Street, 30-059 Krakow, Poland
*
Author to whom correspondence should be addressed.
Water 2019, 11(3), 601; https://doi.org/10.3390/w11030601
Received: 5 March 2019 / Revised: 18 March 2019 / Accepted: 19 March 2019 / Published: 22 March 2019
(This article belongs to the Special Issue Flood Modelling: Regional Flood Estimation and GIS Based Techniques)
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Abstract

The aim of the work was to develop a new empirical model for calculating the peak annual flows of a given frequency of occurrence (QT) in the ungauged catchments of the upper Vistula basin in Poland. The approach to the regionalization of the catchment and the selection of the optimal form of the empirical model are indicated as a novelty of the proposed research. The research was carried out on the basis of observation series of peak annual flows (Qmax) for 41 catchments. The analysis was performed in the following steps: statistical verification of data; estimation of Qmax flows using kernel density estimation; determination of physiographic and meteorological characteristics affecting the Qmax flow volume; determination of the value of dimensionless quantiles for QT flow calculation in the upper Vistula basin; verification of the determined correlation for the calculation of QT flows in the upper Vistula basin. Based on the research we conducted, we found that the following factors have the greatest impact on the formation of flood flows in the upper Vistula basin: the size of catchment area; the height difference in the catchment area; the density of the river network; the soil imperviousness index; and the volume of normal annual precipitation. The verification procedure that we performed made it possible to conclude that the developed empirical model functions correctly. View Full-Text
Keywords: empirical model; catchment descriptors; flood frequency; ungauged catchments empirical model; catchment descriptors; flood frequency; ungauged catchments
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Młyński, D.; Wałęga, A.; Stachura, T.; Kaczor, G. A New Empirical Approach to Calculating Flood Frequency in Ungauged Catchments: A Case Study of the Upper Vistula Basin, Poland. Water 2019, 11, 601.

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