The study was aimed to verify the selected empirical formulas to calculate SNQ, SSQ and Qminp% flows in four catchments of the rivers: Cicha Woda-Biały Dunajec, Czarny Dunajec, Ochotnica and Wielki Rogoźnik which are located in the Dunajec basin. The verification was aimed to assess the usefulness of the analyzed empirical formulas to calculate minimum and mean flows in relation to current hydrological data. The data were obtained from the Institute of Meteorology and Water Management - National Research Institute and include data string from the period of 1980 - 2009. Hydrometric data were evaluated considering their homogeneity and independence using Mann- Kendall-Sneyers test and the trend analysis was performed using Mann-Kendall Statistic S. The Gumbel's method was used to calculate the probability of not exceeding minimum flow thresholds. Based on the obtained results the comparative analysis was conducted between the calculated values of SNQ, SSQ and real flows from the period of 1980 - 2009. The calculations have shown significant differences between the SNQ, SSQ and Qminp% values calculated by empirical formulas and the values determined based on hydrological data. This justifies the need for verification and updating the empirical formulas used previously for the calculation of minimum and ...
The study was aimed to verify the Punzet formula to flood frequency (Qmaxp) in two rivers: Lepietnica in cross-section Ludźmierz and Koprzywianka in cross-section Koprzywnica. The verification was aimed to assess the usefulness of the Punzet formula in hydrological calculations, in relation to current hydrometric data. The data- the long-term observation records of the annual maximum floods (Qmax) from the period 1980-2013 - were obtained from the Institute of Meteorology and Water Management - National Research Institute in Warsaw. The obtained data were evaluated considering their homogeneity and independence using Mann-Kendall-Sneyers test. Qmaxp was calculated using the statistic method of the Pearson III type distribution with maximum likelihood method of estimating the parameters of distribution.The calculations Qmaxp for the Lepietnica River obtained with statistical methods and the Punzet equation, where Qmax50 was calculated with the Carpathian formula, have shown that differences between the results were insignificant. However, the calculations for the Koprzywianka, where Qmax50 was calculated with the Punzet formula for non-Carpathian plain catchments, have shown substantial differences between the results obtained through empirical and statistical methods.This justifies the need for verification and updating the Punzet formula to calculate Qmaxp in non-Carpathian plain catchments of the upper Vistula basin. ...
The study was aimed assessment of seasonal occurrence of minimum flow (MF) for Kamienica Nawojowska river in cross-section Łabowa - right side tributary of Dunajec, by Colwell indices. Input data obtained from Institute of Meteorology and Water Management, the National Research Institute in Warsaw, were observation series of daily flows for the years 1983 - 2012. Based on obtained data it was computed the basic indices of minimum flow and the following Colwell's indices: predictability (P), constancy (C) and contingency (M). Moreover it was determined of impact of length record and number of classes discharge on values of P.Based on calculations it was concluded that determined for MF of Kamienica river in cross-section Łabowa, value of P at 43% shows predictability below average level. The contingency determines value of P only in 18%, hence that flows are characterized by insignificant seasonality. Moreover it was conclude that length of record has significant impact on values of predictability. But for larger numbers of classes discharges, this dependency was not found. ...
In the article, analysis coefficient of reduction of annual maximum flows for San, Wisłok and Wisłoka catchments was made. Basis of executed analysis was data about annual maximum flows from years 1984-2009 got from IMGW PIB in Warsaw. Data were verified in view of its homogeneity and then, values of maximum flows with probability of exceed were calculated, based on Pearson III type distribution with use maximum likelihood method of parameters calculation. Values of coefficient of reduction of maximum flows were calculated with use following methods: segment values, correlation and dimensionless charts. Analysis showed, that values of coefficient of reduction of maximum flows were statistically significant depending on used method (the highest values were got for method of outliers values). Value of coefficient of reduction depends on the probability of flows -increases with probability increasing. In practical hydrologic calculation, in analyzed area, coefficient of reduction of maximum flow calculated with use method of segment values should be used, also it should not be taken values of n coefficient amounting 2/3 given by Dębski.
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The aim of the paper was to study an initial evaluation of flood risk of Dłubnia river catchment, on section from its sources to Zesławice reservoir. The aim was realized basis on calculations of flows with probability of exceedance in eight cross-sections on Dłubnia river and its inflows. In these cross-sections a group of authors is planning installation of automatic water stage stations. In two of them in autumn of 2014, there were already installed devices for automatic water stage measurement. In all cross-sections, basis on made geodesic measurements, the maximum capacity was made, which was then compared with values of flow with probability of exceedance. Got results were basis to study an initial evaluation of flood risk in Dłubnia river catchment. It was shown, that flows with probability of exceedance equal 20% are not within in the stream channel and its inflows, what signalizes a flood risk. ...
The article contains analysis and evaluation of the impact of clean sewage on sewage treatment plant in Myślenice, in the period 2008 - 201,1 on the physico-chemical composition and water quality of the receiver - river Raba. The analysis conducted based on collected and statistical research: amount and composition of clean sewage and composition of the water receiver in cross-section: Stróże (above of inflow clean sewage) and Osieczany (below of inflow clean sewage). The following pollution index were tested: total suspended solids, BOD5, CODCr, total nitrogen and total phosphorus. Based on obtained results its concluded that in period 2008 - 2011 sewage treatment plant was working properly, what explain quality of clean sewage. What reflected in directly protection of receiver water against pollution. Moreover, based on the results of U Mann Whitney test, concluded that in the both cross-section, composition of the water of Raba river was similar, what explain the results of this test, which didn't show statistically significant differences between average values of concentrations analyzed indicators of pollutions. Based on obtained results its concluded that sewage treatment plant in Myślenice doesn't negatively impact on quality of the water receiver -Raba river. ...
