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Abstract

The aim of this work was to investigate the diversity of diatom assemblages developed in the Przyrwa stream, to assess water quality based on benthic diatoms and to make an attempt at the identification of physicochemical factors having the greatest impact on the differentiation of diatom assemblages. Studies were conducted in 2011-2012 on the Przyrwa stream, a left-side tributary of the Wisłok River flowing through the city of Rzeszów and with its spring section located on the borders of the city. A total of 259 diatom taxa were identified in the Przyrwa stream during three studied seasons. At all investigated sites, the most abundant population consisted of Ulnaria ulna (Nitzsch) Compère, Cocconeis pediculus Ehrenb., Achnanthidium minutissimum (Kütz.) Czarnecki var. minutissimum, Navicula gregaria Donkin, Planothidium frequentissimum (Lange-Bert.) Lange-Bert., P. lanceolatum (Brébisson) Lange-Bert., Navicula lanceolata (C. Agardh) Ehrenb., Amphora pediculus (Kütz.) Grunow, Eolimna minima, (Grunow) Lange-Bert., Melosira varians C. Agardh and Cyclotella meneghiniana Kütz. Based on IPS (Specific Pollution Sensitivity Index) and GDI (Generic Diatom Index) indices, the ecological status of the Przyrwa stream was assessed as moderate to poor (mostly III-IV class of water quality), while the TDI (Trophic Diatom Index) index indicated a poor to bad ecological status (mainly IV-V class of water quality).

Abstract

The aim of the work is the analysis of water consumption in Rzeszow city. The quantity of produced water in Water Plants: Zwieczyca I and Zwieczyca II were performed for years 2007÷2009. The individual average twenty-four hour water consumption per one inhabitant was estimated. A stable decrease was observed in annual water consumption in years 2000÷2009. On the example of housing estate Nowe Miasto, the analysis of water consumption concerning the heights of the buildings was made. The biggest individual water consumption was marked in ten-storey house, and the smallest in single-family house. The next step regard the water consumption depending on the days in week. The biggest water consumption was in Thursdays, and the smallest in Sundays. Also the maximum and minimum twenty-four hour water consumption in the division into months in 2009 year were determined.

Abstract

The aim of the study was to evaluate the possibility of applying different methods of data mining to model the inflow of sewage into the municipal sewage treatment plant. Prediction models were elaborated using methods of support vector machines (SVM), random forests (RF), k-nearest neighbour (k-NN) and of Kernel regression (K). Data consisted of the time series of daily rainfalls, water level measurements in the clarified sewage recipient and the wastewater inflow into the Rzeszow city plant. Results indicate that the best models with one input delayed by 1 day were obtained using the k-NN method while the worst with the K method. For the models with two input variables and one explanatory one the smallest errors were obtained if model inputs were sewage inflow and rainfall data delayed by 1 day and the best fit is provided using RF method while the worst with the K method. In the case of models with three inputs and two explanatory variables, the best results were reported for the SVM and the worst for the K method. In the most of the modelling runs the smallest prediction errors are obtained using the SVM method and the biggest ones with the K method. In the case of the simplest model with one input delayed by 1 day the best results are provided using k-NN method and by the models with two inputs in two modelling runs the RF method appeared as the best.

Peters. 2005. Governing Complex Societies: Trajectories and Scenarios. Hampshire and New York: Palgrave Macmillan. Pollitt, Christopher and Geert Bouckaert. 2011. Public Management Reform: A Comparative Analysis – New Public Management, Governance, and the Neo-Weberian State. 3 rd edn. Oxford: University Press. Resolution No. LXXIV-1337-2014 Rzeszów City Council, of 29 April 2014. Available at http://bip.erzeszow.pl/prawo-lokalne/uchwaly-rady-miasta-vi-kadencji/uchwaly-podjete-w-2014-roku/17073,uchwala-nr-lxxiv13372014 (last accessed 27 August 2015). Rhodes

., Väisänen T. S., Hellsten S. K., Mertikainen P. J., 2006, Methane fluxes at the sediment - water interface in some boreal lakes and reservoirs, Boreal Env. Res. 11: 27-34. Kelly C. A., et al., 1997, Increases in fluxes of greenhouse gases and methyl mercury following flooding of an experimental reservoir, Environ. Sci. Technol. 31: 1334-1344. Koszelnik P., Tomaszek J., Sokół Z., Kryczka R., 2004, Charakterystyka zbiornika zaporowego w Rzeszowiepo trzydziestu latach eksploatacji (Characteristics of the reservoir in Rzeszów City after thirty years of exploitation

of study 2.1 Study area The object of investigations was the water reservoir in Rzeszów, placed in the grounds of Rzeszow city, in the south of the centre, on the Wisłok River. The water reservoir was constructed in 1974 as the water intake for Rzeszów city water supply system, reservoir flood control and the for recreation purpose. Currently, the surface area is 0.68 km 2 and the mean depth is ca. 2 m [Koniarz et al . 2015, Koszelnik et al .2004, Tarnawski, Baran 2018]. 2.2 Sample collection and analysis The samples were collected from five set locations twice