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Abstract

After presentation of the characteristics of a water reservoir in CaCO3 excavation pit, called the Turkusowe Lake, situated in the Wolin National Park on the Wolin Island, available results of the analyses referring to the quality of surface water of this water reservoir and being carried out since 1986 as well as those of own studies being carried out from 1999 to 2010 were gathered, collecting this way a research material covering the quarter-century 1986-2010. It was shown that the Turkusowe Lake is a water reservoir being resistant by nature to eutrophication (lake basin development and depth, surrounding by the heights adhering to it, and presence of CaCO3 building the lake basin), whereas an increase in the trophic level and development of eutrophication phenomena in the form of weak phytoplankton blooms being observed, particularly in 2005-2010, is connected with increased anthropogenic pressure in the form of direct discharge of municipal sewage to the lake and waste-water to the soil in the alimentation zone of underground waters feeding this lake. The extent of anthropogenic pressure was so big that it started to prevail over the natural processes limiting an increase in the trophic level in this lake.

Abstract

Environmental impacts of oil spills affecting urban sewage networks can be eliminated if timely intervention is taken. The design of such actions requires knowledge of the transport of surface pollutants in open channels. In this study we investigated the travel time and dispersion of pollutants by means of tracer experiments in sewage networks and a creek. The travel time of surface tracers has been found to be significantly shorter than that of a bulk flow tracer. The ratio of the travel times of a bulk flow tracer and surface tracers agreed with the known correlations obtained for rivers. An increasing tendency in the ratio of travel times has been observed for increasing bulk flow velocity. A segment-wise dispersion model was implemented in the existing hydraulic model of a sewer system. The simulation results were compared with the experimental observations. The dispersion rate of the bulk flow tracer has been found to obey Taylor’s mixing theory for long channels and was more intensive than that of surface tracers in community sewage channels.

of the hydrologichydraulic Model SWMM to simulate runoff (case study: Gorgan). J. Watershed Manag.Res., 7(14): 1-10 (in Persian with English abstract). Chen J., Hill, A.A. & Urbano, L.D. (2009). A GIS-based model for urban flood inundation. J.Hydrol., 373(1-2): 184-192, DOI: 10.1016/j.jhydrol.2009.04.021 Dalir, A. (2009). Simulation of sewage network performance during rain fall using of MIKE SWMM and Arc view model combination (case study partial of Mashhad sewage network), Master’s thesis, Water trend, Ferdowsi University of Mashhad, 195 p. Dongquan, Z

by Country, Volume 23, Rome, 2003 Fatih D., Rod T., Jantien S., Christian L., Hendrik P., Peter O., Sisi Z., 4D cadastres: First analysis of legal, organizational, and technical impact—With acase study on utility networks , Land Use Policy, 2010 Isabelle S., GIS for maintaining and repairing water and sewage network , Prezentare Veolia Water Romania, București, 2012 Luca M., Bălan A., Toma D., Apetroi I., Avram M., 2015, The adduction pipes management on limiting water loss , Proceedings IWA Regional Conference “Water Loss Management 2015”, ARA Publishing

in wastewater inflow to the treatment plant in Nowy Targ. Journal of Water and Land Development. No. 35 p. 11–17. DOI 10.1515/jwld-2017-0063. C hmielowski K. 2016. Zagadnienia prawne związane z POŚ – cz. I [Legal issues related to HTP – part I]. Przegląd Komunalny. Nr 2 p. 58–60. Ć wiertnia R. 2004. Prawidłowy wskaźnik jednostkowego zapotrzebowania wody – podstawa optymalnego zaprojektowania sieci wod.-kan. oraz obiektów wodociągowych i kanalizacyjnych [Correct unit water demand indicator – the basis for optimal design of the water and sewage network and water

it. It is also important that households and industry limit water consumption through the spreading of modern pro-ecological technologies. These factors directly favour the greening of a city. Studies on urban water and sewage management focus on technological, technical, environmental and socio-economic aspects. Technological and technical issues relate to practical guidelines for engineers for constructing urban water and sewage networks ( Todini, 2000 ; Pape, 2008 ; Coutts et al., 2013 ; Rojas-Torres et al., 2014 ) and the best water treatment and

public transport infrastructure) and construction and modernisation of roads (16 FUAs). Activities related to thermomodernisation also have been enjoying popularity for many years (19 FUAs). In this context, it is disturbing that activities related to support using renewable energy sources will be conducted only in 5 FUAs. It is also disturbing that, in the conditions of the vast disproportion in the provision of water supply and the sewage network, ITI unions mostly supported the expansion of the water supply network (11 FUAs), and to a much lower extent (only 4 FUAs