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Lakes located in urban areas and near urban agglomerations is an important interface between on the one hand, the geographic areas, and, ecology on the other. This determines to be necessary strategic environmental approaches in urban development and in-depth knowledge of the complex issues of urban lakes, such as: flood behavior, the existence of pollution sources, the water quality status, etc. This paper aims to highlight aspects of the water pollution of lakes in Bucharest based on build a conceptual model that includes all relevant information related to the anthropogenic lakes on the river Colentina. All this information allowed to delimiting the study area, as well as 11 control points, respectively locations for sampling and subsequently laboratory analysis of a set of the specific quality indicators for assessing surface water quality. The location of the samples was recorded via GPS, resulting a georeferenced database populated with data that highlight a number of issues related to pollution in urban areas. The main conclusions reveal the existence of the differences both spatial and temporal of the quality status of the lake system analyzed, which are due to the manifestation of a series of the specific factors: local sources of the pollution, the contribution of the rainfall, seasonal changes in water volume throughput lakes etc. The pollution is recorded easily in the sediment accumulation, given that there have been not achieved over time specific maintenance works, such as dredging for lakes in Bucharest.

ELEMENTS OF URBAN ECOLOGY: WATER QUALITY ASSESSMENT OF THE LAKES BUILD UP ON COLENTINA RIVER IN BUCHAREST AREA