This article is concerned with surface water quality with regard to the identification of its main factors influence on water quality state on the basis of two selected low-retention reservoirs in the Podlaskie. The aim of the work was to evaluate the pollution level in the reservoirs in Korycin and in Wasilków, and also to determine the seasonal changes in the contents of the selected physio-chemical indicators in characteristic measurement and control points of the reservoirs, from April 2007 to March 2008. There are many factors which affect the quality of the water in the reservoirs, for instance the natural processes of self-purification which occur with the participation of plant and animal organisms. The progress of the process being in the reservoirs as well as water outflowing quality depends on the water contamination degree that supply the reservoirs. The highest concentration of the analysed parameters were obtained in the reservoir in Wasilków. The water in Korycin had better quality. Most of the analysed physic- chemical indicators of water in both reservoirs were equivalent to I/III quality class, but colour, phosphates and COD-Cr were the disqualifying parameters of water quality. The reservoir in Korycin indicates a self-purifying capacity, whereas it was ...
The research work contains estimation of the low-retention reservoirs, Jasionówka and Czapielówka, pollution level. Both reservoirs are located within the region of Green Lungs of Poland in the Podlaskie region. The Czapielówka impounding reservoir, in the examined period of time, had higher level of phosphates abundance, in comparison to Jasionówka reservoir. Concentration of all inorganic forms of nitrogen in the surface layer, in both water regions meets standards of first quality class. In the aspect of iron and manganese we can classify both reservoirs to the second class. Considering the concentration of organic compound (presented as CODMn) in both reservoirs met the norms characteristic for third class. Considering CODCr, Jasionówka low-retention reservoir met standards characteristic for fourth class, and Czapielówka- for fifth class of surface water quality. Color indicators in both analyses water regions were characteristic for fourth/ fifth class. The analysis of investigated factors showed, that Jasionówka Water Reservoir characterized lower level of trophic state than Czapielówka Reservoir. ...
