For forecasting of the change of water quality in Ukrainian part of Danube delta the geographic information system (GIS) of the ecological monitoring had been designed. To this GIS a number of functions had been added including the function of the analysis of the temporary rows of observation results. By means of designed GIS the main trends of the change of the water quality for period, since 2004, have been identified. For majority of the water quality parameters the trends to improvement of water quality have been identified. The trend to deterioration of water quality has been identified for manganese concentration only. Increasing of manganese concentrations existed already in the inlet checkpoint of Ukrainian part of Danube delta (above Reni).
For forecasting of the change of water quality in water object the geographic information system (GIS) of the ecological monitoring had been designed. The geographic information system was applied to analyze the water quality of the Danube and Seversky Donets. With the help of GIS, the main trends of changes in water quality indicators of the Danube Delta were identified. In the Danube River, for the most part, there was a tendency for improvement of water quality during the study period, the tendency for deterioration of water quality was determined only by the indicator of manganese. The tendency for deterioration of water quality was observed in the Siverskyi Donets River by the following indicators: suspended matter and ammonia nitrogen. The main trends of changes in water quality indicators have also been identified in the lakes (Chaika, Lychevoe), which influence the formation of water quality of the Siverskyi Donets River. In Lake Chaika there is a tendency to deteriorate in quality: weighed substances; nitrogen nitrate, chlorides and iron. In this case, the values of some indicators in Lake Chaika (BOD-5 and total iron), in Lake Lichovo (COD, BOD-5, nitrite nitrogen) and in the Siverskyi Donets River (overlying districts, ammonium nitrogen) will be several times higher fishery maximum permissible concentration.
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