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This paper deals with the methodology used for conducting a water resources assessment as the core component of water resources master plans. It is basically a quantitative and qualitative water resources balance (WRB) and an essential element of any short or long-term planning of sustainable and environmentally sound river basin development and management. The use of a water resources management balance instead of the water resources balance (water budget) that includes the water withdrawals and discharges in the balance equation should be favoured in water resources assessment. By using a water resource management balance, the multiple use of a given volume of water is accounted for so that it is possible to satisfy larger water demands than by using the natural water budget approach. This approach forces planners to look at a much wider scope of alternatives (reservoirs versus water recirculation and conservation for example) to meet the demands and also reinforces the role of water quality in water resources assessment.

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The state of the art approach to environmental protection and management calls for the implementation of major multipurpose environmental protection systems and a wide scope of preventive measures. Since environmental protection falls within the scope of problems collectively known as “externalities” which justify government intervention, i.e. the implementation of the required measures, it is the responsibility of the government to ensure that adequate data is collected and analyzed prior to any decision making pertaining to environmental protection. It is this responsibility of the Government and the constitutional right of the people to live and work in a healthy environment that are the basis of the development of a Federal Integrated Cadastre of Polluters. The integrated approach requires a substantial increase in the amount of information and data on which the planning decisions of the future will be based. It is this need for information and data necessary for the implementation of the state of the art forecasting, planning and management (decision making) that brought about the development of the Integrated Cadastre (Inventory) of Polluters in the Danube basin in Yugoslavia. This paper presents the methodology used in the development of the integrated cadastre and gives a brief review of the structure of the information system used to manage the integrated cadastre.

The paper describes specific changes in the quality of the Danube river water under the conditions of backwater effects in the Hydropower Plant Djerdap I storage. The results of longterm tests in five profiles of the investigated section, at various discharges give a global view of the intensity of changes in the composition of water mass. The analysis included changes in the contents of: organic matter, oxygen regime, reduction of turbidity and changes in the composition and abundance of plankton. The specific changes in the domain of physico-chemical and biochemical processes and changes in the biological status of the watercourse (composition and structure of plankton) at varying retention times complete the picture of short-term changes in the investigated system. Presentation of some settling effects and processes in the sediment of the storage provides an idea of some long-term changes in the conditions of backwater effects of the Danube in the investigated section.