Modeling and Decision Analysis with Multiple Objectives of Water Quality Management Problems

The Decision Making in the field of water resources management represents a task of high importance and responsibility due to the following reasons: 1. The indispensable participation of a number of state and municipal institutions is required in this process. In Bulgaria, for example, these are the depai tments of the Ministry of Regional Development and Public Works (MRDPW), the Ministry of Environment and Water (MEW), the district and municipal administrations. The participation of private organizations as construction companies, investors, consulting organizations, etc., is also possible. 2. The decisions are made and are intended to be in force within a relatively long period - 20, 30 and more years. This means that once they have been approved and implemented, to change them or make corrections in them would be neither easy and cheap or rapidly accomplished in time. 3. The areas, 'affected' by these solutions, as a rule are large geographic regions, economic districts, human resources. Indirect influence is also exerted on the business-economic relations of the whole state. 4. The realization of any of these decisions requires significant investments, the greater part of them being in principle state resources.