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    <title>A Case Study in Hierarchical Control - The Upper Vistula Multireservoir System</title>
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    <abstract>Water resource systems have been an important part of resources and environment related research at IIASA since its inception. As demands for water increase relative to supply, the intensity and efficiency of water resources management must be developed further. This in turn requires an increase in the degree of detail and sophistication of the analysis including economic, social and environmental evaluation of water resources development alternatives aided by application of mathematical modeling techniques, to generate inputs for planning, design, and operational decisions. 

This paper is part of the comparative studies on operational decisionmaking in the multiple reservoir water resources systems initiated in 1979 by the &quot;Regional Water Management&quot; Research Task of the Resources and Environment Area of IIASA. 

Following introduction to some basic concepts of a hierarchical approach to the control of complex systems, the model of the Upper Vistula System in Poland is presented and the results of preliminary computations are discussed.</abstract>
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