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<br />occurs when a number of reservoirs are being operated for common <br /> <br /> <br />locations and are thus able to take advantage of inflow and release <br /> <br /> <br />timing effects. <br /> <br />necause of the large number of alternative systems possible in <br /> <br /> <br />complex river basins and due to the complexity of evaluating each <br /> <br /> <br />syste~, it is essential that a reasonably structured system formula- <br /> <br /> <br />tion strategy be adopted as the framework for analysis. Since many <br /> <br /> <br />important concerns other than hydrologic and economic performance <br /> <br /> <br />are ultimately involved in the selection of systems for implementa- <br /> <br /> <br />tion, automated optimization methodologies do not presently play <br /> <br /> <br />major roles in formulation of large complex systems. <br /> <br /> <br />Application of a practical flood control reservoir system simula- <br />tion model that yields detailed system operation of all components <br />and summarizes hydrologic and economic performance and costs greatly <br />assists in determining system performance. To perform the simula- <br />tion, the model accepts data on (1) historical or synthetic flood hydrol- <br />ogy, (2) reservoir system storage and operating criteria, (3) reservoir <br />costs, and (4) damage potential at system control points. <br /> <br /> <br />This paper discusses the scope of reservoir system formulation, <br /> <br /> <br />modeling flood control systems, criteria and strategies for system <br /> <br /> <br />formulation and illustrates the concepts with applications in <br /> <br /> <br />recent systems studies. <br /> <br />2 <br />