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<br />of flooding (damage centers, damage potential, frequency of flooding). <br />The 'flood control system' to be formulated consists of the reser- <br />voirs and their operating characteristics. System formulation is <br />pursued by manipulating the components of the 'system', e.g., the <br />size and location of reservoirs and observing the different effects <br />on the other system elements, e.g., hydrology, costs, benefits, and <br />performa nce. <br />Reservoir flood control systems offer great opportunities for <br />multi-purpose development. Joint reservoir costs can be shared for <br />such purposes as water supply, low flow regulation, and hydropower <br />generation. To the extent the flood runoff is seasonal, joint use <br />may be made of storage space within the reservoir. Even though most <br />reservoir projects that become system components are multi-purpose, <br />this paper will focus of necessity on reservoir flood control as if <br />it were a separable feature of multi-purpose systems. Integration <br />of other purposes into a multi-purpose system is obviously desirable <br />and requires a siMilar systems viewpoint and analysis framework for <br />each purflose. <br /> <br />MODELING FLOOD CONTROL SYSTEMS <br /> <br />Simulation of the operation and performance of flood control <br /> <br /> <br />systems requires that the physical, economic and hydrologic elements <br /> <br /> <br />of the system be translated to mathematical functions, and that <br /> <br /> <br />these functions be coded into a computer program, and that the <br /> <br /> <br />5 <br />