Slide 2 of 9 Notes:  

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As of this date, the GENESYS model only includes a “one-dam” model of the Columbia River Hydroelectric Power System.  Whether using a one-dam or multi-dam model, however, the methodology used to simulate the operation of the hydro system is the same.  Potential hydro energy is divided into separate blocks, each of which has a different value or price.  For example, water above the flood control elevation at a particular dam has little value since it must be spilled if no market for it is available.  Water near the bottom of the reservoir is very expensive because using this block of water in this month would adversely affect operations in later months, including the ability of the system to provide flows for fish migration.