The optimization of the FSL, the water conveyance system and the installed capacity of the plant were undertaken as economic analyses with results expressed as economic costs and benefits. Conceptual layouts were developed for each alternative from which cost estimates were prepared. The power benefits were determined for each alternative and compared with the costs. The objective was to determine the element size, which maximizes the benefits of power supply and the discounted benefit/cost ratios. At this point, any further increase in size becomes uneconomical.
The sizing of the spillway and the determination of the full supply level were more influenced by physical constraints related to the ability to pass fiood flows and the live storage requirements than to a strict evaluation of net benefits as described in the ensuing sections.
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