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Open Flume Within this range of options, it is difficult for the engineer to identify the best unit(s) for a site in advance of the bidding process. He can utilize pre- liminary quotation and performance data obtained from the various manufacturers to narrow. the range; however, he runs the risk of eliminating the most attractive type and combination of unit(s) due either to market factors or to out-of-date, inaccurate, or overly conservative/liberal quotations and perfor- mance data. If the project schedule permits, a good procedure for selection involves the preparation of a performance- oriented turbine generator bid package based on flow and head conditions at the site. This package should include sufficient prescriptive clauses to ensure con- formance to. local code requirements and desired quality standards, as well as specific site constraints. The manufacturers then have the opportunity to propose various combinations and types of units to take advantage of the unique cost and performance characteristics of their product lines. However, it should not be assumed that they will necessarily take advantage of this opportunity, particularly if their sales/applications engineers are flooded with requests for quotations. At the present time, the best procedure for equipment selection probably lies somewhere between the tradi- tional method and site-specific bid quotations from manufacturers. This is partly because the market for standardized, pre-engineered, turbine generator units is not well established. The number of such units actually sold and delivered is reasonably small. Many manufacturers have not invested the development time and expense to completely pre-engineer their product lines. Furthermore, by overlapping the equip- mentselection and civil-works design tasks, the design 32