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Rocky
Reach Project  In
August 2000, as part of a plant optimization program, Chelan County PUD
required index tests and absolute flow measurements at selected turbines.
As several of these were bulb units with very short and rapidly converging
intakes, the ASFM was chosen because of its ability to measure flow using
unobtrusive acoustic paths oriented directly across the intake. The results
confirmed that the ASFM will deliver accurate, absolute discharge measurements
under these difficult hydraulic conditions. Back Chelan County's own Rock Island Web-Page 
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Innovative Solutions for Hydro's most challenging Flow Measurements
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Flow
measurements on four units at Rocky Reach in January, 1992, were the first
commercial use of a prototype ASFM. The ASFM was selected by Chelan's
personnel because the previously used arrays of current meters were time-consuming,
costly and subject to flow interference from the support frame. The ASFM
flow measurements were obtained rapidly and accurately and the results
were used by the client as input into a downstream migrant fish bypass
project.