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A highly accurate dye dilution testing protocol using Rhodamine WT was developed and used to quantify flow meter accuracy in the Greater Detroit Regional Sewer System. Over 150 tests were performed on 37 flow meters in conjunction with a set of good metering practice principles. A summary
of the accuracy for each of the seven technologies tested observed before and after good metering practice is given. Also presented is a summary of flow meter manufacturer presentations hosted to explore accuracy issues and proper application of six commonly used technologies. The seven technologies
assessed are electromagnetic induction meters (magmeters); full-conduit, multiple-path, transit-time meters; full-conduit, single-path, transit-time meters; openchannel, multiple-path, transit-time meters; open-channel, ultrasonic meters; flumes; and weirs. Many meters that are typically considered
to be accurate had errors of more than 30%. Some meters had errors that exceeded 70%. Overall, the average initial system accuracy for system meters was observed to be ±15.0% of measurement with an overall bias of 6.1% (under-predicting flow). After implementing
the good metering practice principles, and in particular using dye dilution testing as a diagnostic tool, the average accuracy potential observed for the system reduced to ±5.5% of measurement, with an overall bias of 0.6% (under-predicting flow). It is concluded that:
1) there are observable accuracy differences between flow meter technologies, 2) objective standards like dye dilution testing are critical to good metering, 3) verifying installed accuracy is important, even for technologies considered to be highly accurate, and 4) the simplest technology
that can be used is often the best.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.