TAILIEUCHUNG - Wiley wastewater quality monitoring and treatment_8

Tham khảo tài liệu 'wiley wastewater quality monitoring and treatment_8', ngoại ngữ, anh văn giao tiếp phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Comparison of Flow Measurement Techniques 139 Sydney and in a 1 m wide rectangular flume at the River Hydraulics and Hydrology Section of the Civil Engineering Research Institute of the Hokkaido Development Bureau in Japan. Many of these tests were done over long periods involving a range of flows and for all these tests the average error between the ADFM flow measurement and those of the laboratory rating or dye was less than 2 . The ADFM has been found to be highly accurate in a wide range of tests without at-site calibration. The disadvantage of the ADFM is moderately high cost three to four times that of Doppler AVFMs . When choosing between AVFMs and the ADFM the potential cost of inaccurate measurements should be weighed against the extra cost of the ADFM. One case where high accuracy was sought was the Thames Tideway Study of the large combined sewers from the London UK area that drain into the Thames River for which 18 ADFMs were deployed and have provided high accuracy at sites with very complex hydraulics Curling et al. 2003 . COMPARISON OF FLOW MEASUREMENT TECHNIQUES In 1995 the US Geological Survey USGS in cooperation with the Federal Highway Administration outfitted a 61 m length of straight 137 cm diameter slope concrete storm-sewer pipe in Madison WI USA with multiple instruments for the purpose of comparing these instruments. The details and results of this study are briefly summarized in Church et al. 1999 . However additional details of this field test were obtained as a written communication from . Owens of the USGS Wisconsin Water Science Center . Owens personal communication 1998 . Because this field test involved three of the previously discussed flow measurement techniques it is presented as a separate section. Owens . Owens personal communication 1998 reported that the test site had the following characteristics that are typical of storm sewer locations where discharge monitoring may be desired 1 The concrete pipe sections

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