The St. Anthony Falls Hydraulic Laboratory performed field flow
measurement tests on two large meters for the Metropolitan Waste Control
Commission (MWCC) at the Metro Waste Treatment Plant in August and
September 1990. These two 72-inch magnetic flow Dieters, designated MOOIA
and MOOID, were retested by SAFHL in May and June 1991. After the
earlier round of testing, the removal of considerable amounts of scum and grit
from upstream. of the meters necessitated retesting in order to determine if the
build-up had affected the accuracy of the meters. The tests were completed
as a subcontract to James M. Montgomery Consulting Engineers, Inc., of
Wayzata, Minnesota, with whom the MWCC had contracted to conduct an
overall evaluation of these and other meters.
The meters were tested using the dye dilution technique for which dye
was injected just downstream. of gate 454. Continuous monitoring of the
effluent and withdrawal of discrete samples was done at the metering tunnel
discharge location into the east primary influent channel (See Fig. 1).
Throughout the testing process all dye dilution samples were analyzed
separately using fluorometers operated by both SAFHL and the research and
deVelopment staff at the MWCC. Further insight into the dye dilution
metering theory, as well as field procedures and complete results of the initial
testing, may be found in the St. Anthony Falls Hydraulic Laboratory Project
Report No. 311
James M. Montgomery, Consulting Engineers, Inc.; Metropolitan Waste Control Commission
Voigt, Richard L.; Bauers, Curtis.
Field Flow Testing of Four Large Primary Influent Meters, Twin Cities Metro Waste Treatment Plan.
St. Anthony Falls Hydraulic Laboratory.
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