The Metro Waste Control Commission (MWCC) of St. Paul has
installed Parshall flumes in sewer manholes at various locations to. monitor
the discharges. The Parshall flume is an accurate measuring device for open
channel flow when installed as specified in the standard manuals. This calls
for ideal approach conditions, which may not always be possible in manhole
installations. The MWCC proposed to investigate the accuracy of Parshall
flumes in these installations. A literature search revealed very little
definitive information on the effect of adverse approach flow conditions on
the accuracy of discharge· measurements. A study of Parshall flume
calibrations for various approach geometries was initiated. A commercially
available reinforced plastic flume with a 12-inch throat was used. This
report summarizes the studies.
Dahlin, Warren Q.; Wetzel, Joseph M..
Parshall Flume Calibrations Approach Studies 12-inch Throat.
St. Anthony Falls Hydraulic Laboratory.
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