Parshall flume

Parshall flume

[′pär·shəl ‚flüm]
(engineering)
A calibrated device for measuring the flow of liquids in open conduits by measuring the upper and lower beads at a specified distance from an obstructing sill.
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1 ls of gravity sewer line and manhole testing; 1 ea of connect to existing sanitary sewer; 1 ea of tie-in at oxidation ditch; 1 ea of 48" dia manhole; 23 lf of 10" sdr 26 pvc sewer line; 1 cy of concrete headworks structure; 3 sy of 6" thick concrete slab for screenings container; 1 ea of manual bar screen; 1 ls of mechanical auger screen; 1 ea of 3" frp parshall flume; 165 lf of 2" sch.
Irrigation water of 50 mm (measured with the help of Parshall flume) was allowed to run in each plot at each irrigation.
The Parshall Flume is the most popular for its range of flows and ability to pass flow without taking much energy from it.
Ultrasonic Modules (Isco 710) mounted over each Parshall flume used ultrasonic reflection to measure water level.
Runoff measurements and calculations were subject to instrumental errors including head measurement by the pressure transducer and inaccuracy of the Parshall flume head-flow rate relationship (Equation 1).
Two methods were used in order to measure stream discharge: an area-velocity method using a flow meter and a Parshall flume. Also a topographical survey was made using a total-station theodolite.
Plant effluent flow currently is measured downstream of the secondary clarifier via a Parshall Flume. Visual observations of the Parshall Flume indicate that the system is intermittently operating under submerged conditions.
The wastewater treatment plant is nearly 30 years old, and many of the items needing to be upgraded or replaced have operated beyond their life-expectancy The wastewater enters the facility through a Parshall flume, which is located on the north side of the control building.
Measuring the flow of liquids is done in open channels and involves the use of a weir or Parshall flume or various modifications of these devices.
Tenders are invited for Providing and fixing ni-plast fibreglass reinforced plastic (f.r.p.) parshall flume for measuring discharge at ch.
Variations of the Parshall flume as differential producers include the parabolic flume and Kennison nozzle, in that they are open channel measuring devices.
Tenders are invited for Purchase of parshall flume for research activities