P.O. Box 737 Aromas, Ca 95004-0737 (408) 726-2644
The Palmer Bowlus metering flume has been widely used since 1937 for
measuring water and waste water in open channels or pipelines that are
not under pressure. Some of its most important characteristics include
measurement accuracy, low energy loss and minimum flow restriction.
The Palmer Bowlus is best used in "U" shaped or circular channels, such as storm drains and sewers. This convenient flume requires no redesign or special modification of channels for installation.
The accuracy of Palmer Bowlus flumes is comparable to that of Parshall or other types of venturi flumes. In normal applications it is generally superior to that of weirs. Experiments indicate that within the normal range of flows (from under 10% to 90% of pipe capacity), the errors are less than 3%.
Parshall flumes are available in one piece construction or in easily
assembled panel design. Where access to the proposed location is limited
or the overall size of the flume makes transportation difficult, the
flumes are constructed of three or more pieces.
Parshall flumes are best used in channels having rectangular or trapezoidal cross-sections. Extreme care must be taken when using them in circular channels. Parshall flumes have two-inch wide flanges on top and ends. The end flanges can be used for bolting to companion structures or for anchoring in concrete. External reinforcing ribs give added rigidity.
ACCURA-FLO Parshall flumes are available with inlet and/or outlet adapters. Nested flumes are also available.
ACCURA-FLO Parshall flumes have been selected by leading consulting engineers, public agencies, and industrial plants for use in:
ACCURA-FLO Parshall flumes offer distinct advantages:
From torrents to trickles, the H Flumes can accurately measure flows that vary widely throughout the year. These flumes exhibit the dynamic range of up to 27,000:1.
The Flumes fall into three series (H, HS HL) as shown on the capacity table. The flume size is equivalent to the depth of the inlet end.
The approach channel is rectangular in cross section, with the same width an depth as the flume entrance. The length of the approach channel is five times the flume size. The flume must be installed level. The approach channel may have a slope of 2% or less, and the flow approaching the flume must be tranquil and sub-critical.
As the flow exits the flume it must spill clear so that there is no submergence (backup into the flume).
StandardACCURA-FLO flumes are available in fiberglass reinforced polyester. Vinylester is available for special corrosion resistant applications.
Provisions for use with floats, bubblers, capacitance probes, or ultrasonic transducers can be made. Anchor clips for locking into concrete can be included.
ACCURA-FLO flumes can be furnished with or without attached or detached wells. One or more wells may be located on either side of the flume as required. With detached wells, pipe connections will be provided at the proper location.