FLUME

PARSHALL, PALMER BOWLUS, AND "H" FLUMES Primary Devices for Open Channel Flow Measurement FEATURES: The Palmer-Bowlus constricts the flow vertically and horizontally and can be molded to be inserted into an existing half-round pipe. The Parshall flumes constrict primarily horizontally, and are design for rectangular or trapezoidal channels. "H" flumes attach to the ends of pipes where the water is free-falling. Product Description Global Water offers water flumes constructed of high quality polyester resin and fiberglass.  These flumes are durable, highly accurate, and easy to install.  Global water offers primary device flumes that constrict an open channel's flow either horizontally or vertically or both.  Once the flume flow is backed up behind the constriction, there is a defined relationship between the upstream water level and the open-channel flow through the constriction.  This relationship can be determined either by an equation or a look-up table. Global Water offers three standard molded flumes: the Palmer-Bowlus Flumes, the Parshall Flumes, and the H Flumes. The Palmer-Bowlus constricts the flow vertically and horizontally and can be molded to be inserted into an existing half-round pipe.  Click HERE for Diagrams and Palmer Bowlus flume table of Dimensions. The Parshall flumes constrict primarily horizontally, and are design for rectangular or trapezoidal channels.  Click HERE for Diagrams and Parshall flume table of Dimensions/Flow Data. H flumes attach to the ends of pipes where the water is free-falling.  Click HERE for Diagrams and H-flume table of Dimensions. Installation For a flume to work properly, there must be freely flowing water out of the flume.  The flow cannot be backed up downstream or the reading will be erroneous and misleading.  Make sure that you have free-flowing water without major inflows downstream of the flume.  The open channel flow measurement can be made by using a float in an adjacent stilling well, a pressure transducer, or by an ultrasonic sensor. Options  Contact Omni Instruments directly to obtain a quote for the following flumes: The Palmer-Bowlus constricts the flow vertically and horizontally and can be molded to be inserted into an existing half-round pipe.  Click HERE for Diagrams and Palmer Bowlus flume table of Dimensions. The Parshall flumes constrict primarily horizontally, and are design for rectangular or trapezoidal channels.  Click HERE for Diagrams and Parshall flume table of Dimensions/Flow Data. H flumes attach to the ends of pipes where the water is free-falling.  Click HERE for Diagrams and H-flume table of Dimensions. We recommend using the Water Level Logger Flume and Weir Option with Global Water flumes.