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The flume is considered submerged when the depth of flow downstream of. If the water level at gauge #2 is higher than indicated the incoming water in a submerged flow condition and the chart will have to be adjusted to accommodate that flow. The Parshall flume for open-channel flow measure- ment.

#Parshall flume for free

Table #2 indicates the flow rate in cubic feet per second under free flow conditions as well as the maximum height at gauge to as compared to the gauge #1 reading for free flow to exist. His early duties included design and construction of laboratory and hydraulic test facilities. This gauge allows a quick visual check for determining whether the flow is in free flow or submerged flow. Parshall joined the Colorado Agricultural College faculty in 1904. The second gauge is set at a point 2” back from the downstream edge of the throat of the flume. This first gauge is for measuring the flow into the system. The first gauge is set at a distance of 2/3 of the wall length of the approach side of the flume as measured from the start of the flume throat toward the inbound flow. Trapezoidal flumes are great for measuring low flows while still allowing for a wide range of flows to be measured. Spagco Parshall Flumes come standard with two built in gauges. Parshall and Trapezoidal flumes were originally designed for ditch or in-channel applications, while the Palmer-Bowlus was designed to connect to a piped system.

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Parshall in 1922 and are shown in attached table #1 plus drawings #1 & #2. All Parshall Flumes are made to same dimensions established by Dr. The superior strength of the sandwich panel construction allow the flume to act as the concrete form as the concrete trench wall are cast with no need for any internal bracing. Due to the high moment of inertia of the wall due to the thickness, no stiffeners or other braces are required. All Spagco flumes have a total wall thickness of 1 ½”. 0.0181 - 1.Spagco Parshall Flumes are constructed from a fiberglass composite constructed of two fiberglass skins with a polymer concrete core.Adjustable horizontal arm: up to 19-inches.

Distance from floor to sensor bracket: 29-inches. It is used to measure volumetric flow rate in industrial discharges, municipal sewer lines, and influent/.

0.0280 - 1.860 cfs (cubic feet / second) Description: Ultrasonic sensor mounting bracket for Parshall flume data logging ultrasonic flow meter sensors / transducers. The Parshall flume is a fixed hydraulic structure.

The 3-inch Parshall flume is commonly used to measure industrial discharges.

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While the 3-inch Parshall flume is the smallest Parshall flume that should be used on sanitary flows, aluminum is not normally used on such flows. Parshall flumes in accordance with ISO 9826 data sheet are intended for measurement of volumetric flow rate in rectangular channels. Flumes are designed for metering liquids in gravity flow pipelines, open channels and other applications as required. They are of a rigid one piece construction, self supporting. The largest of the small Parshall flumes developed at the Colorado Agricultural Experiment Station, the 3-inch Parshall flume is commonly used to measure water flowing in creeks, furrows, irrigation canals, and channels. Jacobs’ flumes are made of fiberglass reinforced polyester resins laid up over white isophthalic gel-coat.