Parshall flumes are hydraulic measurement elements used for flow measurement and flow control in open channel flows. They enable high accuracy and continuous measurement of water flow in wastewater treatment plants, channel lines or surface water inlets. The flume consists of a channel structure that narrows at certain geometric ratios. This geometry increases the speed of water, creating a hydraulic jump (venturi effect), and the amount of flow passing through the water level can be calculated with standard calibration curves. Parshall flumes produced by our company are manufactured from stainless steel (AISI 304 / 316) and HDPE (PE100) materials and meet the highest quality standards in terms of both durability and longevity.
The Parshall flume consists of three sections: inlet (convergent), throat and outlet (divergent). As water flows through this narrowing-transition structure, the speed increases in the throat section and the water level drops. This velocity-level change forms the basis of flow calculation. An ultrasonic level sensor or pressure sensor placed on the flume continuously measures the water height (Hₐ). This level value is proportional to the calibration curves (Q = K × Hⁿ) defined according to the Parshall flume standard. In this way, the system can calculate the instantaneous or total flow (m³/hour, m³/day) value. If desired, the flume can work integrated with an automatic flow measurement panel and data logger.
High chemical resistance, rigid and long-lasting structure
Preferred in outdoor environments, industrial lines and aggressive environments
Welded and bolted mounting options available
Lightweight, corrosion-free and maintenance-free structure
Easily integrated into reinforced concrete channels or polyethylene lines
Leak-proof connection is made with ultrasonic welding or thermofusion
Parshall flumes are produced in different throat widths according to flow range. All sizes comply with ISO 9826 / ASTM D1941 standards.
| Size | Throat Width | Flow Range | Length | Height |
|---|---|---|---|---|
| 1" | 25 mm | 0.0005 – 0.003 m³/s | 450 mm | 150 mm |
| 3" | 75 mm | 0.002 – 0.020 m³/s | 600 mm | 200 mm |
| 6" | 150 mm | 0.010 – 0.100 m³/s | 900 mm | 300 mm |
| 9" | 225 mm | 0.030 – 0.250 m³/s | 1100 mm | 400 mm |
| 12" | 300 mm | 0.060 – 0.400 m³/s | 1300 mm | 500 mm |
| 18" | 450 mm | 0.150 – 1.000 m³/s | 1600 mm | 700 mm |
| 24" | 600 mm | 0.250 – 2.000 m³/s | 1900 mm | 900 mm |
Three-part modular structure (inlet – throat – outlet)
Smooth transitions and laser cutting tolerances on inner surfaces
Flanged or anchored connection points
Special sensor platform or bracket for level measurement
Optional inlet screen and sediment discharge valve
Anchored mounting inside reinforced concrete channel
Welded (butt-fusion) connection inside HDPE line
Flanged type module as portable measurement point
±2% measurement precision (with calibrated sensor)
Contains no moving parts
Long life thanks to stainless or HDPE body
Lightweight, compact and field-compatible structure
SCADA connection with ultrasonic or pressure sensor
Long-term stable measurement without requiring calibration
Low investment cost in open channel flow measurement
All sizes from 1"–48" can be produced from stock
Municipal wastewater treatment plants (inlet and outlet flow measurement)
Industrial treatment lines and process water systems
Regulation stations, surface water channels
Irrigation water and drainage lines
Laboratory and pilot scale treatment systems
Flowmeter calibration channels
Continuous monitoring systems at discharge points according to SKKY and ISO 5667
Parshall flumes can be used together with ultrasonic level meters, pressure sensors or radar sensors. Sensor data is transferred to the control panel or SCADA system; instantaneous flow (Q), total flow (ΣQ) and level (H) values can be monitored on the software. If desired, the system can be equipped with remote monitoring and automatic reporting features with a data logger or GSM modem.
Parshall flumes are standard hydraulic equipment that enable reliable, economical and long-lasting measurement of open channel flows. Models produced by our company fully meet the needs of modern facilities with stainless steel and HDPE material options, precise manufacturing tolerances and automation compatibility. Thanks to their corrosion-resistant structures, easy installation features and high measurement precision; our Parshall flumes are used as the most reliable solution for accurate flow measurement in municipal and industrial facilities.