C4-MKII – Multi-Purpose Teaching Flume


C4-MKII – Multi-Purpose Teaching Flume

The Armfield Multi-purpose Teaching Flume has been specifically designed to demonstrate the principles of fluid mechanics when applied to engineering structures in open channel flow.


The Armfield Multi-purpose Teaching Flume has been specifically designed to demonstrate the principles of fluid mechanics when applied to engineering structures in open channel flow.

The MkII version is supplied as an accessory to the F1-10 Hydraulics Bench, and can be used with any recently supplied F1-10.

The C4MkII is a small open channel flume, available in 2.5m or 5.0m lengths, with clear acrylic sides to the working section for complete visibility of the flow.

The channel is fitted with a PVC inlet tank, and is designed for free discharge into the Hydraulics Bench. The flume is mounted on a rigid framework, and can be tilted by use of a calibrated screwjack, which enables accurate slope adjustment of the channel.

The inlet tank incorporates a stilling arrangement to diffuse the water flow prior to entry into the channel, ensuring smooth uniform flow. The level in the working section of the flume is controlled using an overshot weir (stop logs) at the discharge end.

Bed-pressure tappings and fixing points for models are provided.

A longitudinal scale positioned at the top of the channel enables depth gauges and pitot static tubes to be accurately positioned along the channel length.

The flume is designed for use with a standard Armfield F1-10 Hydraulics Bench, which provides the pumped water flow, the flow control valve and a volumetric tank for flow measurement.

Also available is an optional flow meter, which can be fitted to the C4-MkII to enable direct flow measurements to be taken.

Optional educational software is available (C4-MKII-ABASIC) offering a complete teaching package of coursework. The student manually enters data in the software, which can then be used for calculations, data processing and graph plotting.

Requires Hydraulics Bench Service unit F1-10
Armfield C4MKII Venturi Flume (supplied)


Armfield C4MKII Adjustable Undershot Weir (supplied)


Armfield C4MKII Broad Crested Weir


Armfield C4MKII Crump Weir


Armfield C4MKII Sharp Crested Weir (supplied) shown in unvented condition

Technical Specifications

Models and gauges supplied

Venturi flume
Sharp and broad-crested weirs
Crump weir
Adjustable undershot weir
Two Vernier level gauges (Hook and point gauges)

Channel dimensions

Width  76mm
Height  250mm
Channel Slope  Adjustable between -1% and +3%

Features & Benefits


  • Use of hook and point gauges to measure water level
  • Use of a pitot static tube to measure flow rate (using optional C4-61)
  • Learning how to apply force-momentum and steady-flow energy equations to simple flow situations
  • Understanding the relationship between water level above the crest of a weir and flow rate over the weir
  • Using hydraulic structures to control level, eg syphon spillways
  • Understanding sub and super-critical flow and the underlying characteristics of standing waves
  • Hydraulic jump
  • Using hydraulic structures for control of flow, eg sluice gate
  • Applying and understanding Manning’s formula
  • Measurement of velocity profiles (using optional C4-61)
  • Waves (using optional C4-67)

Armfield C4-61 Hook & Point Guage with J Needle
Armfield C4 -62 Culvert fitting


Armfield_C4-63_FlowSplitters X3
Armfield C4-64 Free overflow spillways


Armfield C4-65 Air-regulated syphon
Armfield C4-65 Syphon Spillway


C44-66 Model Radial Gate


Armfield C4-67 Wave generator


Armfield C4-68 Flume-False Floor


Armfield C4-69 Artificially Roughened Bed

  • A 76mm wide, 250mm high open channel for use with an F1-10 Hydraulics Bench
  • Available in 2.5m and 5.0m working section lengths
  • Clear acrylic sides to give visibility of the working section
  • A jacking system permits the slope of the channel bed to be adjusted between -1% and +3%
  • Inlet tank with flow stilling arrangement
  • Includes a Venturi, sharp and broad-crested weirs, 2 vernier level gauges, adjustable undershot weir and crump weir
  • Wide range of other models available as accessories.
  • Optional flow meter
  • Comprehensive instruction manual

  • Electrical supply: The F1-10 requires an electrical supply, please refer to the F1 data sheet for details.

– F1-10-A: 220-240V / 1ph / 50Hz / 10A
– F1-10-B: 110-120V / 1ph / 60Hz / 10A
– F1-10-G: 220V / 1ph / 60Hz / 10A
– F1-10-2-A: 220-240V / 1ph / 50Hz / 10A
– F1-10-2-B: 110-120V / 1ph / 60Hz / 10A
– F1-10-2-G: 220V / 1ph / 60Hz / 10A



Volume: 2.8m³

Gross Weight: 330Kg


Volume: 3.0m³

Gross Weight: 350Kg


Length: 2.91m

Width: 0.62m

Height: 1.46m


Length: 5.41m

Width: 0.62m

Height: 1.46m


Multi-purpose Flume, 2.5m, with basic accessories


Multi-purpose Flume, 5m, with basic accessories


Multi-purpose Flume, 2.5m, with basic accessories and flow meter


Multi-purpose Flume, 5m, with basic accessories and flow meter


Educational Software

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