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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.

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Applied Fluid Mechanics
C4MKII Multi-Purpose Teaching Flume - Issue 2 

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

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Ordering Specification

  • 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

Experimental Capabilities

  • Study of open channel flume
  • Use of hook and point gauges to measure water level
  • Use of a Pitot-static tube to measure flowrate and velocity profiles (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 waves
  • Hydraulic jump
  • Using hydraulic structures for control of flow eg sluice gate
  • Applying and understanding Manning's formula


The C4Mkll is a small open channel flume, available in 2.Sm or 5.0m lengths, with clear acrylic sides to the working section for total 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 allows 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 at the discharge end.

Bed pressure tappings and fixing points for models are provided. A longitudinal scale positioned at the top of the channel allows 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 flowmeter which can be fitted to the C4-Mkll to allow direct flow measurements to be taken.


Optional educational software is available (C4-Mkll-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.

Technical Details

Channel dimensions:
Width: 76mm
Height: 250mm
Channel slope: Adjustable between -1% and +3%

Models and gauges supplied:

  • Venturi flume
  • Sharp and broad-crested weirs
  • Crump weir
  • Adjustable undershot weir
  • 2 vernier level gauges


Optional models available:
C4-61: Pitot tube and manometer
C4-62: Culvert fitting, one edge square, one rounded
C4-63: Flow splitters; central wall with various nose pieces
C4-64: Free overflow spillway section complete with ski jump sloping apron and blended reverse curvature attachments
C4-65: Syphon spillway and air-regulated syphon
C4-66: Model radial gate
C4-67: Wave generator and wave-absorbing beach
C4-68: False floor sections for gradually varied profiles
C4-69: Artificially roughened bed 2.5m long section (two required for a 5m flume)

Ordering Details

C4-MkII-2.5-10 Multi-purpose Flume, 2.5m, with basic accessories
C4-MkII-5.0-10 Multi-purpose Flume, 5m, with basic accessories
C4-MkII-2.5-11 Multi-purpose Flume, 2.5m, with basic accessories and flowmeter
C4-MkII-5.0-11 Multi-purpose Flume, 5m, with basic accessories and flowmeter
C4-MkII-ABASIC Educational Software

Essential Accessories

Armfield F1-10 Hydraulics Bench

Shipping Specification

  C4-MkII-2.5 C4-MkII-5.0
Gross weight: 330kg 380kg
Volume: 2.8m3 3.0m3

Overall Dimensions

  C4-MkII-2.5 C4-MkII-5.0
Length: 2.91m 5.41m
Width: 0.62m 0.62m
Height: 1.46m 1.46m