Armfield Engineering Education
IRRIGATION WATER MANAGEMENT
FEX26-1-11 Flumes and Gauging Weirs - Issue (Provisional)
A series of flumes and weirs for the measurement of water flow
rates in open channels.
Components are manufactured from tough durable materials yet can be easily
handled during installation.
ORDERING SPECIFICATION
FEX26-1/2/3 PARSHALL FLUMES
Parshall flumes constructed in GRP, supplied with measuring scales, spirit levels and calibration curves.
FEX26-4/5/6 WSC FLUMES
WSC flumes constructed in GRP and fitted with depth measuring scale supplied wih calibration curve.
FEX26-7 THIN PLATE WEIRS AND ACCESSORIES
Thin plate weirs constructed of stainless steel and mounted on a painted weir plate carrier with a simple head scale attached.
FEX26-8 STILLING WELL WITH DEPTH GAUGE
Stilling well with depth gauge comprising hook and point gauge.
FEX26-9 CHANNEL SECTION
FEX26-9:
Lightweight portable channel section constructed of corrosion resistant
material.
FEX26-10 BROAD-CRESTED WEIR
FEX26-10:
Broad crested weir constructed of durable glass reinforced plastic.
FEX26-11 CRUMP WEIR
FEX26-11:
Triangular shaped broad crested Crump weir constructed of durable glass
reinforced plastic.
Features
All flumes and weirs have the following features:
> low cost
> highly portable
> extremely durable
Description
FEX26-1/2/3 PARSHALL FLUMES
Named after the inventor, this widely used flume causes little head loss and passes sediment readily. Constructed in GRP, flumes are supplied with measuring scales, spirit levels and calibration curves.
FEX26-4/5/6 WSC FLUMES
This trapezoidal design of flume, developed by Washington State College (WSC) for field irrigation, has the advantages over the rectangular flume of giving a greater depth range, of conforming more closely to the channel section and of allowing sediment to pass more freely. Constructed in GRP, these flumes are fitted with a depth measuring scale supplied with calibration curve.
FEX26-7 THIN PLATE WEIRS AND ACCESSORIES
Armfield thin plate weirs are constructed of stainless steel and mounted on a painted weir plate carrier which can set either into the banks and bed of a small stream or fixed to the end of a concrete channel, A simple head scale is attached to each weir plate but a stilling well can be fitted for greater accuracy.
The following weir plates are suplied:
rectangular weir, Cipoletti weir, 90° v-notch weir, ½ 90° v-notch weir.
FEX26-8 STILLING WELL WITH DEPTH GAUGE
Depth gauge comprises 300mm hook and point gauge, resolution 0.1mm.
FEX26-9 CHANNEL SECTION
A lightweight channel section made from corrosion resistant material with the provision for easy mounting of the FEX26-10/11
FEX26-10 BROAD-CRESTED WEIR
Used for controlling upstream water levels and measuring discharge rate. The weir is set perpendicular to the flow across the channel bed. It is particularly useful in sedi-ment laden waters that can be detrimental to sharp edged weirs. Made from durable glass reinforced plastic.
FEX26-11 CRUMP WEIR
Named after its designer, C S Crump, this broad-crested weir is triangular in section making it less likely to trap silt and debris. The weir is used for accurate measurement of discharge rates. Made from durable glass reinforced plastic.
Technical details
FEX26-1: Parshall flume 25mm throat for flows 0.3 to 5 litres/sec
FEX26-2: Parshall flume 51mm throat for flows 0.5 to 14 litres/sec
FEX26-3: Parshall flume 152mm throat for flows 1.5 to 110 litres/sec
FEX26-4: WSC flume for flows 0.1 to 2.0 litres/sec
FEX26-5: WSC flume for flows 1.0 to 7.5 litres/sec
FEX26-6: WSC flume for flows 6.0 to 76 litres/sec
FEX26-7:-
> rectangular weir: max flow rate of 28 litres/sec
> Cipoletti weir: a trapezoidal shaped weir with a max flow rate of 28
litres/sec
> 90° v-notch weir: max flow rate of 15 litres/sec
> 1 /2 90° v-notch weir: max flow rate of 7.5 litres/sec
FEX26-8:no data available
FEX26-9:no data available
FEX26-10: flow range: 0-30 L/sec
FEX26-11: flow range: 0-30 L/sec
Shipping specification
FEX26-1/2/3 PARSHALL FLUMES
FEX26-1:
Volume: 0.01m3
Gross weight: 40kg
FEX26-2:
Volume: 0.20m3
Gross weight: 50kg
FEX26-3:
Volume: 0.40m3
Gross weight: 60kg
FEX26-4/5/6 WSC FLUMES
FEX26-4:
Volume: 0.01m3
Gross weight: 40kg
FEX26-5:
Volume: 0.20m3
Gross weight: 50kg
FEX26-6:
Volume: 0.75m3
Gross weight: 60kg
FEX26-7 THIN PLATE WEIRS AND ACCESSORIES
Volume: 0.20m3
Gross weight: 100kg
FEX26-8 STILLING WELL WITH DEPTH GAUGE
Volume: 0.30m3
Gross weight: 50kg
FEX26-9 CHANNEL SECTION
FEX26-9:
Volume: 0.60m3
Gross weight: 70kg
FEX26-10:
Volume: 0.10m3
Gross weight: 30kg
FEX26-11:
Volume: 0.10m3
Gross weight: 30kg
FEX26-10 BROAD-CRESTED WEIR
FEX26-10:
Volume: 0.10m3
Gross weight: 30kg
FEX26-11 CRUMP WEIR
FEX26-11:
Volume: 0.10m3
Gross weight: 30kg
Overall dimensions
FEX26-1/2/3 PARSHALL FLUMES
FEX26-1:
Height: 270mm
Width: 360mm
Depth: 710mm
FEX26-2:
Height: 305mm
Width: 420mm
Depth: 860mm
FEX26-3:
Height: 756mm
Width: 902mm
Depth: 1830mm
FEX26-4/5/6 WSC FLUMES
FEX26-4:
Height: 175mm
Width: 250mm
Depth: 500mm
FEX26-5:
Height: 230mm
Width: 350mm
Depth: 780mm
FEX26-6:
Height: 420mm
Width: 707mm
Depth: 1057mm
FEX26-7 THIN PLATE WEIRS AND ACCESSORIES
no data available
FEX26-8 STILLING WELL WITH DEPTH GAUGE
no data available
FEX26-9 CHANNEL SECTION
FEX26-9:
Height: 525mm
Width: 600mm
Depth: 2000mm
FEX26-10 BROAD-CRESTED WEIR
FEX26-10:
Height: 120mm
Width: 450mm
Depth: 400mm
FEX26-11 CRUMP WEIR
FEX26-11:
Height: 70mm
Width: 450mm
Depth: 450mm
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