A tank and set of notch wiers for the study of fl ow regulation and measurement devices
Key Features
• Portable, corrosion-resistant glass-fi bre channel for ease of use and long life
• Includes one rectangular and two V-shaped notches for basic experiments
• Two additional weirs included for more advanced experiments
• Adjustable depth gauge for precise measurement of water level
• Works with TecQuipment’s Hydraulic Bench for easy installation
Learning Outcomes
Comprehensive study of fl ow over weirs, including:
• Investigation of head against discharge
• Coeffi cient of discharge
• Rectangular and diff erent angled V-notches
Key Specifications
• Three basic weirs: Rectangular, 30° and 90° V-notch
• Two advanced weirs: Cipoletti and linear head/fl ow
• Depth gauge
Description
The Discharge over a Notch apparatus shows clearly the use of weirs as simple fl ow regulators. It works with and fi ts on the top of TecQuipment’s Digital Hydraulic Bench (H1F, available separately)*.
It allows students to do tests on relationships between upstream water level and weir discharge for diff erent shaped notches. They can then compare their results with theory.
The equipment is a moulded tank, the middle section of which forms a channel. One end of the tank is wide; the other end is deeper than the rest of the tank. Each weir fi ts in a sealed groove in the channel section. Plastic materials and corrosion-resistant fi nishes protect against corrosion.
The hydraulic bench supplies water to the wide end of the tank. Water fl ows through the channel and over the weir, where the deep tank exit allows students to see the discharge. Students measure the free water surface using an adjustable depth gauge attached to a beam across the channel. Water exits the tank, back into the hydraulic bench.
The equipment includes a basic set of three weirs including two diff erent V-notch weirs and a rectangular notch weir. It also includes an advanced set of two weirs including a Cipoletti (trapezoidal) weir and a linear head/ fl ow weir.
To do experiments, students regulate the fl ow using the hydraulic bench. They note the value of discharge and head, and reduce the fl ow. They repeat the readings for equal decrements in head, until the stream no longer springs clear of the notch.
Essential Base Unit
• Digital Hydraulic Bench (H1F)*
*This product will also work with an existing TecQuipment Gravimetric Hydraulic Bench (H1)
