The V-Notch (triangular) Weirs are typically installed in open channels such as streams to determine discharge (flow rate).
The V-Notch Weir System is used to measure water flow volume. It is used predominately in dams, open channels such as streams and in tunnels.
The system comprises a Stainless Steel plate with a notch profile chosen to suit predicted flow rates.
Flow of water over the weir head can be measured optically with a manual steel scale, or by using a Vibrating Wire transducer.
Readings can be taken manually with a Vibrating Wire readout or remotely by means of a data acquisition system.
The Vibrating Wire V-Notch Weir system has three notch options to suit different water flows and a choice of using manual or remote monitoring.
Manual reading has two options:
When using remote reading, the Vibrating Wire transducer is connected to a data acquisition system. Once the user has chosen which notch option is most suitable for a specific project, the weir plate is mounted at the exit of an approach channel or stilling basin through which the flow to be measured is channelled.
The measuring point for the head of water is located upstream of the weir plate and comprises either an optical Stainless Steel scale fixed to the basin wall for manual readings by eye, or a Vibrating Wire transducer suspended in the head of water.
The Vibrating Wire V-Notch Weir system uses the principle of gravitational discharge of water over a triangular or rectangular notched weir plate.