Free surface flow rate measurement

A measuring point consists of:

• 1 converter,
• 1-2 level sensors,
• 1-8 speed measurement chords.

The amount and position of the probes depends on:

• the height of the structure,
• the tide range,
• the specific features upstream and downstream of the site in question,
• the required precision.

Ultrasound measurements present several advantages for this type of application:

• reliable process unaffected by the nature of the fluid and its temperature,
• highly dynamic measurements: good results at both low and high water levels,
• takes into account different velocity profiles (up to 8 chords),
• takes into account the entire section of the structure,
• defines the section precisely using 20 points incorporating left and right width/height,
• can be used to take measurements in very wide structures (200 m).