Hach Ultrasonic flow sensor Manuel D'utilisation page 11

Figure 4 V notch weir dimension definitions
1 Sensor
2 Maximum depth
3 Tank width B
4 Crest height P
5 Notch angle
6 10-inch deadband
Figure 5 Rectangular weir (with end contractions) dimensions
definitions
1 Sensor
2 Maximum depth
3 Crest width B
4 Channel width B
5 Crest height P
6 10-inch deadband
English 11