V-notch

V-notch weirs are just a thin plate weir with a ‘V’ notch cut into it. The weir is placed to obstruct open channel flow and allow water to flow over the notch. This enables accurate measurement of the flow, by measuring the head upstream of the V notch.

Rectangular weirs and triangular or v-notch weirs are often used in water supply, wastewater and sewage systems. They consist of a sharp-edged plate with a rectangular, triangular or v-notch profile for the water flow. The head over the v-notch Is measured and correlated with flow rate through the open channel