What is a V-notch weir best suited for measuring?

A V-notch weir is particularly effective for measuring small constant flows due to its design and the characteristics of the flow it can accurately gauge. The V-notch shape allows for precise measurement of low flow rates, as it amplifies the effects of small changes in flow depth. This amplification is crucial when dealing with small flows, where the variation might be minimal and difficult to measure with other weir designs.

In applications requiring measurement of larger or more variable flows, other types of weirs, such as sharp-crested or broad-crested weirs, are often more suitable, as they can handle the discharge more efficiently. Therefore, while V-notch weirs can technically measure other flow types, they are not the ideal choice for large variable or medium flows, where inaccuracies may arise. Their design is optimized for a narrow range of low, steady flows, making them an ideal tool for applications like small wastewater treatment operations where precise measurements of flow are essential.