What type of weir is a Cipolletti weir?

A Cipolletti weir is specifically designed with a trapezoidal shape, which allows for more accurate measurement of flow rates compared to a rectangular weir. The sides of the Cipolletti weir slope outward at a 1:4 ratio, meaning for every 1 unit of height, the width increases by 4 units. This unique geometry helps minimize the effects of turbulence and provides a more consistent relationship between the flow rate and the water level over the weir.

Maintaining this specific trapezoidal shape is crucial for achieving the precise hydraulic performance that is expected from a Cipolletti weir. It is especially useful in applications requiring reliable flow measurement, such as in irrigation systems and water management facilities. The design facilitates a lower energy loss as fluid passes over the weir, making it an effective solution for measuring water flow in various settings.