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Frequently Asked Questions

What is the shape of a Cipolletti Weir?

A standard Cipolletti weir is trapezoidal in shape (Fig. 1). The crest and sides of the weir plate are placed far enough from the bottom and sides of the approach channel to produce full contraction. The sides incline outwardly at a slope of 1 horizontal to 4 vertical.

What units should I use to calculate Cipoletti weir side slopes?

Our calculation allows you to work in a variety of units. Note that L is measured along the bottom of the weir (called the crest), not along the water surface. Cipoletti weir side slopes should have a vertical to horizontal ratio of 4 to 1. Head (h) should be measured at a distance of at least 4h upstream of the weir.

What is the accuracy of Cipoletti weirs?

The accuracy of measurements obtained by use of Cipoletti weirs and the above equation is considerably less than that obtainable with suppressed rectangular or V-notch weirs (Shen, 1959). The accuracy of the discharge coefficient is + 5 percent.

Is a Cipoletti Weir contracted or suppressed?

(a) Equation for Cipoletti Weirs The Cipoletti weir is a contracted weir. However, its discharge calibration resembles that of a suppressed weir because the effects of side contractions are intentionally compensated for by sloping the sides of the weir plate outward.

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