sharp-crested weir

Weir plates for sharp-crested weirs should be constructed of stainless steel.

This paper investigates sharp-crested weirs having different cross-sectional geometry and their effect on the air entrainment rate.

Only sharp-crested weirs are described here because they are normally the only type used in the measurement of irrigation water.

Weir plates for sharp-crested weirs should be a minimum of 6 mm thick with a 45o downstream chamfered edge.

Flumes offer distinct advantages over sharp-crested weirs:

It is demonstrated that the air entrainment rate of a 30° triangular sharp-crested weir is better than that of the other sharp-crested weirs tested.

Water level-discharge relationships can be applied and meet accuracy requirements for sharp-crested weirs if the installation is designed and installed consistent with established ASTM and ISO standards.

Moreover, variation in the number of V-notches over the width of the weir plate was studied for 30° triangular sharp-crested weirs. The 30° triangular sharp-crested weir with two V-notches was found to have higher values of air entrainment rate.