There are different types of warts. It can be a simple metal plate with a V-notch cut into it, or it can be a concrete and steel structure on a river bed. A wire causing a large change in water level will give an accurate indication of flow rate compared to the error inherent in the depth measurement method.Sharp crested weir
Broad crested weir (or broad-crested weir)
Crump weir (named after the designer)
Needle dam
Proportional weir
Combination weir
MF weir
V-notch weir
Rectangular weir
Cipolletti (trapezoidal) weir
Labyrinth weir
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