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A weir is said to be narrow-crested, if the width of the crest of the weir is Where H = height of water above weir crest

A weir is said to be narrow-crested, if the width of the crest of the weir is Where H = height of water above weir crest Correct Answer less than H

Explanation:

Classification of weir based on shape of crest:

1. Sharp crested weir: 

The crest shape of the weir is very sharp. It is most widely used weir.

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2. Broad-crested weir: 

These are constructed only in a rectangular shape and are suitable for the larger flows.

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3. Narrow-crested weir: 

It is similar to a rectangular weir with a narrow-shaped crest at the top. The discharge over the narrow crested weir is similar to the discharge over the rectangular weir.

If 2b is less than H, the weir is called a narrow-crested weir.

Where b = Width of the crest of the weir and H = Height of water above the weir crest

4. Ogee-shaped weir: 

Generally ogee shaped weirs are provided for the spillway of a storage dam. The crest of the ogee weir is slightly risen and falls into parabolic form.

 

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