A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.

A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

A

Equal to

B

Less than

C

More than

D

None of these

Consider the following measuring structures. A. Submerged broad-crested weir B. Free broad-crested weir C. Free sharp-crested weir D. Free ogee spillway Which is the correct sequence of the discharge coefficient of these structures in increasing order?

A

B, A, C, D

B

B, A, D, C

C

A, B, D, C

D

A, B, C, D

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

equal to H

B

more than H

C

less than H

D

None of the above

The discharge over a rectangular weir, considering the velocity of approach, is (where H₁ = H + H_a)
(H₁ = Total height of water above the weir, H = Height of water over the crest of the weir and H_a = Height of water due to velocity of approach)

A

$$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{L}}\sqrt {2{\text{g}}} \left$$

B

$$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{L}}\sqrt {2{\text{g}}} \left$$

C

$$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{L}}\sqrt {2{\text{g}}} \left$$

D

$$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{L}}\sqrt {2{\text{g}}} \left$$

In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir.

A

Equal to

B

One-third

C

Two-third

D

Three-fourth

Statement (I): The ogee spillway is a control weir having an S-shaped crest profile which provides a high discharge coefficient without causing cavitations. Statement (II): The crest profile of ogee spillway conforms to the lower nappe of flow over a ventilated sharp-crested weir and ensures a constant discharge coefficient for all heads.

A

Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

B

Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

C

Statement (I) is true but Statement (II) is false

D

Statement (I) is false but Statement (II) is true (II) is true:

P. A weir is a hydraulic structure where majority or the entire ponding is achieved by a raised crest and smaller part or nil part by the shutters. Q. A weir is a hydraulic structure that is made by constructing the width of the channel only. R. A barrage is a hydraulic structure that is made by creating a choking condition only. S. A barrage is a hydraulic structure where majority or the entire ponding is achieved by a shutter and smaller part or nil part by the raised crest. Identify the correct statements in the above.

A

P and R

B

Q and S

C

Q and R

D

P and S

When the crest of an ogee spillway is designed to be in accordance with the lower nappe of a free-falling water jet over a duly ventilated sharp-crested weir then theoretically

A

The pressure on the spillway crest will be zero at design head only

B

The pressure on the spillway crest will always be zero

C

The pressure on the spillway crest will always be negative

D

The pressure on the spillway crest will be always positive

As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at

A

lower level

B

higher level

C

same level

D

any of the above depending on the design

Consider the following statements with respect to weir under discussion: 1. Its design corresponds to soft sandy foundation. 2. The difference in weir crest and downstream river bed may not exceed 3. When water passes over it, the longitudinal location of the formation of a hydraulic jump is variable. This weir is of the type

A

Vertical drop weir

B

Masonry or concrete sloping weir

C

Dry stone slope weir

D

Parabolic weir

A weir is said to be broad crested weir, if the width of the crest of the weir is ________ half the height of water above the weir crest.

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