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Question

Consider the following measuring structures:
1. Submerged broad-crested weir
2. Free broad-crested weir
3. Free sharp-crested weir
4. Free ogee spillway
The correct sequence of the increasing order of the discharge coefficient of these structures is

A
1, 2, 4, 3
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B
2, 1, 3, 4
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C
2, 1, 4, 3
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D
1, 2, 3, 4
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Solution

The correct option is D 1, 2, 3, 4
For ogee spillway Cd1=1.19 Cds
Cds is the discharge coefficient for sharp-crested weir. So 4 will come after 3.
The classification of weir is:

H1/Bw0.1 Long crested weir

01<H1/Bw<0.35 Broadcrested weir

0.35H1/Bw<1.5 Narrowcrested weir

H1/Bw1.5 Sharp-crested weir
Further submerged weirs have lesser coefficient of discharge compared to free weirs. So 2 will come after 1.


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