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The crest profile of an ungated ogee spillway, downstream of the apex under a design head Hd, can be expressed as (y/Hd) = K(x/Hd)n Where the coefficients K and n, for a vertical upstream spillway would, respectively, be 
  • a)
    0.5 and 1.85
  • b)
    0.85 and 2.0
  • c)
    2.0 and 0.85
  • d)
    2.0 and 1.5
Correct answer is option 'A'. Can you explain this answer?
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The crest profile of an ungated ogee spillway, downstream of the apex ...
Crest profile of an ungated ogee spillway:

The crest profile of an ungated ogee spillway, downstream of the apex under a design head Hd, can be expressed as (y/Hd) = K(x/Hd)n

Coefficients K and n:

The coefficients K and n depend on the shape of the spillway. For a vertical upstream spillway, the coefficients would be:

K = 0.5

n = 1.85

Explanation:

The coefficient K is a measure of the curvature of the spillway. For a vertical upstream spillway, the curvature is moderate, so K is 0.5.

The coefficient n is a measure of the steepness of the spillway. For a vertical upstream spillway, the steepness is high, so n is 1.85.

Therefore, the correct answer is option A, which states that for a vertical upstream spillway, the coefficients K and n would be 0.5 and 1.85, respectively.
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The crest profile of an ungated ogee spillway, downstream of the apex under a design head Hd, can be expressed as (y/Hd) = K(x/Hd)n Where the coefficients K and n, for a vertical upstream spillway would, respectively, bea)0.5 and 1.85b)0.85 and 2.0c)2.0 and 0.85d)2.0 and 1.5Correct answer is option 'A'. Can you explain this answer?
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