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What number of major defects does the ogee fall have?

What number of major defects does the ogee fall have? Correct Answer 2

Ogee fall has two major defects. Heavy drawdown occurs on the upstream side, which results in lower depths, higher velocities and bed erosion. The kinetic energy of the flow will not be dissipated due to smooth transition, causing erosion on downstream bed and banks.

Related Questions

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.
Arrange the following stages in a sequence, such that they result in an ogee curve between two parallel lines AB and CD, such that they are the tangents to the arc. m) Join the adjacent ends B and C with a straight line. n) Divide the line BC into four parts using the points P1, P2, P3. o) Draw lines such that they pass through the points P1, P2, P3, and are perpendicular to the line BC. p) Draw the perpendicular lines through the points B and C such that they cut the lines passing through P1, P3 respectively at E and F. q) With the center E draw an arc BP2 and with center F draw an arc P2C, thus arc BP2C is required ogee curve.
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When a ball is allowed to fall, the time it takes to fall any distance varies as the square root of the distance and it takes 4 seconds to fall 78.40 m. How long would it take to fall 122.50 m?
Consider the following statements. I. Possibility of combining some other structure with a fall eg. regulator, road bridge etc. II. Cutting and filling are required below and above the fall should not be necessarily equal. III. The command should not be reduced due to the lowering of F.S.L and the fall may be located below the outlets. Which of the following statement is correct for site selection of a fall?
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