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If the operating head on an ogee spillway is more than the design head then ________________

If the operating head on an ogee spillway is more than the design head then ________________ Correct Answer the pressure on the crest will be negative causing cavitation

The lower nappe of the falling jet may leave the ogee profile when the operating head of the spillway is more than the design head. This generates negative pressure at the point of separation which leads to the formation of cavities in the water resulting in cavitation.

Related Questions

An ogee spillway of a concrete gravity dam having FRL of 328 m and MWL of 340 m is provided with vertical gates between piers erected on the spillway. The effective length of the spillway is 60 m. The discharge through the spillway when gates are opened up to the actual reservoir level of 331.0 m will be_____________
The discharge passing over an ogee spillway is given by (where, L is effective length of spillway crest and H is the total head over the spillway crest including velocity head.)
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.
The suction pressure on an ogee spillway is caused when the head on the spillway is:
When the gated sluices are provided through the body of the dam spillway then the ogee spillway structure shall normally be of Corbel type.
The W.E.S downstream profile of an ogee spillway can be represented by an equation: Xn = K Hd n-1. Y Where x and y are the coordinates of the points on the crest profile and K and n for a vertical upstream spillway would respectively be___________________
In the functioning of an ogee spillway, the operating head ______________________
If the head of the water over the spillway is less than the design head, then ________________
The downstream apron of the ogee spillway is found to have a negligible effect on the coefficient of discharge when the value of ________________
P, Q, R, Sand T are five crops that Babu grows. T is fast growing and more water demanding than R which gives more yield than T. P gives more yield than R and grows faster than Q. Q is more water demanding than T but is second lowest yielder, S is the slowest growing and least water demanding of all crops but gives highest yield. R is more water demanding and grows faster than P. Select the crop or crops that has/ have as many as crops that are more water demanding and as many as crops that give less yield than it.