Q. What are the two main causes of failure of hydraulic structure on the pervious foundation?

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Q. The uplift pressure is not important for the upstream apron during considerations of failure due to uplift.

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Q. The structure finally subsides in the hollow formed in the foundation in which failure?

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Q. Heave piping may occur on the _______________

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Q. Backward erosion piping takes place when the phreatic line cuts the downstream face of the dam and seepage pressure is high.

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Q. The safety of a hydraulic structure founded on a pervious foundation can be ensured by:

i. Provision sufficient length of its concrete floor.
ii. Providing sufficient depth of its concrete floor.
iii. Provision a downstream cutoff of some reasonable depth.

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Q. What is the value of Bligh’s coefficient for coarse-grained soil?

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Q. For sand mixed with boulder and gravel and for loam soil, the safe hydraulic gradient should be ___________

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Q. Which of the following is not a limitation of creep theory?

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Q. If the value of Bligh’s coefficient for a particular soil is equal to 12 then, what is the safe hydraulic gradient for that soil?

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Q. According to Bligh, a vertical cut-off at U/s end of the floor is less useful than the one at the D/s end of the floor.

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Q. Consider the following statements about Bligh’s Creep Theory.

i. Creep length is the length of path traversed by percolating water

ii. To increase the path of percolation vertical cut-off or sheet piles can be provided

iii. Loss of head per unit creep length is hydraulic gradient

iv. Bligh gave no criteria for the safety of weir against undermining

Which of the following statements are correct?

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Q. As per Bligh’s theory, thickness to be provided by taking a factor of safety equal to _______

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Q. Lane’s in his theory proposed that horizontal creep is more effective than the vertical creep.

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Q. In Lane’s weighted creep theory, he suggested a weightage factor _________

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Q. Which of the following limitation of Bligh’s theory forms the basis of Lane’s creep theory?

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Q. What is the value of Lane’s coefficient for fine sand and coarse sand?

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Q. What is the range of Lane’s coefficient for clayey soils?

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Q. The laplacian equation represents two sets of curves intersecting orthogonally.

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Q. What is the path represented by the streamlines?

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