Irrigation Engineering
Presence of tail water in a gravity dam
i) increases the principal stress
ii) decreases the principal stress
iii) increases the shear stress
iv) decreases the shear stress
The correct answer is

(i)and(iv)
(i) and (iii)
(ii) and (iv)
(ii) and (iii)

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Irrigation Engineering
Bligh's theory of seepage assumes

Less weightage to horizontal creep than vertical creep
More weightage to horizontal creep than vertical creep
Loss of head follows the sine curve
Equal weightage to the horizontal and vertical creep

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Irrigation Engineering
Lane's weighted creep theory assumes

Equal weightage to horizontal and vertical creeps
Triple weightage to horizontal creep and one weightage to vertical creep
Double weightage to horizontal creep and one weightage to vertical creep
Triple weightage to vertical creep and one weightage to horizontal creep

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Irrigation Engineering
As per Lacey’s theory, the silt factor is

inversely proportional to average par¬ticle size
not related to average particle size
directly proportional to square root of average particle size
directly proportional to average par¬ticle size

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