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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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+1 vote
in Irrigation Engineering by (75.2k points)
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?

(a) 1/12

(b) 1/9

(c) 1/15

(d) 1/5

The question was asked in an interview for internship.

This intriguing question comes from Seepage Theories in section Seepage Theories and Weirs and Barrages Design of Irrigation Engineering

1 Answer

0 votes
by (106k points)
Right choice is (a) 1/12

Easiest explanation: The hydraulic gradient i.e. HL/L is equal to the coefficient of creep 1/C.

Bligh’s coefficient = 12

So, safe hydraulic gradient = 1/12.

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