Civil Engineering - UPSC Civil Service Exam Questions - Discussion


Soil at a site consists of two layers. The top layer has permeability k units and bottom layer has permeability 5k units. If the thickness of both the layers is equal, then what is the average permeability in the vertical direction ?

[A]. 3k units
[B]. (5/3)k units
[C]. (6/5)k units
[D]. (5/6)k units

Answer: Option B


No answer description available for this question.

Chandrasekhar Reddy said: (Sep 18, 2017)  

H1 = H, K1 = K
H2 = H, K2 = 5K
Kave = ?
Kave = (H1 + H2)/(H1/K1 +H2/K2)
= (H+H)/(H/K+H/5K)
= 2/(1/K+1/5K)
= 2/(6/5K)

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