Civil Engineering - UPSC Civil Service Exam Questions - Discussion


A flownet for an earth dam on impervious foundation consists of 4 flow channels and 15 equipotential drops. The full reservoir level is 15 m above the downstream horizontal filter. Given that horizontal permeability is 9 x 10-6 m/s and vertical permeability is 1 x 10-6 m/s, the quantity of seepage through the dam will be

[A]. 36 ml/s/m
[B]. 25 ml/s/m
[C]. 20 ml/s/m
[D]. 15 ml/s/m

Answer: Option A


No answer description available for this question.

Umesh Jit said: (Sep 17, 2018)  
Q = KH (Nf/ND).
K= √(Ky /Kx).

Harish said: (Oct 29, 2018)  
Equivalent permeability.

ke =sq root ( kx * ky) =3 * 10^6 m/s.

Seepage q= ke x H x Nf/Nd.
= 12 x 10-6m3/s/m.

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