GATE Civil Engineering
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A flownet below a dam consists of $24$ equipotential drops and $7$ flow channels. The difference between the upstream the upstream and downstream water levels is $6$ m. The length of the flow line adjacent to the toe of the dam at exit is $1$ m. The specific gravity and void ratio of the soil below the dam are $2.70$ and $0.70$, respectively. The factor of safety against piping is

  1. $1.67$
  2. $2.5$
  3. $3.4$
  4. $4$
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