Flow net is used for the determination of 

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BPSC AE Paper 6 (Civil) 11 Nov 2022 Official Paper
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  1. quantity of seepage
  2. hydrostatic pressure
  3. exit gradient
  4. All of the above

Answer (Detailed Solution Below)

Option 4 : All of the above
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Flow Nets:

It is a graphical solution to the Laplace equation for two-dimensional seepage flow. Two orthogonal sets of curves forming a flow net are:

  • Equi potential lines → connecting points of the equal total head
  • Flow lines → indicating the direction of seepage down under a hydraulic gradient.

In the case of isotropic soil, these lines are orthogonal to each other but need not be orthogonal in anisotropic soil.

Application of flow net is as follows:

  1. Determination of seepage
  2. Determination of hydrostatic pressure
  3. Determination of seepage pressure
  4. Determination of exit gradient

Important Points

Various methods of obtaining flow nets are:

1) Graphical method

2) Electrical Analogy method

3) Soil Model

4) Plastic Model

5) Solution of Laplace equation/Analytical method.

Sand model is not used to obtain flow nets.

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