Flow net is used for the determination of

Question

Question

This question was previously asked in

BPSC AE Paper 6 (Civil) 11 Nov 2022 Official Paper

Answer 1

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:

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.