Methods of construction of flow net

Flow net construction methods include Analytical methods, Electrical analogy method, Capillary flow model, Sand model and Graphical methods

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What is flow net?

Flow net represents the flow of water through a soil graphically. In field, under sheet piles, under dams and under masonry structures flow is not 1D, it may be 2D/3D

What are the methods of construction of Flow net?

• Analytical methods
• Electrical analogy method
• Capillary flow model
• Sand model
• Graphical method

Analytical and Electrical Analogy methods

In analytical method - the solution of laplace equation is found out using the mathematical equations, it would be possible for simple problems.

Electrical analogy method

• It uses the similarity between the Darcy’s law and Ohm’s law
• Through the water medium salt is added and current is allowed to pass, based on the current flow pattern, flow net is constructed

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Capillary flow model

Model of earth dam is placed between two glass plates and a head of water would be maintained on both sides.

• So water is allowed to flow and some dye is added to water and the path followed by the dye is observed.
• Based on that the flownet would be constructed

What are the methods of construction of Flow net?

A sheet pile is inserted between the upstream and downstream flow.

• The path followed by the water along the sheet pile creates a flow line.
• Impervious boundary creates another flow line.
• Bottom of the upstream and downstream water level would be two equipotential lines.
• Using these 4 boundary conditions a flownet would be constructed

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