# What is Flow Net in geotechnical engineering?

Asked By: Roya Jacquelin | Last Updated: 10th June, 2020
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Flow Net – Properties and Applications. A Flow net is a graphical representation of flow of water through a soil mass. It is a curvilinear net formed by the combination of flow lines and equipotential lines. Flow lines represent the path of flow along which the water will seep through the soil.

Keeping this in consideration, what is meant by flow net?

A flownet is a graphical representation of two-dimensional steady-state groundwater flow through aquifers. Construction of a flownet is often used for solving groundwater flow problems where the geometry makes analytical solutions impractical.

Subsequently, question is, what is quick sand condition? Quick sand condition or boiling Quick sand condition is a condition of flow, not a type of soil, in which a vertical upward seepage flow causes floating condition of a particle in cohesion less soil such as Sand and fine gravel . ? There is also a pressure in downward direction due to submerged weight of soil.

In this regard, what are the properties of flow net?

Properties of Flow net: Flow nets must satisfy the boundary conditions of flow field. Quantity of water flowing through each flow channel is the same. The potential drop in any two consecutive equal potential lines is same/constant. Flow lines and equal potential lines are smooth curves.

What is equipotential line?

Equipotential lines are like contour lines on a map which trace lines of equal altitude. In this case the "altitude" is electric potential or voltage. Equipotential lines are always perpendicular to the electric field. In three dimensions, the lines form equipotential surfaces.

### What is seepage water?

Water seepage is when water flows from one place to another via small holes or porous material. Groundwater levels rise, and additional water in the soil creates hydrostatic pressure against your home's foundation. This pressure forces water into your home through the tiniest cracks in your basement's floor and walls.

The maximum value of hydraulic gradient which results in maximum seepage. velocity occurs across smallest square (flow grid). Exit Gradient: The exit gradient is the hydraulic gradient at the downstream end of the. flow line where percolating water leaves the soil mass and emerges into the free water at.

### What are equipotential lines and flow lines?

A flow net consists of two sets of lines, flowlines and equipotential lines. Flowlines or streamlines are the loci of the paths of flow of individual water particles. Equipotential lines pass through points of equal pressure. All intersections between the streamlines and equipotential lines are at right angles.

### What is a flow net in fluid mechanics?

FLUID MECHANICS
Ans.. Answer : A flow net is a grid obtained by drawing a series of equipotential lines and streamlines. Flow net is very much useful in analysing the two dimensional, irrotational flow problems. Usually, the flow net is a square mesh.

### What is seepage flow?

In hydrology, seepage flow refers to the flow of a fluid (water) in permeable soil layers such as sand. The fluid fills the pores in the unsaturated bottom layer and moves into the deeper layers as a result of the effect of gravity. The soil has to be permeable so that the seepage water is not stored.

### What is phreatic line in earth dam?

The top flow line of a saturated soil mass below which seepage takes place, is called the Phreatic line. This line separates a saturated soil mass from an unsaturated soil mass. It is not an equipotential line, but a flow line. For an earthen dam, the phreatic line approximately assumes the shape of a parabola.

### What is seepage in soil mechanics?

geology. Seepage, in soil engineering, movement of water in soils, often a critical problem in building foundations. Seepage depends on several factors, including permeability of the soil and the pressure gradient, essentially the combination of forces acting on water through gravity and other factors.

### What is a flow line geology?

Water table contour lines (or flow lines) are similar to topographic lines on a map. They essentially represent "elevations" in the subsurface. These elevations are the hydraulic head. ( see module 7 - part 2) Water table contour lines can be used to tell which way groundwater will flow in a given region.

### How are the flow paths of groundwater related to contour lines?

Groundwater flow lines, which represent the paths of groundwater downslope, are drawn perpendicular to the contour lines. Remember: groundwater always moves from an area of higher hydraulic head to an area of lower hydraulic head, and perpendicular to equipotential lines.

### How do you determine the direction of groundwater flow?

Groundwater flow direction is reported as degrees clockwise from the positive y-axis defined by your x,y locations. For an unconfined aquifer, the calculation squares the input heads, then fits a plane through these squared heads.