# Seepage

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Related to Seepage: seepage force

## seepage

[′sēp·ij]
(fluid mechanics)
The slow movement of water or other fluid through a porous medium.
(hydrology)
The slow movement of water through small openings and spaces in the surface of unsaturated soil into or out of a body of surface or subsurface water.

## Seepage

(Russian, fil’tratsiia), the movement of a liquid—such as water or petroleum—or a gas—such as air or natural gas—through a porous medium in the ground beneath the surface of the earth. Seepage also means the percolation of water through soil or concrete, for example, through the body of an earth or concrete dam. In Russian, the term fil’tratsiia is often used along with the term fil’trovante (filtration) to describe similar processes that occur under industrial or laboratory conditions (seeFILTRATION).

The flow rate of a seeping liquid or gas is usually given by the relation Q = kShw/L, where k is the empirical coefficient of seepage, S is the total cross-sectional area of the seepage and includes the cross sections of both pores and solid particles, and hw is the head loss over the length L of the seepage path. The seepage velocity is given by Darcy’s law: W = kl, where hw/L = I is the pressure gradient, which is also called the hydraulic gradient and indicates the pressure drop per unit length of the seepage path. The seepage velocity is less than the actual flow rate of the liquid or gas in the pores because the fluid moves only through the portion of the cross-sectional area S that is occupied by the pores. Darcy’s law is valid for a laminar flow in the pores of a filter medium; seepage is a laminar flow in most cases, for example, in sandy and clay soils or in concrete.

Seepage in coarse-grained materials, such as the rock used in rock-fill dams, is a turbulent flow. For such a flow, the seepage velocity is given by other relations, for example, W = kIm where k’ and m are seepage characteristics of the material. Here, k’ is analogous to the coefficient of seepage, and m ranges from 1 to ½.

### REFERENCES

Aravin, V. I., and S. N. Numerov. Teoriia dvizheniia zhidkostei i gazov v nedeformiruemoiporistoisrede. Moscow, 1953.
Polubarinova-Kochina, P. Ia. Teoriia dvizheniia gruntovykh vod. Moscow, 1952.
Shchelkachev, V. N., and B. B. Lapuk. Podzemnaiagidravlika. Moscow-Leningrad, 1949.
Bogomolov, G. V. Gidrogeologiia s osnovami inzhenernoi geologii, 2nd ed. Moscow, 1966.

## seepage

1. The slow movement of water through a soil.
2. The quantity of water which has slowly moved through a porous material, such as soil.
References in periodicals archive ?
A severe groundwater seepage and soil erosion condition could have jeopardized the stability of the entire dam abutment.
The principal outputs are the area and volume of seepage of groundwater from the deeper layer into the shallower layer, and the streamflow, as both maps and numerical data.
Earth-Rock Dam Seepage Statistical Model considering the Hysteretic Effect of Reservoir Water Level and Precipitation and the Exceeded Water Level Factor
Ontario's Ministry of the Environment and Climate Change confirmed Vale was required to upgrade its seepage collection system at the site when issues were raised in 2012.
Key words: Seepage, Anisotropic properties, cutoff, embankment, blanket and dams.
In general, water seepage in faults and the impermeability of faults are studied by laboratory tests, numerical analysis and theoretical analysis (Zhou et al.
DPWH also plans to apply the same solution to other tunnels and underpasses with the same seepage problems.
If it's really minimal seepage, the dealer may be right.
Seepage from canals, infiltration due to precipitation, water applied for irrigation and water stored in depression storages play an important role in increasing groundwater level.
The Federal Review Panel's assessment of the New Prosperity railings storage facility relied heavily on modeling by Natural Resources Canada (NRCan), indicating that seepage into Fish Lake from the facility would cause significant adverse effects on fish and fish habitat, wetlands, and aboriginal interest in the Fish Lake area.
The sources said that the project will also be instrumental in bringing additional land under cultivation, as more water will be made available for irrigation due to control of seepage from the two canals.

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