Definitions for

**"Hydraulic Conductivity"****Related Terms:**Permeability, Transmissivity, Specific yield, Percolation rate, Aquifer, Pore volume, Aquitard, Aquiclude, Aquifers, Effective porosity, Degree of saturation, Impermeable, Confining layer, Groundwater, Percolation, Darcy, Perched water, Permeable, Field capacity, Unsaturated flow, Pore water, Ground water, Water content, Saturated zone, Porosity, Capillary fringe, Groundwater recharge, Water table, Groundwater level, Percolate, Soil porosity, Potential evapotranspiration, Infiltration, Groundwater table, Spring water, Unconfined aquifer, Saturated, Recharge, Phreatic, Impermeable layer, Zone of saturation, Capillary water, Drawdown, Seepage, Infiltrate, Perched water table, Underflow, Water-table, Lysimeter, Soil moisture

The ability of a porous material to transmit a fluid. Permeability.

the measure of how easily a medium can transmit a specified fluid. In groundwater terms it relates to an aquifer's ability to transmit water and is often expressed in terms of metres/sec.

Ratio of flow velocity to driving force for viscous flow under saturated conditions of a specific liquid in a porous medium.

The extent to which a given substance allows water to flow through it, determined by such factors as sorting and grain size and shape.

A term used to describe the ease with which water moves through soil or a saturated geologic material. Hydraulic conductivity is influenced by the type of material comprising the formation (sand, gravel, rock, limestone, sandstone, clay), the slope of the water table, the type of fluid, and the degree to which existing pores are interconnected.

The hydraulic conductivity of a soil is a measure of the ease at which water moves through the soil. It can be obtained experimentally by measuring the flux density of water passing through a soil, the difference in total potential and the length of the soil. The conductivity is the proportionality constant which when multiplied by the driving force (or gradient in total potential) causing water to move gives the flux density of water. If the potential is defined in terms of a unit weight of water, then the gradient in total head has no dimensions and the conductivity has units of length per unit time just as the flux density does.

The ability of subsurface materials (sand, rock etc.) to allow a fluid (ie water) to flow through it.

The proportionality factor (L t ^ -1) relating water flux density to a hydraulic gradient. Highly dependent on wetness for a given set of soil conditions.

Hydraulic Conductivity - Used to describe the ease with which water moves through soil or a saturated geologic material.

(3) The property of a soil that governs the rate of ground water flow within it. The hydraulic conductivity of a particular soil is defined by the size, abundance, and geometry of its open pores; the rate of ground water flow increases with increasing hydraulic conductivity. Fine-grained soils such as clay and silt have very small pores and have much lower hydraulic conductivities than coarse-grained soils such as sand and gravel. (4) a measure of the ability of a fluid to move through the interconnected void spaces in a sediment or a rock. Flow through a porous medium in response to a unit potential gradient. Hydraulic conductivity depends on both permeability and properties of the fluid such as viscosity and density.

Capability of water to move through soil or rock.

Related Topics: [ drainage] A measure of the ease with which water moves through soil. It has the dimensions of velocity, distance/time. Permeability is often, imprecisely, used as a synonym.

The ease of movement of water through the soil relative to a potential gradient.

The volume of water will move in a porous medium in unit time under a unit hydraulic gradient through a unit area measured at right angles to the direction of flow. In contrast to permeability, it is a function of the properties of the liquid as well as of the porous medium.

A measure of the rate at which water can move through a permeable medium if the hydraulic gradient of the ground-water flow system is unity (45 degrees).

refers to the readiness of soil to permit fluid flow through it; both soil and fluid characteristics determine the extent of this property.

The hydraulic conductivity of a medium is the volume of water at the existing kinematic viscosity that will move in unit time under a unit hydraulic gradient through a unit area measured at right angles to the direction of flow.

the term used to describe the permeability of water through a medium; a controlling factor on the rate at which water can move through a permeable medium

A measure of the rate at which water moves through a unit area of the subsurface under a unit hydraulic gradient. It is a function of the media and the fluid flowing through it.

As applied to soils, the ability of the soil to transmit water in liquid form through pores.

The rate of flow of water in gallons per day through a cross section of one square foot under a unit hydraulic gradient, at the prevailing temperature (gpd/ft2). In the SI system, the units are m3/day/m2 or m/day.

a coefficient of proportionality describing the rate at which water can move through a permeable medium. Hydraulic conductivity is a function of both the intrinsic permeability of the porous medium and the kinematic viscosity of the water which flows through it. Also referred to as the coefficient of permeability.

A measure of the rate at which water will move through a permeable soil or rock layer. For a particular soil or rock layer, the hydraulic conductivity may not be the same in the horizontal direction as in the vertical direction.

A measure of the capacity for a rock or soil to transmit water; generally has the units of feet/day or cm/sec.

Proportionality constant relating hydraulic gradient to specific discharge, which for an isotropic medium and homogeneous fluid, equals the volume of water at the existing kinematic viscosity that will move in unit time under a unit hydraulic gradient through a unit area measured at right angles to the direction of flow.

The capability of water to move within the soil matrix driven by matrix and gravitational potentials, (cm/s; in/hr) dependent on soil texture and moisture content.

Ability of a rock or sediment to transmit water under a unit hydraulic gradient.

the capacity of a porous medium to transmit water through a unit cross-sectional area. Hydraulic conductivity is dependent upon the physical properties of the porous medium and the viscosity of the water and is expressed in units of length/time.

Refers to the capability of subsurface materials (sand, rock etc.) to allow a fluid (usually water) to flow through it.

The capacity for a substance (soil) to conduct water through it. measured in units of volume (e.g. cubic inches) per unit time (e.g. seconds).

Rate of water flow in soil as imposed by a hydraulic head.

The rate of flow of fluid through soils.

A coefficient describing the rate at which water can move through a permeable medium. K depends on water viscosity and density. Hydraulic conductivity replaces the term permeability.

The rate at which a soil allows water to move through it.

a coefficient of proportionality that describes the rate at which a fluid can move through a permeable medium

The rate of flow of water through a given cross section of area under hydraulic gradient at the prevailing temperature.

A measure of the rate at which water flows through a unit cross section under unit hydraulic gradient. Also known as permeability coefficient.

() the proportionality factor in Darcy's law, indicating the soil's ability to transmit flowing water.

A measure of the ability of groundwater to flow through the subsurface environment.

A quantitative measure of how easily water flows through soil. (Compare to infiltration and permeability.).

capacity of a geological material for allowing the flow of water

Factor of proportionality in Darcy's equation relating flow velocity to hydraulic gradient having units of length per unit of time. A property of the porous medium and the fluid (water content of the medium).

See Permeability.

The rate of flow of the water through the unit cross section of a soil under a unit hydraulic gradient (= soil permeability)

The capacity of rock or soil formations to transmit water to a pumping well. Capacity is related to the amount and size of interconnecting pore spaces in the rock.

the volume of fluid passing through a unit cross section in unit time under the action of a unit hydraulic potential gradient.

The rate of water flow through the soil.

The rate at which water can move through a permeable medium. (i.e. the coefficient of permeability.)

The proportionality constant between the volumetric flux and the hydraulic gradient, as in Darcy's law. It includes the effects of the pore structure, and the viscosity and density of the water.

The coefficient K in Darcy's law; hydraulic conductivity takes into account the permeability of the sediment or rock as well as the fluid's viscosity.

The rate at which water will move through soil in response to a given potential gradient.

Hydraulic conductivity, symbolically represented as K, is a property of soil or rock, that describes the ease with which water can move through pore spaces or fractures. It depends on the intrinsic permeability of the material and on the degree of saturation. Saturated hydraulic conductivity, Ksat, describes water movement through saturated media.