# Hydraulic conductivity (as a function of water)

## Description

By definition, hydraulic conductivity is the ratio of velocity to hydraulic gradient indicating permeability of porous media.

Civil engineers predominantly work on problems that involve water and predominantly work on problems on earth (in earth’s gravity). For this class of problems, civil engineers will often write the hydraulic conductivity as a function of water (see Darcy’s law simplified formula)

Related formulas## Variables

k | hydraulic conductivity (m/s) |

K | Coefficient of permeability of the soil (m^{2}) |

ρ_{w} | density of pure water |

g | Standard gravity |

μ_{w} | dynamic viscosity of water (Pa*s) |