# Hydraulic Conductivity

### Description

These functions are used to calculate a soil's hydraulic
conductivity from standard laboratory tests (`kConstant`

for
the constant head test and `kFalling`

for the falling head test),
and to calculate the equivalent horizontal and vertical hydraulic
conductivity for layered soil deposits (`kx`

and `kz`

,
respectively).

### Usage

1 2 3 4 |

### Arguments

`t` |
time of flow |

`L` |
length of soil sample |

`As` |
cross-sectional area of the soil sample |

`Ds` |
diameter of soil sample |

`V` |
volume of water collected (constant head test) |

`h` |
head difference between inflow and outflow (constant head test) |

`h0` |
head difference at beginning of test (falling head test) |

`hf` |
head difference at end of test (h0 > hf; falling head test) |

`Ap` |
cross-sectional area of the standpipe (falling head test) |

`Dp` |
diameter of the standpipe (falling head test) |

`thk` |
vector of layer thicknesses |

`k` |
vector of hydraulic conductivities |

### Details

Either English or metric units can be used, but they must be consistent.

Either the areas or the diameters of the soil sample (or standpipe) need to be specified.

### Value

kConstant calculates the measured hydraulic conductivity from the constant head test

kFalling calculates the measured hydraulic conductivity from the falling head test

kx calculates the equivalent hydraulic conductivity in the horizontal direction for a layered soil deposit

kz calculates the equivalent hydraulic conductivity in the vertical direction for a layered soil deposit

### Author(s)

James Kaklamanos <kaklamanosj@merrimack.edu> and Kyle Elmy <ElmyK@merrimack.edu>

### See Also

`wellHydraulics`

### Examples

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