Spring Line Settlement
Spring line settlements occur where a ridge of permeable rock lies over impermeable rock, resulting in a line of springs along the contact between the two layers. Spring line (or springline) settlements will sometimes form around these springs, becoming villages. In each case to build higher up the hill would have meant difficulties with water supply; to build lower would have taken the settlement further away from useful grazing land or nearer to the floodplain. Spring line villages are often the principal settlements in strip parishes, with long, narrow parish boundaries stretching up to the top of the ridge and down to the river but being narrow in the direction of adjacent spring line villages. Some examples in England * to the north and south of the Howardian Hills in the North Riding of Yorkshire. * to the west and east of the ridge that stretches south from Lincoln and on top of which is the Roman road Ermine Street. The western line (which includes Boothby Graffoe and N ...
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Permeable
Permeability, permeable, and semipermeable may refer to: Chemistry *Semipermeable membrane, a membrane which will allow certain molecules or ions to pass through it by diffusion *Vascular permeability, the movement of fluids and molecules between the vascular and extravascular compartments *Permeation of a gas or vapor through a solid substance Earth and soil science *Permeability (earth sciences), a measure of the ability of a material (such as rocks) to transmit fluids **Relative permeability, in multiphase flow in porous media *Permeability (foundry sand), a test of the venting characteristics of a rammed foundry sand *Hydraulic conductivity, the permeability of soil for water Electromagnetism *Permeability (electromagnetism), the degree of magnetization of a material in response to a magnetic field **Vacuum permeability, permeability of free space or magnetic con