permeability of soil
81vertisol — /verr teuh sawl , sol /, n. a clay rich soil in which deep cracks form during the dry season. Cf. black land. [1955 60; VERTI(CAL) + SOL] * * * ▪ FAO soil group one of the 30 soil groups in the classification system of the Food and Agriculture… …
82Drainage system (agriculture) — An agricultural drainage system is a system by which the water level on or in the soil is controlled to enhance agricultural crop production. Contents 1 Classification 1.1 Surface drainage systems 1.2 Subsurface drainage systems …
83Gordonia lasianthus — Loblolly bay or Gordonia lasianthus is a member of the Tea or Theaceae family. Gordonia lasianthus Gordonia lasianthus flower Scientific classification Kingdom …
84Earthquake — For other uses, see Earthquake (disambiguation). Global earthquake epicenters, 1963–1998 …
85Clay — For other uses, see Clay (disambiguation). The Gay Head cliffs in Martha s Vineyard consist almost entirely of clay. Clay is a general term including many combinations of one or more clay minerals with traces of metal oxides and organic… …
86Seismic hazard — refers to the study of expected earthquake ground motions at the earth s surface, and its likely effects on existing natural conditions and man made structures for public safety considerations; the results of such studies are published as seismic …
87Groundwater — Shipot, a common source of drinking water in a Ukrainian village. Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of rock formations. A unit of rock or an unconsolidated deposit is called an… …
88Karl von Terzaghi — Infobox Person name = Karl von Terzaghi image size = 220px caption = Karl Terzaghi at age 43 birth date = October 2, 1883 birth place = Prague, Czech Republic death date = October 25, 1963 death place = Winchester, Massachusetts, United States of …
89Effective stress — Karl von Terzaghi first proposed the relationship for effective stress in 1936. [http://fbe.uwe.ac.uk/public/geocal/SoilMech/stresses/stresses.htm] For him, the term ‘effective’ meant the calculated stress that was effective in moving soil, or… …
90Brown podzolic — soils are a subdivision of the Podzolic soils in the British soil classification. Although classed with podzols because they have an iron rich, or spodic horizon, they are, in fact intermediate between podzols and Brown earths. They are common on …
