![]() Often also used as an adjective, to indicate the age of a geological formation. Cainozoic (also: Cenozoic)Įra in geological history, running from roughly 66 million years ago until the present. Its diameter is usually small, and its purpose is commonly either geological exploration or the construction of a well for abstracting or injecting liquids (e.g. Hole made in the soil or the earth’s upper crust by drilling. Water containing dissolved solids in a concentration between 1 000 and 10 000 milligram per litre. ![]() ![]() Wastewater containing faeces or other remnants of sanitary use. Solid rock that is relatively unaltered and has not become soft (thus it is rather dense, and usually of low porosity). The oldest rocks recognized in a given area, a complex of metamorphic and igneous rocks – usually Precambrian or Palaeozoic in age – that underlies all sedimentary formations. It is mainly fed by the discharge of groundwater systems and is sometimes called ‘dry-weather flow’. The steady flow component of stream flow that continues for a long time after rainfall has stopped. A well tapping an artesian aquifer is called a ‘flowing well’ or ‘artesian well’. In other words: the piezometric level of groundwater in an artesian aquifer is located above ground level. Groundwater pressure condition that allows groundwater to rise to above the local ground surface, if a well is drilled to the zone where such pressure is present (‘artesian aquifer’). In agriculture this term is used to indicate extremely dry areas where without irrigation no crops can be grown. A region of low precipitation, characterized by a severe lack of available water, to the extent of hindering or even preventing the growth and development of plant life.
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