groundwater

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groundwater

Water below the earth's surface, saturating soil and rock at the level of the water table and below. It supplies approximately 35 percent of the drinking water in the country and, as such, is a source of much concern for the Environmental Protection Agency. If one purchases a property with contaminants, and those contaminants have leached into the groundwater, then remediation will usually be required before development can proceed.

References in periodicals archive ?
The residence time of the solutes was defined by the ratio of length of soil column to pore-water velocity and multiplied by R.
But 1970-81 provided Ross's classical treatment of disturbance to permafrost terrain (1970); segregation as the origin of massive ice (1971); preservation of permafrost and ground ice beneath the Laurentide ice sheet (1972); the origin of offshore permafrost (1972); the development of pingos from pore-water expulsion (1973); the influence of snow cover on ground temperatures (1974); the characteristics of thermal contraction cracking (1974); experimental demonstration of pingo growth (1977); identification of an early-Holocene thaw unconformity (1978); the origin of hummocks (1980); and plug-like flow in solifluction (1981).
The dissipation of pore-water pressure in the embankment is largely influenced by the permeability and the storage characteristic of the embankment materials.
Sediment diatom assemblages and composition of pore-water dissolved organic matter reflect recent eutrophication history of Lake Peipsi (Estonia/Russia).
The analysis can use either the Darcy velocity, q, or the pore-water velocity, v = q/[theta]; we prefer the latter because (i) the resulting equations are simpler, and (ii) we use v in the later analysis of our experiments with CXTFIT 2.
Although the initial pH of the cement pore-water varied between 13 and 14, during the tests, the pH of the effluents reached a maximum of 11.
For a saturated sand under undrained conditions, the tendency for volume reduction during each cycle of loading results in a corresponding progressive increase in pore-water pressure.
Pore waters were separated from sediments by centrifugation, and the concentration of adsorbed ammonium was determined as the difference between total- and pore-water ammonium.
PORE-WATER PRESSURE AND WATER TABLE VARIATION DURING EARTHQUAKE SIMULATIONS.
Soil nitrate concentrations were calculated on both a soil (mg/kg dry soil) and pore-water basis [(mg/kg dry soil)/gravimetric water content].
During each field season, I measured pore-water salinity at 15-cm depth in the rhizosphere of each experimental tree.
2] distribution in the sediment pore-water with sufficient spatial and temporal resolution.