![]() The process by which a solute or pollutant moves through an aquifer as a result of molecular diffusion and advection. Net flux of solutes from a zone of higher concentration to a zone of lower concentration. It is the particle size from a sieving process where 50% of the material is finer and 50% of the material is coarser. One of the measures of sediment particle size used to characterise a sediment. Originating at the same time as adjacent material. A common feature of conjunctive use schemes is the use of groundwater storage during dry periods to augment surface supplies thus creating more storage capacity to be replenished during the subsequent recharge period. The managed use of both surface and groundwater to meet variable demand. The sets of joints that are related in deformational origin, usually compression. These aquifers are sometimes called artesian aquifers, the term first being used where the pressure surface was above ground level resulting in overflow under artesian pressure. R² equals 0 when the values of the independent variable do not allow any prediction of the dependent variable from the independent variable.Ī curve drawn to represent the percentage of occurrences of a number of observations of a variable less and greater than any given value for an entire sample.Īn aquifer whose upper and lower boundaries are low permeability layers which confine the groundwater under greater than atmospheric pressure. The closer to 1 the better the independent variable predicts the dependent variable. This is a measure of how well a regression model describes a data set. Stratigraphy that interprets geological history by determining the age and time sequence of the Earth's rock strata.Ī form of groundwater flooding caused by the water table in an unconfined aquifer rising above the land surface in response to extreme rainfall. Movement of recharge water (usually intermittently) through fractures in the unsaturated zone of a dual-porosity aquifer. This term is used to represent the average hydraulic conductivity of a section of aquifer, and is made up of matrix and fracture components. BFI will vary with time so comparisons are only valid for the same period of for long-term averages.Ī distinct volume of groundwater within an aquifer or aquifers as defined under the Water Framework Directive. It is baseflow that sustains the low flow of surface steams and rivers during prolonged dry weather.Īn estimate of the contribution of groundwater to surface flow, taken as a proportion of total streamflow. Natural discharge of groundwater from an aquifer, via springs and seepages, to rivers. The storage of water in an aquifer adjacent to and interconnecting with a surface water body so that a change in a stage of the adjacent surface water body causes a change in storage of water in the aquifer. The deliberate replenishment of the groundwater by means of spreading basins, recharge wells, irrigation, or other means to induce infiltration of surface water. The pressure in such an aquifer commonly is called artesian pressure, and the formation is an artesian or confined aquifer. It may or may not flow out at ground level. Groundwater that is under pressure so when tapped by a well it is able to rise above the level at which it is first encountered. The sum of all the values of n numbers divided by n. ![]() The aquifer may be unconfined beneath a standing water table, or confined by an impermeable or weakly permeable horizon. Mass transport caused by the bulk movement of flowing groundwater in which the mass is dissolved.Ī geological stratum or formation that may be capable of storing water but is unable to transmit it in significant amounts.Ī rock formation that is sufficiently porous and permeable to yield a significant quantity of water to a borehole, well or spring. The removal of water from a groundwater reservoir, usually by pumping.Īdherence of gas molecules, ions, or molecules to the surface of the solids. The process by which substances in gaseous, liquid, or solid form dissolve or mix with other substances. ![]()
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