confining unit — 1. A hydrogeologic unit of impermeable or distinctly less permeable material bounding one or more aquifers and is a general term that replaces aquitard, aquifuge, aquiclude [22]. 2. Means a body of impermeable or distinctly less permeable… … Lexicon of Cave and Karst Terminology
hydrostratigraphic unit — See hydrogeologic unit … Lexicon of Cave and Karst Terminology
storage coefficient — 1. The volume of water an aquifer releases from or takes into storage per unit surface area of the aquifer per unit change in head [22]. In a confined aquifer, the water is derived from storage with decline in head resulting from an… … Lexicon of Cave and Karst Terminology
MODFLOW — simulation MODFLOW is the U.S. Geological Survey modular finite difference flow model, which is a computer code that solves the groundwater flow equation. The program is used by hydrogeologists to simulate the flow of groundwater through aquifers … Wikipedia
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contaminant plume — An elongated body of ground water containing contaminants, emanating and migrating from a point source within a hydrogeologic unit(s) [22] … Lexicon of Cave and Karst Terminology
drainage well — 1. A well installed to drain surface water, storm water, or treated waste water into underground strata [22]. 2. A water well constructed to remove subsurface water or to reduce a hydrogeologic unit’s potentiometric surface [22] … Lexicon of Cave and Karst Terminology
drawdown — 1. The vertical distance the water elevation is lowered or the reduction of the pressure head due to the removal of water [22]. 2. The decline in potentiometric surface at a point caused by the withdrawal of water from a hydrogeologic unit… … Lexicon of Cave and Karst Terminology
leakage — 1. The flow of water from one hydrogeologic unit to another. The leakage may be natural, as through semi impervious confining layer, or manmade, as through an uncased well [22]. 2. The natural loss of water from artificial structures as a… … Lexicon of Cave and Karst Terminology
solute transport — The net flux of solute through a hydrogeologic unit controlled by the flow of subsurface water and transport mechanisms [22] … Lexicon of Cave and Karst Terminology
