In hydrologic terms, a formation which contains water but cannot transmit it rapidly enough to furnish a significant supply to a well or spring.
Rocks which have a very Iow permeability and are capable of acting as a barrier to groundwater flow.
An aquiclude is a saturated geologic unit that is incapable of transmitting significant quantities of water under ordinary hydraulic gradients. In Jamaica, there are three general types of aquiclude: Alluvium aquiclude is composed mainly of clay which is deposited by physical processes in river channels or on flood plains. Basement aquiclude is composed of volcanics and volcaniclastic sediments of Cretaceous ages and the overlying Yellow Limestone Group (calcarenites of Lower Eocene age). Coastal aquiclude is composed of soft marls and is patchily distributed along the coast of Jamaica.
Impermeable beds of geologic material that hinder or prevent groundwater movement.
Sediment or rock that transmits no water.
A stratum with low permeability that acts as a barrier to the flow of groundwater. Also called "confining layer."
A subsurface rock, soil or sediment unit that does not yield useful quanties of water.
a body of rock that does not conduct water in usable amounts
a layer of rock that acts as a barrier to ground water flow because of low porosity and/or low permeability
A relatively impermeable underground confining unit, such as a clay. These saturated geologic units are incapable of transmitting significant quantities of water under ordinary hydraulic gradients. Very few formations fit the classical definition of an aquiclude.
An impermeable layer of rock that does not allow water to move through it. Some shales, for example, have such low permeability that they effectively form an aquiclude.
a formation so impermeable that it will not transmit enough water for a well or a spring.
A bed, formation or group of formations essentially impervious to water
A geologic formation that is saturated but is incapable of transmitting sufficient quantities of water to a well. Also, this type of formation is not capable of transmitting enough water to be considered as a significant part of the regional ground water system.
A geologic formation which may contain water but does not transmit it.
A geologic formation which, although porous and capable of absorbing water slowly, will not transmit it fast enough to furnish an appreciable supply of water to a well or spring.
Aquiclude - A geologic formation or stratum that confines water in an adjacent aquifer. It has a permeability of zero.
A rock formation of low permeability and transmissivity that absorbs or transmits water slowly
A material which will not transmit water.
A geologic formation that may contain water but is incapable of transmitting water in significant quantities.
very low permeability rock stratum obstructing the passage of groundwater