CG: n
CT: For a geological layer to be capable of bearing an appreciable amount of water, it must have enough gaps or fractures in it to allow water to flow. If there isn’t much space for water, or if it can only flow very slowly, the layer is called an aquiclude.
S: Waiology – http://sciblogs.co.nz/waiology/tag/aquiclude/ (last access: 11 July 2014)
N: 1. From Latin aqui-, comb. form of aqua “water” and -clude, from Latin claudere, “close”.
2. Although there is a common perception that ground water is stored in huge underground caverns, in fact ground water fills the pores of the various kinds of rocks that form the earth below us. Aquifers are underground layers of very porous water-bearing soil or sand. Aquitars, by contrast, are compacted layers of clay, silt or rock that retard water flow underground; that is, they act as a barrier for groundwater. Aquitards separate aquifers and partially disconnect the flow of water underground. Also known as cap rocks, aquitards limit and direct the surface water which seeps down and replenishes aquifers.(…) At the very end of the spectrum, an aquiclude is a geological material through which zero flow occurs. However, it’s usually difficult to distinguish aquitards from aquicludes. This is partly because of the impracticality of taking measurements in such tight materials, but also because research has historically focused on high-yielding aquifers, and relatively permeable reservoirs for oil and gas.
S: 1. OED – http://www.etymonline.com/index.php?term=aqua&allowed_in_frame=0 (last access 15 September 2015).
2. Groundwater Research – http://www.groundwater.com.au/media/W1siZiIsIjIwMTMvMDEvMTcvMjFfMDNfMjlfNzg0X1VuZGVyc3RhbmRpbmdfYXF1aXRhcmRzX2FuZF9hcXVpY2x1ZGVzX0ZJTkFMLnBkZiJdXQ/Understanding+aquitards+and+aquicludes_FINAL.pdf (last access: 15 September 2014).
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