References in periodicals archive ?
The pressure head generally declines and the soil displacement gradually increases in aquitard I during all periods as shown in Figure 3.
Aquitard with low permeability exists between coalbed and water body.
Two rock core samples were recovered from site H3: one from a near-surface loess aquitard (low-permeable rock) and one from a limestone joint aquifer (in which water is mainly moving in fractures and joints).
However, mineral Quaternary sediments do not form a sufficient aquitard between the mire and the limestone in order to preserve the Selisoo mire in case of groundwater lowering within carbonate rocks.
Neville interviewed Mayor Karen Farbridge (who wants the mining to stop until real mitigation assurances are in place), two representatives of local advocacy group Wellington Water Watchers (who want the extractors to post a bond for the estimated cost of fallout), and University of Guelph water resources engineer Hugh Whiteley (who says preserving the aquitard is just as important as protecting the aquifer).
The Lower Cambrian aquitard occurs in the northern and north-eastern part of the area.
Other contributions in this issue include an article by Eileen Van der Flier-Keller describing geoscience outreach activities during the British Columbia Year of Science, Stephen Johnston's Presidential Address from the Ottawa GAC-MAC, a historical article by Ian Brookes on longtime GSC geologist Robert Bell's years at Queen's University, a review of the 'roadside geology'-type book, Okanagan Geology South by Jim Britton, and a report by Sarah Agosta and others on the Aquitard Hydrogeology Symposium held last June in Ottawa.
The terms aquifer, aquiclude, and aquitard are relative in a carbonate sequence because of variability in bedding, jointing, and fracturing.
The Uhaku stage is a relative aquitard in the Lasnamae-Ordovician aquifer system between the Lasnamae-Kunda and Keila-Kukruse water bearing horizon.
However, in the presence of an aquitard in the regolith, the flows were more likely to occur laterally than vertically (Macpherson and Sophocleous 2004; Rasiah et al.
"Therefore, locating an industrial of agricultural-related site such as a potash tailing pond of a hog barn atop an aquitard would go a long way to postponing the contamination of groundwater," he noted.
It is separated from the Middle Aquifer by a till unit, herein referred to as the lower aquitard. The lower aquitard is a reddish-brown lodgement till layer that tends to be dominantly dayey of silty in composition.
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