Groundwater studies Ti-Tree Basin 1984-1988
E-Publications; E-Books; PublicationNT; Power and Water Authority Report ; no. 1/1990
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Groundwater -- Northern Territory -- Ti-Tree Region
Water Resources Branch, Power and Water Authority
Power and Water Authority Report ; no. 1/1990
1 v. : ills., maps ; 30 cm.
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own when water is returned with the airlifted sample, is sufficient to cause disaggregation. The hardness of the sandstone is related to the degree of calcification and silicification, both of which were present to a marked degree, frequently in association. It is appropriate to consider the entire saturated thickness of Unit TQt as an aquifer, containing horizons of various degrees of permeability. These horizons can be conveniently grouped as follows: a) silty sandstone, which forms, in terms of volume, by far the largest proportion of sample returns. This is porous (both intergranular and often tubular) but is not highly permeable. Yields exceeding 5 1./s were usually obtained from this material. b) the sand/gravel horizons which occur at various depths throughout the study area. These have a high permeability, but no discernible pattern to depth and spatial variability, and they are also difficult to accurately record in the strata log. c) the limestone/chalcedony horizons encountered in the east of the study area are invariably highly permeable, and often cavernous. These are undoubtedly the best aquifer in the basin in terms of potential. yield, but are associated with poor quality water (e.g. RN 12584). These horizons are considered to be continuous (Figure 15). The grey-green siltstone and s.illv sandstone (Unit Ta) is not an aquifer, although small supplies could be present in the sandier horizons. Where present, the
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