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Galiwinku Groundwater Resource and Evaluation DLH-492



Galiwinku Groundwater Resource and Evaluation DLH-492


Yin Foo, Des


E-Publications; E-Books; PublicationNT; Report ; 6/1984




Made available via the Publications (Legal Deposit) Act 2004 (NT).





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Dept. of Transport and Works

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Report ; 6/1984

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Technical Report WRD84006 Viewed at 14:07:13 on 29/07/2010 Page 30 of 60. Figures 4.1 (b) and (c) show the resulting 0.5m drawdown contours for both regimes. Interaction of bores, and possible salt water intrusion was examined. For both pumping regimes above, a drawdown of 0.5 m resulted at the suspected intrusion point after 300 days of pumping. In view of the conservative approach of the model, a drawdown of this magnitude may be regarded as safe. However, it is not recoIDWEnded to increase the extraction beyond 30 Lis until a refinement of the model is achieved. A reassessment of the aquifers performance is recoro.mended in 1990 when at least five years of water level data should become available. The low storage coefficient of the confined aquifer is reflected in the widespread drawdowns occurring. Results of the model indicates that borefield expansion should aim at exploiting the north eastern segment where the aquifer is unconfined. 4.2 Borefield Management Water consumption figures in Section 3 indicate that at the current- rate of usage and growth rate, the water supply mc.y require upgrading by 1988 to accommodate peak demands. The pumping regime recommended to upgrade the system includes bores RN 20921, RN 20927 and RN 6252 to produce a total of 30 Lis. This configuration results in a favourable drawdown characteristic, with the minimum number of operational bores. Table 4.2 below is a summary of the current and proposed pumping regimes and recommended standby bores. TABLE 4.2 BORE R.1\l 20921 20927 6252 20922 8476 8474 8475 RECO~lliENDED PUMPING REGIMES PEAK REQUIREMENT 23.8 Lis (current) 13.3 2.3 5 * 5 * 3.2 5.0 30 Lis 10 15 5 5 * 5 * * Denotes recommended standby bore

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