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).
Dept. of Transport and Works
Report ; 6/1984
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Technical Report WRD84006 Viewed at 14:07:13 on 29/07/2010 Page 15 of 60. Linsley and Franzini (Ref 2) suggests a specific yield for fine sands to be 0.25. In comparison, the lesser specific yield of the weathered strata encountered by bores RN 20922 and RN 20927 may well be representative if the reduction is attributed to minor cementation between sand grains. A value of 0.10 has been adopted and is considered conservative. The aquifer parameters calculated from each test is su~~arised in Table 2.2 2.2.2 Tidal Efficiency Test This test has enabled an approximation of the storage coefficient to be made from the results of testing bore RN 20921. It is recommended that an accurate test using this method for evaluating the transmissivity and storage coefficient be undertaken as an alternative to test pumping. Several bores should be monitered during the test to obtain representative values of transmissivity and storage coefficient. The data required is: (i) amplitude of oscillation at both bore and sea shore; (ii) times at which extrema occur; (iii) distance from the bore to the sea shore. A transmissivity and storage calculated by using the relationship below: coefficient from Hazel can (Ref where x tL to T S 1: REP3 -x,!rrSjt T' o - xlt Sj41IT o The amplitude of groundwater fluctuations at distance x from the shore The amplitude of tidal fluctuations at the shore distance of the observation bore from the shore the time lag in tidal/groundwater oscillation the tidal period Transmissivity Storage coefficient be 1)
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