Katherine Groundwater Investigations, Cretaceous Sediments near the King River,1985.
Yin Foo, Des
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Report ; 3/1985
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Technical Report WRD85003 Viewed at 14:07:03 on 29/07/2010 Page 17 of 45. T~"o bores, 22741 and 22746 at Bamyi1i were used to test the aquifer over a period of twenty-four hours. Two observation bores were monitored during each test. The results indicated the transmissivity of the aquifer to be in the order of 600 m2 /day. The response of observation bores indicates initial semi-unconfined behaviour of the aquifer. This can be attributed to minor elastic reponse of the formation, delayed drainage characteristics and the stratified nature of the sandstone which also gives rise to 'fingered' effects. The later drawdown data was used to obtain a long term specific yield of the formation. However, the tests were not performed for a sufficient period which could enable accurate type curve analysis. This data was also analysed using a straight line approximation. The results in Table 2.2 indicates the specific yield to be between 2 and 3 percent. Constant discharge tests have been conducted on two bores 9631 and 9632 (Eva Valley Homestead) at rates of 6.0 Lis and 3.4 Lis respectively. Only the pumped bores were monitored during each test. The average transmissivity was calculated to be 660 m 2 /day. Bore 23540, constructed during the investigation, was tested for a duration of 4700 minutes at a rate of 3.0 Lis. Observation readings were measured from a bore 23424 at 30.2m distant. The small drawdown response (maximum drawdown 0.07 m) was distorted by daily fluctuations of water levels Which are of the same order of magnitude. These results were consequently not considered for any further analysis. Table 2.2 is a summary of the results of the tests above. The drawdown - time plots for those tests are shown on Figures A3(a) to (g). DYF:TJ:79 04:REP4