Alpurrurulam Community : bore completion report RN 16925 to RN 16927
Alpurrurulam Community, bore completion report RN 16925 to 16927.
Burton, S.; Dames & Moore
Northern Territory. Power and Water Corporation
E-Publications; E-Books; PublicationNT; Report No: 39/1996
Drilling and boring -- Northern Territory; Groundwater -- Northern Territory; Water-supply -- Northern Territory; Bores -- Northern Territory
Northern Territory Government
Report No: 39/1996
1 v. : illustration, map ; 30 cm.
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
Table 2 shows calculated well efficiencies (using the Biershenck and Wilson method). Table 2. Well Efficiency (Biershenck and Wilson) - RN 16927 Step Q (lJs) L.1.sw Efficiency (:BQIL1.sw) 1 0.5 1.220 89% 2 1.0 2.60 77% 3 2 6.34 64% 4 3.3 12.80 52% B= 0.023 m. The constant discharge test data indicated a leaky confined response to pumping. Leakage was induced after approximately 10 minutes of pumping and overlaps possible well storage effects. The aquifer transmissivity could not be determined by curve-matching or line-of-bestfit methods, however, Logan's approximation indicates a transmissivity of approximately 39 m2/day. The storativity could not be determined. The aquifer thickness was estimated during drilling to be approximately 12 metres. A hydraulic conductivity of approximately 3.25 m/day is thus calculated. This is consistent with a low permeability karst limestone (Driscoll, 1986). A leaky confined fractured rock aquifer provides groundwater to RN 16927. Higher transmissivities were reported by Matthews (1992) for other bores installed at Alpurrurulam. The higher figures are considered to be excessive and based on the slope of the drawdown versus time curve after intersection of the cone of depressurisation with hydraulic boundaries. 6.2.2 Recommended Pumping Rates RN 16925 The recommended pumping rate for RN 16925 has been calculated based on linear projection of the late time drawdown trend plotted on semilogarithmic paper. The projected drawdown after two years of pumping at the test rate (1.6 lJs) is 6.7 m (note that the effect of pumping at RN 13833, visible on the plot, has not been accounted for). The maximum desired drawdown (based on retaining the water level above the slotted portion of the casing to minimise corrosion) is 10.9 m. The calculated maximum pumping rate is 2.6 lJs. The recommended pumping rate, taking into account potential interference drawdown and well efficiency (the limiting factor), is 1.0 lJs. RN 16927 The recommended pumping rate for RN 16927 has been calculated based on linear projection of the late time drawdown trend plotted on semilogarithmic paper. The projected drawdown after two years of pumping at the test rate (3.3 Us) is 9.3 m. The maximum desired 14
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