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- W2299122051 abstract "Applied tracers were used during a long term (60-day) pumping test to assess the hydrologic impacts of pumping on groundwater-surface water connectivity in the Doudles Folly Creek catchment, in the Southern Highlands of New South Wales, Australia. The aims of the applied tracer test were to estimate the degree of connection between the creek and the fractured sandstone aquifers of the Hawkesbury Sandstone in the Doudles Folly Creek catchment, better understand flow in fractured sandstone aquifers and to extrapolate trends to other streams in the Sydney Basin. The dissolved gas, sulfur hexafluoride (SF6), was continuously applied to Doudles Folly Creek during the pumping test and monitored at stream gauging locations and groundwater monitoring locations. The results of the gas tracer test showed that near the end of the test approximately 5% of water produced at the pumping bore was derived from the SF6-applied reach of Doudles Folly Creek. In this section of the creek, seven major vertical fractures were identified. Pumping resulted in fast transport velocity, with SF6 being detected in the pumping bore (located 260 m from Doudles Folly Creek) in less than 5 days. These results indicate a transport velocity within the primary pathways on the order of 60 m/day. A short-term (one day) injection of a discrete volume of fluorescein tracer was applied to an observation well after initial pumping draw downs stabilised. The concentration was measured until breakthrough in the production (pumping) bore using a portable fluorometer. Tracer breakthrough occurred within approximately 15 minutes and approximately 40% of the tracer was recovered in 250 minutes. The results of the tracer test suggest that the observation well and pumping bore are connected by a single primary fracture zone. Generally, the study results emphasise the significance of fracture flow in the Hawkesbury Sandstone and provide a basis for production bore locations and spacing, and the sustainability of borefield development." @default.
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- W2299122051 date "2008-01-01" @default.
- W2299122051 modified "2023-09-26" @default.
- W2299122051 title "Investigation of Groundwater-surface Water Connectivity Using Applied Tracers in the Doudles Folly Creek Catchment, New South Wales, Australia" @default.
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