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Bore completion report. Bore 27617. Pigeon hole dlh-693 excision.



Bore completion report. Bore 27617. Pigeon hole dlh-693 excision.


Sanders, R.


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Technical Report WRD90101 Viewed at 15:07:43 on 29/07/2010 Page 6 of 12. 1. INTRODUCTION Pigeon Hole is an Aboriginal community living area adjacent to the Victoria River Downs Outstation of the same name. Bore 2027, in the midst of the camp, presently supplies water used for domestic and irrigation purposes. This report details the results of further drilling at Pigeon Hole in response to a request from Aboriginal Essential Services (Katherine) for an improved groundwater supply at this site. The project was undertaken by the lvater Resources Division of the Power and Water Authority with the aim of providing a further production bore yielding at least 1 Lis. This would provide water for the expected population of 40 people. Access is via a formed road which Camf ield Home stead. The region is scale Topographic 14ap Pigeon (AMG 8139250). travels north from the covered by the 1: 100,000 Grid Reference 736600 The community lies on the edge of an alluvial/basalt plain adjacent to the Victoria River. The climate is monsoonal, with a long warm dry season between April and October and a hot rainy season from November to March. Rainfall is mainly from thunderstorms associated with the northwest monsoon and the annual average is about 650mm. Pan evaporation is about 3400 mm. An initial desktop study was undertaken in early 1989. Bore sites were pegged and access checked in May 1989, but required repegging in June 1991, due to the presence of Aboriginal sacred sites. Drilling and pump testing of the resulting production bore was undertaken in June 1991. 2. HYDROGEOLOGY The region is covered by the 1:250,000 scale Geological Series Map Victoria River Downs (Sheet SE 52-4). The area is underlain by Lower Cambrian Antrim Plateau Volcanics. The vOlcanics consist of basalt of variable nature with interbedded sandstone lenses. The basalt is made up of a number of overlapping flows of varying thickness. In the contiguous flow zones the basalt is vesicular, ashy and brecciated. The sandstones occur as elongate northwest-aligned bodies that are considered to be consolidated longitudinal aeolian dunes. They consist of friable, cross-bedded quartz sandstone. The basalt of the flow interiors is of low permeability, but zones between the successive flows may act as confined aquifers. Similarly the interbedded sandstones may constitute local or regional confined aquifers with primary or secondary porosity. 005bRS