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Pine Creek region surface water resources assessment Vol 1 - Study report Vol 2 - Geotechnical report



Pine Creek region surface water resources assessment Vol 1 - Study report Vol 2 - Geotechnical report


Willing & Partners; Dames & Moore; Earl James & Associates


E-Publications; E-Books; PublicationNT; Report no. 55/1989







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Northern Territory Government

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Report no. 55/1989

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Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



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Technical Report WRD89055 Viewed at 15:07:05 on 29/07/2010 Page 13 of 45. 4 PRELIMINARY SITE SELECTION The lowest specified yield for potential sites was 500 ML/yr. Preliminary calculations and comparison with previous analysis (Department of Transport and Works, 1982) led to the conciusion that this would require a catchment area of about 8 km2. This was consequently adopted as a guide to the minimum size of catchment which should be investigated. The available 1:100,000 topographic maps with 20 metre contours were carefully examined to identify potential darnsites with the necessary minimum catchment area. In this manner, 127 potential sites were selected and these are shown plotted on FigtLres. 2.1 to 2.6 shown in Volume 2 of the study report. Of these 127 sites, 13 were found to be wholly or siguificantly covered by existing 1:10,000 topographic maps with 5 metre contours which straddle the proposed railway corridor. Examinations of these more detailed maps verified the suitability of the 13 sites and thus indicated the appropriateness of site identification from the 1: 1 00,000 mapping. A preliminary selection process was undertaken to identify the apparently most suitable sites from the 127. The principal criteria used were apparent storage depth. embankment width and catchment area In this manner, the candidate list was reduced to 26. These were then checked against the preliminary environmental constraints (Refer Section 2, Volume 2) with the result that only one of the 26 was deleted. It was decided to retain all the remaining 25 sites for preliminary assessment (rather than 20 as proposed in the brief) because 6 were covered by the existing 1:10,000 railway mapping. The locations of the preliminary damsites are shown on Figure 4.1. PINE CREEK REGION SURFACE WATER RESOURCES ASSESSMENT Page 7