Inquiry into the Alice Springs Recreation Lake : submission by Department of Transport and Works
E-Publications; E-Books; PublicationNT; Report ; 1/1983
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Date:1983-12; Contains: Floodplains Management Alice Springs Impacts of Todd River Flooding. Also filed in Alice miscellansous collection A0342, A0343.
Dept. of Transport and Works
Report ; 1/1983
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Technical Report WRD83001 Viewed at 14:07:22 on 29/07/2010 Page 11 of 64. i i I An update of that report, based on using new data, has now reached Attachment 4. refined flood estimates draft form and is at It is unfortunate that the primary justification presented for the lake continued to be that of recreation, with the flood mitigation benefit being referred to as side-benefit. In retrospect, the proper approach, once the flood mitigation aspect had been recognised, would have been to present it as a multi-ourpose lake. The floods of March 1983 led to a heightened public awareness of the flood risk. The flood in the river itself, being of a return period of about 15 years, ,,"as close to the largest flood which the river can acco~modate without extensive overtopping of the banks. A co~"on misconception displayed in the media following the flood, was that "Cne dam would have no flood attenuation effect if it happened to be full when the flood corr~enced. Attemnts were made to rectify this in subsequent displays d -.. 1 an ar-clc_es .. It is submitted that the severity of the flood risk in Alice Springs, and the potential for economic benefit frem mitigation, are such that flood mitigation must be seriously considered. Such mitigation can only be practically achievec by building a dam. If the option to construct the darn at the Telegraph Station is not available ( iTILrnediate consideration must be given to the construction of one or more dams 2t sites upstream. As there is no single apparent site offering flood mitigation potential which is comparable with that of the Telegraph Station site, a considerable amount of investigation and economic analysis will be required to determine the optimum scheme. (h) Irrigation The feasibility studies showed that a draft of UD to one million cubic metres per year could be taken with little effect on the lake. This is the amount of ~'later which, J..n conjunction with development of the town groundwater basin, would be capable of irrigating most of the public or semi-public recreation grounds. Such a scheme would have the advantage that, apart from the initial capital cost, the operating cost per kilolitre would be far cheaper than water from the Roe Creek borefield (the source of the main town water supply) owing to the relatively small pumping head which would be involved. Providing the water so used was chemically at least as good as the alternative supply, as is generally expected, there would be no adverse effects of such irrigation On the town basin salinity problem. 11:ANDYS
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