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 7 of 64. (c) site Geology Detai=-ed site investigations carried out by the Department of Mines and Energy established that the granitic rocks of the site are sound and there are no special problems in respect of construction of a dam. The investigations found that to achieve an acceptable degree of water tightness under the dam, conventional curtain ~. . ~f' ren h Iould be rea-ul' red t'n h -_, 0 grouL...l.ng or CU'C D.!.. "C .c.. r1 _ _ roug __ metres of permeable rock. There is little potential for leakage from the lake generally because of the low permeability of the basement rocks. (d) Dam and spillway Options ]i.. conventional the site. concrete-faced 1 .c' 1 ' rOC."C~l_...!... dam is proposed for Several spillway options have been examined in detail, The feasibility studies (Transport and vlorks! 1979) proposed that a saddle south-east of the Telegraph Station would be deegened to provide the primary spillway. Subse~uently this alternative (?~) was rejected in favour of a cheaper alterr_ative (3) which involved the use of the saddle immediately east of the dam as the primary spillway. Subsecuent review sho\vec. that' although Alternative A is more expensive, it achieves significantly greater flood mitigation and better cost/benefit ratio. Further details are providec in Verhoeve~, 1983. The c~rrent proposal involves Alternative A~ (e) Cost Verhoeven (1983) estimated the cost of the Telegraph Station dam, together with all access and associated works, to be $9.5 l':. This was based on detailed cost estimates compiled in 1981 f ''lith an additional allow-ance for inflation. ~ It should, hmvever, be noted that Verhoeven also estimated the present worth of flood mitigation which would be derived from the dam to be $17.5 /<1, and the net value of the proposed irrigation draft to be $1.1 M. This means that the dam would prov~ae a ~et-~benefit of $9.1 N in oresent \'lorth terms, not including any benefit derived from recreation or tourism. 11 : Al<LlYS
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