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 13 of 64. any lowering of the water table will be beneficial, in that the River Red Gums will be less waterlogged; there would be fewer surface pools (these are a health risk) in the watercourses; soil salinity problems due to capillary rise would be reduced; and further salt cOD.centration bv evapotranspiration would be reduced. In the event that a draft of one million kilolitres per annum is taken for irrigation of parks, less salt ,.;ill be imported to the Basin than would be the case with irrigation using Mereenie ;;qater I providing of course that the average salinity is lower thaI1_ that of i:lereenie water 1 as expected. In view of the existing and deteriorating situation with the Basin, the above effects can only be seen as ber..eficial. However , it is likely that the extent of this benefit i,-lill be small. With regard to the groundwater of the Farm Basin and areas further south, the feasibility report concluded that the effects of the dam would be negligib=-e. The vie'..; is believed to be sound, for the reasons stated in sections 4.06.2 and 4.06.3 of that report. Downstream Scour While it has been recognised that there would be signl=lcan~ scour potential irr~ediately downstrefuu of the spillwaysr this can be ameliorated by appropriate cesign of outlet structures and protection works. with regard to scour further downstream, the hydrology studies (Transport and Works, 19(9) concluded that the majority of scour would be very localised - within 100 metres of the spillway for a 1 in 10 vear flood. Some general degradation would occur in the river section bet"een the spilhlay and the <::onfluence with the Charles River. Degradation of the river bed dOw"TIstream cf 11111s Terrace was expected to be negligible. Any small bed load deficit would be compensated in large floods by sediment from the Charles River. The above conclusions were subsequently supported results of the hydraulic model studies (SV,EC, 1981) showed that significant scour tdould on Iv occur i~llediate vicinity of the spillway outfall points. (j) Sacred S ices by the , in itlhich the The existence of sacred sites within the proposed impoundment is acknowledged. 11: ~.NDYS
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