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Inquiry into the Alice Springs Recreation Lake : submission by Department of Transport and Works



Inquiry into the Alice Springs Recreation Lake : submission by Department of Transport and Works


Marquardt, A.


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.



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Dept. of Transport and Works

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Report ; 1/1983

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Check within Publication or with content Publisher.

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Technical Report WRD83001 Viewed at 14:07:22 on 29/07/2010 Page 12 of 64. e :n </ c e g o ,e ,e n ,y )d :e m (i) Downstream effects This subject '\>1as covered in the feasibility report (Transport and Works, 1979) and in the Environmental Review (Dames and Moore, 1980). However, several of the submissions received have dis?layed considerable confusion on some points. The key aspects are summarised as follows: Downstream Flow Although some 40% of individual flows in the Todd River would be entirely cor-tained by the lake, on average the reductions in downstream flow volume ar..d duration are ?redicted to be only 20% and 30% respectively, and this does not allow for the unaffected input of flows from the Charles River. The above figures are not to be confused with the ?rediction that flooding would be significantly attenuated. ~1'ater Leve 1 s and Salinity For some years there has been a con;:J.nuing problem of high groundt0,7ater levels and increasing salinity in the Alice Springs Town Basin. (These factors are cormnonly believed to be contributing to the deterioration of the River Red Gums.) .... ,.' , ;."',':This state of affairs has been brought about by the ;~~Sb.~~~sation of existing soil salts due to the expansion of , :urban areas ar_d by the importation of salt in the water from the Mereenie aquifer. The process has been by several very wet years during the mid 1970's, and o'--"<-ilisation of the groundwater for watering parks i'~~i~I~~~~~;;'r~ Regardless of efforts to increase the n sation, however, the salinitv will continue to rise due ''l-:Lcio~;t~:' importatio'n I to a degree ~t which the groundwater is ,c ' .. totally unusable throu<:;hout. Indeed the long-te.L"l ~~~~'~-;~~.~;~~to eXDort saline groundwater to an outside area is" :.~ . . under consideration, in conj unction "\'li th studies on 45 1 - '- t - "-1' ~ posa_ or ~rea eo sewage e~r_uen;:. ~~l~1tt.effect 0" the d ~ _ am on low"!:- the Basin has been assessed reduction in recharge to the Basin would be about ~~,~,.~s would tend to result in a slightly (but possibly ~;:<.,t'_C).l:, significantly) lower water table than would otherwise

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