Alice Springs Water Supply: Future Demand and Storage. (File 74/2995)
White, A. J.
E-Publications; E-Books; PublicationNT; Report no. 10/1974
Northern Territory Government
Report no. 10/1974
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
Technical Report WRA74010 Viewed at 05:02:43 on 18/02/2010 Page 49 of 68. I" ' '. - --.' .-~. ,- . _. ,- ~~.-L' 5. The Mereenie aquifer is characterised by a high permeability zone in the immediate vicinity of the prese'nt well"field. Outside this zone the permeahiIi ty is much lOh'er and provides a. tra'1smissivity. of ol'..ly 35Om2jday. The gradients :::tecess"-.'".)T to permit flows of ,the'desired order dictate that considerable pumping depths will be required. Presump.bly increasing pumping depth will place an economic limit on the usefulness of a~y onebore field. Comparison of costs on continued deep pumping with costs of establishing a new field will be necessary. ti '-'. from the Director of Housing , and Paragraph 3 of the memorandum Construction :puts the depth at Hhich pumps will be set at 150 metres. I 6. We should seek cl22~irication of t1lhat is to be regarded. as the lind t on pumping depth. Doubtless this ;"ill be controlled by the cost of establishing a~ alternative bore field. A possible site for an alt~-ative field is discussed in Paragraph 9. 7. Accepting 150 metres as the limit IO~ purposes of discussion, ani alloidn6 that individual bores will operate up to 10 metres below the general level "Ii thin the fi eld, if the field is to operate unti,l ye.ar 2000 the limit on available draft is 300. HI per week . ",., .. ": " .' ,: l; .~, "_, (.,.,,, l'w~~;J:;!";~iC\.::: A draft 01'."300 m!i>leek is equiva.lent to the consumption of a popUlation of 36,000 with a per capita requirement of 1.2 kl!day. 8. Alice Springs population extr"polatiol1s -prepared 'by: the Department of the N.T'e exhibit a virtual eXDo~entia.l increaSe 'until 1985 after \,:hich the ~ate of increa.se is exPected to decline,~.slightly. Using these figu~es a nODulation of 36,000 is exo8cted in 1984. " > ~ '''".' "-'- . ", . 9. "\,,: On this ba.sis 2. second. punrp5.ng fie"i"d~~lJ. be reo.uired. to be in operat\op by 1984, only 10 years from no". >'>" :. '\ T~" establish a second fi(::ld. requires that another zone o:f f>.igh permeabrli ty be found Hi thin' the genra,ll;~r moc.erc:d~e perme2.bili ty. of the aqui fer:~ , The area. shm1in& best prospects is in the Todd. Floodout' Area to the east 'of the Alice Springs ~lirport,~j~' ''''. . . of the At present"--',pumping is from a field approximately airport~ The are?- unicr consideration is S02;,2: 10 km 6 m west east cf ..l.}: .l. A .I.. ro ,.,., , '1'~ J. ~. . l.-.!e a.:!.rpor..... A.part.. .!.ro-m 't e. Dlcner perr:18D.Dl_.ll.-Y expeCl..ec. "to eXlSt, as a cO:1sequeTIce of faul ti!Jg in the area., -the proposed field wvuld be ad v8..s'1tageously placed to attract recha2:'ge from floKS i!l "'"the j[odd River. Salini ty of ihe Hats::: shoul(l be cOlnuaJ:'ablG vIi ih that of th-e present_ field. The two .fie-lds r,.rould, be sUI~ficient:J.y a.part to avoid si':''nificant intt-erference' even if' direct 'interco!"'illection should be proved. , _""r :.:' ,~ .. /3 /3/ (1 \ -. ". '> I I I I , I I !
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