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Tennant Creek Water Supply 1979-1980, Source Investigation.[kelly well]



Tennant Creek Water Supply 1979-1980, Source Investigation.[kelly well]


Verhoeven, T. J.; Russell, P. W.


E-Publications; E-Books; PublicationNT; Report ; 27/1981




Made available via the Publications (Legal Deposit) Act 2004 (NT).





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Dept. of Transport and Works

Place of publication

Alice Springs


Report ; 27/1981

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Technical Report WRD81027 Viewed at 14:07:49 on 29/07/2010 Page 45 of 65. The simplest relationship having a reasonable straight line fit was the log-log (two year moving average rainfall). This relationship has physical justification, as examination of rainfall and bore water levels shows that recharge is influenced by antecedent raiy.fall. vmen fitted to 10 years of data (1968/69 to 1977/78) by least squares regression the relationship is defined by. . ......... (A6) Rearranging equation (A6) and substituting into equation (A5) gives the final Iola.ter bala.."r1ce eqtation: (3 Oh (- (Pn + Pn-l)) - 18) 10 . . .LOg 2 - ? where each term or function has units of and precipitation P is in mil1imetres. .. (A 7) EX A V = 0 -n L.l n thousand cubic metres (megali tres) Full storage volume is 48 million cubic metres, recorded in 1979 when 1~"'a.ter levels were at their highest following a n-illTIber of years of high rainfall. The aquifer was not in the full volume state at the cODmencement of ~umping. Historic and modelled aquifer behaviour fo:r the 10 years ('to 1977/78) used to calibrate the model and following two years used to verify the model are plotted in Figure 14. The model adequately represents the aquifer system in the follow'ing instances: (i) small a.'1l1ual changes in volume are modelled ",ell. (ii) the direction of volume cha..'1ge is anticipated by the model. Large volume changes are poorly modelled, the difference between Listoric ~~d modelled volumes is as ~uch as 8%. Such differences can be expected for large changes in variables while such a simplified model is used. Improved aqui~eT simulation C~~ only be obtained by using a more complex model ~~d co~puter simulation techniques. The model "..ras used to nredict storage behaviour for the twenty years from. 1979/80 to 1998/90. E~timation of total demand is outlined in Section 5.1. It is assumed that the a.J1 ..... ~ ... J.ual u..."'lderflo~rT of 183 thousand cubic metres in the Cabbage Gum borefield will be fully utilised. The predicted annual extractions from the Kelly Well-Kelly Well Hest bo:refields (EX in equation (A7)) are thus given by total demand (Table 5) minus 183 thousandncubic metres. F~om the 106 years of recorded rainfall a numbe~ of twenty year se~uences were selected for use in the predictive stage of the model. Rain~all se~uences included: (i) (ii ) T~Tenty years of the lower ten percentile rainfall value (210lillll). The period 1960 to 1979 which includes a period of drou&~t followed by years with the highest rainfall on record. Twenty years of' the :!lean rainf'all Val'-le (370=). The period 1921 to 1940. The period 1881 to 1900.

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