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Alice Springs recreational dam hydrology report project 6



Alice Springs recreational dam hydrology report project 6


Jackson, D.; Paige, D.


E-Publications; E-Books; PublicationNT; Report no. 12/1979







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Northern Territory Government

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Report no. 12/1979

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Attribution International 4.0 (CC BY 4.0)

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Northern Territory Government



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Technical Report WRD79012 Viewed at 00:02:46 on 18/02/2010 Page 112 of 153. I I I I I I I I I I I I I I I I I I I I 19 Rather than fit a line of best fit through the points, as was done for the synthetic flows (see. section 3.6) the points plotted were joined directly_ Figures 9, and 10 show the points used. Bond Springs rainfall points are not shown in these Figures. Thus 'Complete Records' were available at Wigley Gorge and Wills Terrace and the average of these flow volumes for each month was used as the historic flow record at the Damsite. 3.6 Synthetic Streamflow Generation. A rainfall runoff correlation was found. Using the 105 years of monthly rainfall records at the Telegraph Station and Alice Springs Post Office, this correlation was used to generate 105 years of monthly syntnetic stream flow. Using the Kolmogorov - Smirnov test, Spiegel (1965), it may be concluded that the rainfall records at the Telegraph Station (1874 - 1931) are from the same population as the rainfall records at the Post Office (1932 - 1972). Bond Springs rainfall records are also from the same population. The rainfall records at the Post Office and the Telegraph Station can therefore be used to extend the records. Monthly rainfalls at Alice Springs Post Office and monthly runoff volumes at G.S. 006046 and G.S. 006009 over corresponding periods were ranked and points of equal probability were plotted. At first this correlation was attempted on a month by month basis but due to lack of sufficient data and the large number of zeros in the record (40% to 70%) it is impossible to find a definite trend. The method was then done on a seasonal basis. Two "seasons" were chosen: October to March and April to September. Using these two seasons, separate curves for Wigley Gorge and Wills Terrace were derived. The curves were extrapolated to get higher flow than recorded. This was done by firstly extending the frequency curves of monthly rainfall and monthly flow volumes.