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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







Publisher name

Northern Territory Government

Place of publication



Report no. 12/1979

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Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



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Technical Report WRD79012 Viewed at 00:02:46 on 18/02/2010 Page 96 of 153. I I I I I I I I I I I I I I I I I I 10 2. 3 .6 Discussion Figure 2 shows an example of monthly flows at the thr-ee stations on the Todd River. Flow volumes at G.S.006009 larger than at G.S. 006046; This would be expected for high return period floods because G.S. 006009 commands a larger catchment. However the Wills Terrace Station often has smaller volumes than the Wigley Gorge Station. This can be partly attributed to large losses in the Todd River at low flows. Similarly at G.S. 006126, flow volumes at this station are not always larger than at stations further upstream. 2.4 Evapo"-ation The Bureau of -Meteorology has operated a class A pan at the present Alice Springs Airport 15 km south of the township since 1955. The Water Resources Branch has operated three class A pans at other potential Recreational Damsites. Although the first of these was installed in September 1973, there are in total only forty months of evaporation records available. It can be expected that the damsite to the north of Alice Springs and the MacDonnell Ranges would have slightly lower class A pan evaporation than that measured hy the Bureau of Meteorology at the present airport. This is because the Range, and the hilly region north of the Range would protect the site from most dry winds. The three pans operated by the Department are in similar topography to the damsite. A correlation factor of 0.90 has been applied to the evaporation measured at the Alice Springs Airport to transform it to the damsite. This factor was arrived at after a comparison of the evaporation data collected by the Department and from the Alice Springs Airport. The expected class A monthly evaporation rates at the damsite are included in Table 4. Garrett and Hoy (1978) include monthly pan coefficients under various climatic conditions for lakes of various depths and sizes. The coefficients at Rifle Creek are often Reservoir in Queensland have been used as a basis for calculating the coefficients at Alice Springs. Table 3 shows some general information on the Rifle Creek Reservoir and the Alice Springs Dam.

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