Alice Springs recreational dam hydrology report project 6
Jackson, D.; Paige, D.
E-Publications; E-Books; PublicationNT; Report no. 12/1979
Northern Territory Government
Report no. 12/1979
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
Technical Report WRD79012 Viewed at 00:02:46 on 18/02/2010 Page 19 of 153. I I 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 three stations on the Todd River. Flow volumes at G.S.006009 are often 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 1 flew volumes at this station are not always larger than at stations further upstream. 2.4 Evaporation 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 Darosites. 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 by 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 roost 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 includd in Table 4. Garrett and Hoy (1978) under various climatic depths and sizes. The include monthly pan coefficients conditions for lakes of various coefficients at Rifle Creek Reservoir in Queensland have been used as a basis for calculating the coefficients at Alice Springs. Table 3 shows som? general information on the Rifle Creek Reservoir and the Alice Springs Dam.
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