Territory Stories

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

File type



Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



Parent handle


Citation address


Page content

Technical Report WRD79012 Viewed at 00:02:46 on 18/02/2010 Page 24 of 153. I I I I I I I I I I I I I I I I I I I I 13 A log-Pearson Type rrr distribution was fitted to the data for cases (a), (b) and (c). Low flows were treated in accordance with the recommendation in "Australian Rainfall and Runoff" section 9.2.9. The distribution from case (b) \I,~as selected as being a suitable representation of the flood frequency although the di.fference bet'''een (a) and (b) is small and both distributions well within the confidence limits of each other. The adopted flood frequency curve for G.S. 006046 is shown in Figu.!'e 46 At G.S. 006009, maximum gauge heights for all the water years 1952/53 to 1977/78 are known and it has been possible to reliably estimate the peak annual discharges. (see Table 6). A log-Pearson Type III distribution was fitted to the data using the technique outlin~ in "Australian Rainfall an"d Runoff ll section 9.2.9 (see Figure 5),. At G.S. 006126 only the water years 1965/66, 1974/75 and 1975/76 have complete records though the maximum gauge heights are known fer all years since 1960/61 except 1976/77 (see Table 6). The very small peak discharge for 1976/77 was estimated from G.S. 006046 and G.S. 006009. Again a 1,og-Pearson Type III distribution was fitted to the data (Figure 6) using the same techniques as above. The small number of records and the large number of low discharges result in the confidence limits for the G.S. 006126 annual flood frequency distribution being very large, especially when compared with the confidence limits obtained for G.S. 006046 and G.S. 006009. A comparisen of confidence limits for the 100 year return period flood is shown in Table 5. Table 5 CONFIDENCE LIMITS FOR 100 YEAR RETURN PERIOD FLOOD 5% Limit (m 3 /s ) value (m 3 /s) G.S. 006046 2300 1040 720 G.S. 006009 1800 890 (,20 G.S. 006126 3800 1120 660 Table 5 also demonstrates that even at a fairly high return period the adopted peak discharge at G.S. 006009 is smaller than that at G.S. 006046 and G.S. 006126.

Aboriginal and Torres Strait Islander people are advised that this website may contain the names, voices and images of people who have died, as well as other culturally sensitive content. Please be aware that some collection items may use outdated phrases or words which reflect the attitude of the creator at the time, and are now considered offensive.

We use temporary cookies on this site to provide functionality.
By continuing to use this site without changing your settings, you consent to our use of cookies.