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 23 of 153. I I I I I I I I I I I I I I I I I I I I 12 3 ANALYSIS OF DATA 3.1 General This section discusses the analysis of the hydrographic data to determine flood frequency, unitgraphs and maximum probable floods, and also the generation of stream flow sequences. 3.2 Flood Frequency At G.S. 006046 peak annual gauge heights are known for years 1960/61 to 1977/78 except for 1975/76. The peak water year floods and gauge heights are included in Table 6. The peak flood in 1975/76 was in early February, but ~here are no records from 6/2/76 to 16/2/76. Three approaches were used to analyse records from G.S. 006046. These were: Case (a) IgnorQ the 1975/76 water year and analyse 17 years of records. Case (b) Assume the peak disclldrgc at G.S. 006046 in 1975/7& is of the same order of magnitude as th~t at C.S. 006009 in the same year. Case {e) Estimale a peak discharge for 1975/76 by using a rainfall - peak discharge correlation. This correlation used maximum daily rainfall from both Alice Springs Post Offlce# and Bond Springs. Ranked peak discharges at Wigley Gorge and ranked maximum daily rainfalls were plotted at points of equal probability. Close examination indicated that storms in tIle Todd River catchment are often isolated thU!lderstorms. This is thought to indicate that a rainfall event of a particular return period need not necessar~ly be associated with a stream flow of the same return period. Correlation between ranked rainfall and runoff at G.S. 006046 resulted in a correlation of 0.92 for Alice Springs rainfall data and 0.88 [or Bond Springs rainfall data. Using rainfall data from 1975/76 the peak discharge at G.S. 006046 in that year was estimated tc be 650 m'/s. This is considered to be excessively high especially when compared with the peak discharge at G.S. 006009 and G.S. OC6126 (see Table 6). Correlation with the actual storm also overestimated the peak discharge.

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.