Alice Springs recreational dam hydrology report project 6
Jackson, D.; Paige, D.
E-Publications; E-Books; PublicationNT; Report no. 12/1979
1979-10-01
Date:1979-10
English
Northern Territory Government
Darwin
Report no. 12/1979
application/pdf
Attribution International 4.0 (CC BY 4.0)
Northern Territory Government
https://creativecommons.org/licenses/by/4.0/
https://hdl.handle.net/10070/228346
https://hdl.handle.net/10070/674275
Technical Report WRD79012 Viewed at 00:02:46 on 18/02/2010 Page 123 of 153. I I I I I I I I I I I I I I I I I I I I 25 4.6 Other Results Of all the simulations performed (approximately forty five) the maximum duration of a period when the draft could not be met was 20 m~nths. This was for the historic flow case with a draft of 5Mm /year and at the lowest spillway level of 591 metres. This occured from April 1969 to November 1970. During this time there was no surface runofff. With a draft of 1Mm3/year or less, at spillway levels of 592.5 metres and 594 metres the draft was able to be met for the whole period of simUlation. For the hypothetical case of a complete drought, i.e. no rain or no runoff, at a draft 1 Mm 3/year and at a spillway level of 594 metres, it takes 27 months for the dam to empty. This is an extreme case and is not expected to occur. Table 10 shows the total number of failures found from the dam simulation. In this context failure is defined as a period of time when the draft could not be met. Table 10 TOTAL NUMBER OF FAILURES (Months) 3 Draft Mm /yr. 5 4 3 2 1 0.5 0 594 48 (22%) 35 ( 16 %) 22 (10'S) 6 3 %) 0 0%) 0 0%) 0 0%) Spillway Level (m) 592.5 591 61 (28%) 76 (35%) 55 (25 'Is) 60 (28 %) 32 (15%) 43 (20%) 13 ( 6%) 23 (11 % ) 0 ( 0%) 4 2%) 0 ( 0% ) 0 0%) 0 ( 0%) 0 0%) Note: 1. Probability of failure in brackets.