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The results of the case study were analysed by comparing them against ANCOLD criteria as illustrated in Table 1. The comparison in Table 1 demonstrates that many hazardous private reservoirs with inadequate spillway capacities do exist in the Mount Lofty Ranges of South Australia. These disturbing results together with two later follow-up studies displaying similar results (see Pisaniello & McKay 2005; Tingey-Holyoak et al. 2013) demonstrate that owners are not taking action in terms of analysis and upgrading of their structures and that the need for a dam safety assurance policy in South Australia is urgent. The results presented in Table 1 also provided a foundation for developing regionalised flood capability prediction relationships as follows.

Table 1

Comparison of flood capability results with ANCOLD (1986, and as per 2000 update) guidelines for Pisaniello et al. (1999) study in South Australia

Dam no.Minimum hazard ratingIFF 1/AEPANCOLD guidelines IFF range 1/AEPAcceptable under ANCOLD guidelines?
(high/sig.)(years)(years)(Yes/No)
High 40 PMF-10,000 No 
High 80 PMF-10,000 No 
High 97 PMF-10,000 No 
High 150 PMF-10,000 No 
High 320 PMF-10,000 No 
High 2,750 PMF-10,000 No 
Sig. 190 10,000–1,000 No 
Sig. 130 10,000–1,000 No 
Sig. 280 10,000–1,000 No 
10 Sig. 500 10,000–1,000 No 
11 Sig. 1,400 10,000–1,000 Yes 
Dam no.Minimum hazard ratingIFF 1/AEPANCOLD guidelines IFF range 1/AEPAcceptable under ANCOLD guidelines?
(high/sig.)(years)(years)(Yes/No)
High 40 PMF-10,000 No 
High 80 PMF-10,000 No 
High 97 PMF-10,000 No 
High 150 PMF-10,000 No 
High 320 PMF-10,000 No 
High 2,750 PMF-10,000 No 
Sig. 190 10,000–1,000 No 
Sig. 130 10,000–1,000 No 
Sig. 280 10,000–1,000 No 
10 Sig. 500 10,000–1,000 No 
11 Sig. 1,400 10,000–1,000 Yes 

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