Table 3.2
Summary of considered failure scenarios
Initial water elevation (1)
Downstream weather condition Sunny day (no concurrent rainfall) Sunny day (no concurrent rainfall)
Scenario
Embankment
Failure mechanism
1
Stage 1
Piping
RL 295.6 m
2
Stage 3
Piping
RL 310.7 m
3 Sunny day (no concurrent rainfall) (1) The initial water elevation was defined as the operational level plus the 120-hour PMP storm volume containment for Stages 1 and 3, and at the spillway invert for Stage 5. Stage 5 Piping RL 328.5 m
Project No PS213278 Sandstone Gully TSF Dam Break and Consequence Category Assessments Mount Morgan Gold Mine Heritage Minerals
WSP January 2025 Page 13
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