Table 2.1
Vulnerability Thresholds Classification Limits of Flood Hazard Curves [10]
Hazard vulnerability classification
Depth velocity product (DV) (m 2 /s)
Limiting still water depth (m)
Limiting velocity (m/s)
Description of hazard classification
Generally safe for vehicles, people and buildings.
H1
0.3
0.3
2.0
H2
Unsafe for small vehicles.
0.6
0.5
2.0
Unsafe for vehicles, children and the elderly.
H3
0.6
1.2
2.0
H4
Unsafe for vehicles and people.
1.0
2.0
2.0
Unsafe for vehicles and people. All buildings vulnerable to structural damage. Some less robust buildings subject to failure. Unsafe for vehicles and people. All building types considered vulnerable to failure.
H5
4.0
4.0
4.0
H6
> 4.0
-
-
2.6 Downstream modelling extents
According to ANCOLD [2], the extents of a dam break model could be terminated when it is possible to demonstrate the following: — The flood event is contained within the bed and banks of the stream at the extremities of the model — The Consequence Category is unlikely to change with any extension of the model — Dam break effects are negligible — Travel time is long enough to allow reliable emergency procedures to be activated and enforced (at least 12 hours).
Project No PS213278 Sandstone Gully TSF Dam Break and Consequence Category Assessments Mount Morgan Gold Mine Heritage Minerals
WSP January 2025 Page 8
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