Executive summary .......................................................... iii
Table of contents
1
Project Background ................................................ 1
1.1
Introduction................................................................................ 1
1.2
Site description.......................................................................... 1
1.3
TSF characteristics ................................................................... 2
1.4
Receiving environment ............................................................. 2
2
Dam failure overview............................................... 5
2.1
Dam failure mechanisms .......................................................... 5
2.2
Sunny day and flood day scenarios ........................................ 6
2.3
Breach locations........................................................................ 6
2.4
Flow behaviour .......................................................................... 6
2.5
Flood severity classification .................................................... 7
2.6
Downstream modelling extents ............................................... 8
3
Failure scenarios ..................................................... 9
3.1
Failure mechanisms .................................................................. 9
3.2
Failure location .......................................................................... 9
3.3
Background flood .................................................................... 11
3.4
Initial conditions ...................................................................... 11
3.5
Overview of considered failure scenarios ............................ 11
4
Dam break characterisation ................................. 12
4.1
Outflow volumes...................................................................... 12
4.2
Dam Break parameters ........................................................... 16
4.3
Outflow hydrographs .............................................................. 17
5
Hydraulic modelling .............................................. 20
5.1
Modelling Approach and Inputs............................................. 20
5.2
Hydraulic modelling results ................................................... 20
5.2.1 5.2.2
Inundation mapping ..............................................................................20 Summary of simulation results..............................................................21
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