Tableof contents
Executive summary .......................................................... iii
1 Project Background ................................................ 1 1.1 Introduction............................................................................. 1 1.2 Site description ....................................................................... 1 1.3 TSF characteristics ................................................................. 2 1.4 Receiving environment........................................................... 3 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 ..................................................................... 10 3.3 Background flood ................................................................. 12 3.4 Initial conditions ................................................................... 12 3.5 Overview of considered failure scenarios ........................... 12 4 Dam break characterisation ................................. 14 4.1 Outflow volumes ................................................................... 14 4.2 Dam break parameters.......................................................... 18 4.3 Outflow hydrographs............................................................ 19 5 Hydraulic modelling .............................................. 21 5.1 Hydraulic modelling results ................................................. 21 5.1.1 Inundation mapping...........................................................................21 5.1.2 Summary of simulation results...........................................................22 6 Consequence Category assessment................... 23 6.1 Method Overview .................................................................. 23 6.1.1 ANCOLD guidelines ..........................................................................23
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