Description
Criteria
Unit Basis Value
Source
1:100 AEP 3 month wet season rainfall depth
Wet season water storage allowance
mm 1,260
[10]
120 hr Probable Maximum Precipitation
Design Flood Event
mm 2,620
[11]
1:1,000 AEP 72 hr storm
Extreme storm storage
mm 1,020
[12]
Minimum decant pond depth
-
m No allowance at this stage
-
Figure 2.1
Mount Morgan spoil dump locations and haul routes
Project No PS213278 Upper Mundic Gully - Tailings Management Plan Mount Morgan Gold Mine Heritage Minerals
WSP March 2026 Page 6
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