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As a starting point, the study developed a finalised prediction relationship for only the North-West Region (Figure 2). This was undertaken by establishing an additional four study catchments in this region (i.e. six in total with the preliminary two catchments re-used) as detailed in Table 3. Then repeating the above method, over 150 hypothetical dam cases were created in total on the six study catchments in this region representing all the possible combinations of reservoir size and spillway capacity to pass the entire range of AEP design floods up to the PMP. Flood capability studies were again undertaken for each case generating a full range of DCF outcomes.

Table 3

Summary of Tasmanian North-West Basalt Region study catchments (well spread from left to right of region, see Figure 2)

Catchment no.Catchment nameLocation in North-West Basalt RegionCatchment area (km2)
Ghost Creek Far left 4.1 
Wilson's Creek Central left 1.2 
Sisters Creek Central 15.2 
Port Creek Central 5.5 
Claytons River Central right 25.0 
Yaxleys River Far right 2.7 
Catchment no.Catchment nameLocation in North-West Basalt RegionCatchment area (km2)
Ghost Creek Far left 4.1 
Wilson's Creek Central left 1.2 
Sisters Creek Central 15.2 
Port Creek Central 5.5 
Claytons River Central right 25.0 
Yaxleys River Far right 2.7 

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