3 |
|
|
|
|
Fine sediment ( t / ha / yr )
2.5
2
1.5
1
0.5
|
|
|
|
0 |
Bogie River |
Bowen River |
Broken River |
Glenmore Creek |
Little Bowen |
|
|
|
|
River |
|
Pelican Creek |
Rosella Creek |
Figure 44 . BBB sub-catchment fine sediment ( t / ha / y ) from the Source Catchments model estimates . The red line shows the rate for the whole BBB catchment ( 1.44t / ha / yr ) for comparison .
Table 16 . BBB sub-catchment contributions (%) to regional fine sediment , particulate nitrogen and phosphorus export ( at Burdekin end of catchment ) from the Source Catchments model estimates .
BBB sub-catchment
Fine Sediment (%)
Particulate Nitrogen (%)
Particulate Phosphorus (%)
Bogie River 3 3 3 Bowen River ( lower reaches ) 9 8 8 Broken River 3 6 7 Glenmore Creek 6 3 5 Little Bowen River 8 13 15 Pelican Creek 6 7 10 Rosella Creek 5 4 5 Total BBB 40 44 53
Figure 45 shows the fine sediment contributions for each BBB sub-catchment by erosion type . This highlights the ( well established ) high contribution of gully erosion overall , but also the potential importance of streambank erosion in the Bowen sub-catchment . Figure 46 confirms all previous understanding that grazing remains the priority contributing land use . It should be noted that streambank erosion activities were not specifically targeted in the LDC Project , and any works were opportunistic with landholders participating in other activities .
103