|
Total project area ( ha )
25,000
20,000
15,000
10,000
5,000
|
Erosion control ( ha ) |
GLM WW ( ha ) |
Grader Project ( ha ) |
Revegetation ( ha ) |
Streambank ( ha ) |
Gully ( ha ) |
Total Fine sediment ( tonnes ) |
|
7,000
6,000
5,000
4,000
3,000
2,000
1,000
|
Total Fine Sediment reduction ( tonnes ) |
-
Bogie |
Bowen |
Broken |
Glenmore |
|
|
|
Creek |
Figure 43 . Predicted fine sediment reductions and project areas for all projects completed in the LDC Project in the Bowen Broken Bogie sub-catchments .
Using this information when assessing relative outcomes in conjunction with estimates from the current Source Catchment model can identify ‘ hotspots ’ for fine sediment delivery and inform further investment . Table 15 shows the fine sediment , PP and PN yields for each sub-catchment in the BBB .
Fine sediment is also graphed in Figure 44 , which emphasises the high sediment generation rate from all sources in the Bowen River ( lower reaches ) and the Little Bowen River sub-catchments . This finding is also reflected by contributions to the end of catchment load for the Burdekin basin ( important for target reductions ; Table 16 ), which highlights that the BBB contributes 40 % of the fine sediment to the Burdekin end of catchment load and that the Bowen and the Little Bowen River are the largest contributors ( 9 % and 8 % respectively ).
Table 15 . BBB sub-catchment fine sediment , particulate nitrogen and phosphorus yields ( t / ha / y ) from the Source Catchments model estimates .
BBB sub-catchment
Fine Sediment ( t / ha / y )
Little Bowen
Particulate Nitrogen ( t / ha / y )
Pelican Creek Rosella Creek
Particulate Phosphorus ( t / ha / y )
Bogie River 0.54 0.6 0.3 Bowen River ( lower reaches ) 2.89 3.1 1.8 Broken River 0.52 1.5 0.7 Glenmore Creek 1.69 1.6 0.6 Little Bowen River 2.20 5.1 2.5 Pelican Creek 1.64 2.9 1.1 Rosella Creek 1.89 2.2 1.0 Total BBB 1.44 2.2 1.0
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102