Management of Salt
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The CAT incorporates many tools and models. One of these is the 2CSalt model, developed within the former CRC for Catchment Hydrology in conjunction with the MDBC.
Current salinity management planning across Eastern Australia is focussed on meeting end-of-catchment salinity targets. Intervention techniques such as targeted landuse change can impact streamflow and salt loads. Our modelling effort allows the prediction of these impacts on end-of-catchment streamflow and salt export. In addition, it can be used to identify priority areas and determine where salt is stored in the landscape and how much is mobilised by groundwater discharge, surface runoff and subsurface flow.
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Scenario descriptions
Biodiversity: Trees planted for biodiversity outcomes.
Break of Slope (BOS): Trees planted as buffer at interface between hillslope and alluvial areas.
Upland Break of Slope: Trees planted as for BOS, in upland areas only.
Upland Alluvial: Trees planted in all upland alluvial areas.
Total change after 26 years in stream flow and salt export.
| Current Practice | Upland Alluvial | BOS | Biodiversity | Upland BOS | |
|---|---|---|---|---|---|
| Total stream flow (ML) | 951,899 | 870,437 | 871,675 | 703,325 | 825,045 |
| Total Salt Load (T) | 575,778 | 525,866 | 531,779 | 415,083 | 503,488 |
| Reduction in stream (ML) | 81,461 | 80,224 | 248,574 | 126,854 | |
| Reduction in Salt (T) | 49,913 | 43,999 | 160,695 | 72,291 | |
| Increase in treed area (ha) | 3,970 | 5,746 | 16,652 | 5,115 | |
| Total treed area (ha) | 10,353 | 14,323 | 16,099 | 27,005 | 15,468 |
| Decrease in stream flow (ML/ha trees) | 21 | 14 | 15 | 25 | |
| Decrease in salt load (T/ha trees) | 13 | 8 | 10 | 14 |
