A fundamental underpinning of the LMwC scheme is the recently developed LSC system, which identifies the physical capability of the land; therefore, a brief overview of this system is provided below, followed by a description of the LMwC scheme itself.
Following the derivation of land and soil capability data, it is then possible to apply land management data to determine the extent of LMwC.
The LMwC scheme involves a comparison of the estimated impact of current land-management actions against the physical capability of the land and soil (LSC) to derive LMwC indices.
The 1-5 LMwC index is calculated for each hazard by considering the results from the above comparison, and applying the mies given in the lower part of Fig.
Derive LMwC indices for site, monitoring units, catchments and beyond
The LMwC indices for each hazard at a site are averaged to give the overall LMwC index for that site (step 7).
Application of the LMwC scheme provides useful land-management information at the SMU, regional catchment and state levels.
The following case study compares two monitoring sites within the 2008-09 NSW MER program to illustrate the derivation of the LMwC indices.
2, it can be seen that the LMwC index for sheet erosion at site 1 is 3 (low risk of degradation) whereas under site 2 it is 1 (very high risk of degradation).
A similar process to that outlined above is carried out for the other hazards and then averaged to give the LMwC index for the site under the two management regimes, with results as presented in Table 5.
Sites in the SMU are averaged to give combined and most limiting LMwC indices for the SMU, the CMA and ultimately all NSW.
3 presents the LMwC index for each hazard by each SMU, with averages for each hazard given at the base and averages for each SMU given on the right-hand side.