Table 1 Summary of a GIS-based analysis of irrigation areas and coastal elevation, after Werner et al. (2008). irrigation area Area at 0–5 mAHD Area at 0–10 mAHD State Major Land-use (ha) (ha) (ha) NSW 867 516 Cropping 7663 10 198 NT 29 899 Tree fruits 136 402 Qld 1 080 787 Sugar cane 15 706 84 749 SA 271 319 Sown grasses 9481 16 839 TAS 128 795 Cropping 2922 6837 Vic 837 886 Modified pasture 9624 23 018 WA 55 789 Vine fruits 528 2814 Total 3 271 991 Cropping 46 060 144 858 Figure 5 Irrigation areas vulnerable to SWI based on the lowest minimum groundwater level (m AHD) recorded for each bore. Note: data not available for the Northern Territory (after Nation et al., 2008). A summary of Australian sites where the threat of SWI has been recognised is shown below in Figure 6 and also listed in Table 2. Further details on these areas follows in Chapter 3.2. Figure 6 Locations where the threat of SWI has been identified. Table 2 Distribution of previous Australian studies that identify the threat of SWI. SWI Incidence Degree of SWI Location SWI Monitoring Reported assessment1 South Australia Yes, but not SWI interface Eyre Peninsula Yes Moderate specific Yes, but not SWI interface Le Fevre Peninsula (Adelaide) Yes Low specific Yes, but not SWI interface Adelaide Metropolitan Yes Moderate specific Port MacDonnell No No Moderate Yes, but not SWI interface Willunga, SA Yes Low specific Victoria Yes, but not SWI interface Werribee Yes Moderate specific Gippsland (Sale and Orbost regions) No No None to Very Low Point Nepean* No No Low Koowerup* No No None to Very Low Moorabbin* No No None to Very Low
Table 1 Summary of a GIS-based analysis of irrigation areas and coastal elevation, after Werner et al. (2008). State irrigation area (ha) Major Land-use Area at 0–5 mAHD (ha) Area at 0–10 mAHD (ha) NSW 867 516 Cropping 7663 10 198 NT 29 899 Tree fruits 136 402 Qld 1 080 787 Sugar cane 15 706 84 749 SA 271 319 Sown grasses 9481 16 839 TAS 128 795 Cropping 2922 6837 Vic 837 886 Modified pasture 9624 23 018 WA 55 789 Vine fruits 528 2814 Total 3 271 991 Cropping 46 060 144 858 Figure 5 Irrigation areas vulnerable to SWI based on the lowest minimum groundwater level (m AHD) recorded for each bore. Note: data not available for the Northern Territory (after Nation et al., 2008). A summary of Australian sites where the threat of SWI has been recognised is shown below in Figure 6 and also listed in Table 2. Further details on these areas follows in Chapter 3.2. Figure 6 Locations where the threat of SWI has been identified. Table 2 Distribution of previous Australian studies that identify the threat of SWI. Location SWI Incidence Reported SWI Monitoring Degree of SWI assessment1 South Australia Eyre Peninsula Yes Yes, but not SWI interface specific Moderate Le Fevre Peninsula (Adelaide) Yes Yes, but not SWI interface specific Low Adelaide Metropolitan Yes Yes, but not SWI interface specific Moderate Port MacDonnell No No Moderate Willunga, SA Yes Yes, but not SWI interface specific Low Victoria Werribee Yes Yes, but not SWI interface specific Moderate Gippsland (Sale and Orbost regions) No No None to Very Low Point Nepean* No No Low Koowerup* No No None to Very Low Moorabbin* No No None to Very Low
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