Table 2.7.7 Summary of dryland salinity assessment. NA = Not assessed; * = From Land Monitor areas of consistently low productivity (AOCLP 1998); = From Land Monitor average height above valley floor (AHAVF) 0–2 m, except Hydrozone 24 0-1 m and Hydrozone 25 † m; = from Resource management technical report 388 (Raper et al. 2013); § = from Salinity Investment Framework Phase 1 (George et ‡ al. 2005) Proportion Timing Risk of Comments of zone of zone of salinity within salinity§ affected valley in 1998* hazard† % trend % 1 Kalbarri 0 NA variable medium possible moderate moderate Rising, falling and stable Sandplain term groundwater trends are found throughout. Rising trends are observed where groundwater is less than 15 m deep, and falling and stable trends where groundwater is deep (> 15 m). The salinity risk is moderate because of the extensive areas of flat plains. 2 Northampton NA 17 mostly term unlikely minor low Prior to 2000, this hydrozone rising appeared to be in hydrological equilibrium with stable groundwater trends. From 2000 to 2007, drought led to significant groundwater falls. Since 2007, groundwater levels have been rising but generally remain below pre-2000 levels. The salinity risk is low because expanding salinity is unlikely and any consequences minor because of the incised topography restricting the extent of salinity.
Table 2.7.7 Summary of dryland salinity assessment. NA = Not assessed; * = From Land Monitor areas of consistently low productivity (AOCLP 1998); † = From Land Monitor average height above valley floor (AHAVF) 0–2 m, except Hydrozone 24 0-1 m and Hydrozone 25 m; ‡ = from Resource management technical report 388 (Raper et al. 2013); § = from Salinity Investment Framework Phase 1 (George et al. 2005) of zone in 1998* % Proportion of zone within valley hazard† % trend Timing of salinity§ Risk of salinity Comments 1 Kalbarri Sandplain 0 NA variable medium term possible moderate moderate Rising, falling and stable groundwater trends are found throughout. Rising trends are observed where groundwater is less than 15 m deep, and falling and stable trends where groundwater is deep (> 15 m). The salinity risk is moderate because of the extensive areas of flat plains. 2 Northampton NA 17 mostly rising term unlikely minor low Prior to 2000, this hydrozone appeared to be in hydrological equilibrium with stable groundwater trends. From 2000 to 2007, drought led to significant groundwater falls. Since 2007, groundwater levels have been rising but generally remain below pre-2000 levels. The salinity risk is low because expanding salinity is unlikely and any consequences minor because of the incised topography restricting the extent of salinity. affected
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