Table 4.4 Salinity risk assessments for hydrozones (numbers in parentheses relate to hydrozone numbers in Figure 4.1) % of zone within Land % of zone Monitor A O within Land Dominant Likelihood Timing of Hydrozone C L P in Monitor A H groundwater of future Consequence of future Salinity name & number 1996–98 A V F trend salinity future salinity salinity risk Comments Kalbarri Less than 1 the Land variable possible moderate medium moderate Variable groundwater Sandplain (1) Monitor term trends occur mapping throughout this product did hydrozone. Rising not produce trends occur where a reliable groundwater is less estimate for than 15m deep. this Falling and stable hydrozone trends occur where groundwater is deep (more than 15m). The salinity risk is moderate because of the extensive areas of flat plains. Northampton the Land 17 mostly rising unlikely minor short low Prior to 2000, this Block (2) Monitor hydrozone appeared mapping to be in hydrological product did equilibrium. In not produce drought led to a reliable significant estimate for groundwater decline. this Since 2007, hydrozone groundwater levels have been rising but generally remain below pre-2000 levels.
Table 4.4 Salinity risk assessments for hydrozones (numbers in parentheses relate to hydrozone numbers in Figure 4.1) Hydrozone name & number % of zone within Land Monitor A O C L P in 1996–98 % of zone within Land Monitor A H A V F Dominant groundwater trend Likelihood of future salinity Consequence of future salinity Timing of future salinity Salinity risk Comments Kalbarri Sandplain (1) Less than 1 the Land Monitor mapping product did not produce a reliable estimate for this hydrozone variable possible moderate medium term moderate Variable groundwater trends occur throughout this hydrozone. Rising trends occur where groundwater is less than 15m deep. Falling and stable trends occur where groundwater is deep (more than 15m). The salinity risk is moderate because of the extensive areas of flat plains. Northampton Block (2) the Land Monitor mapping product did not produce a reliable estimate for this hydrozone 17 mostly rising unlikely minor short low Prior to 2000, this hydrozone appeared to be in hydrological equilibrium. In drought led to significant groundwater decline. Since 2007, groundwater levels have been rising but generally remain below pre-2000 levels.