Distribution of Hydraulic Head in the Peace River / Viking / Bow Island Hydrostratigraphic Unit

This map depicts the distribution of hydraulic head in groundwater in the Peace River / Viking / Bow Island hydrostratigraphic unit (HSU). The map is a result of a simple kriging technique using representative hydraulic head values calculated from drillstem test pressures and static water level data from water wells.
 
The distribution of hydraulic head was mapped at a regional scale using many years of data, thus providing a good indication of regional hydraulic head within the unit rather than site-specific values. The uncertainty of prediction is depicted on an inset map, which shows the residual values (predicted value minus measured value) plotted at each location to indicate where underprediction and overprediction occurs compared to the calculated hydraulic head values. Two additional inset maps show the location of tests removed during the Cumulative Interference Index (CII) process, and the distribution of total dissolved solids. The geometry and variable thickness of the Peace River / Viking / Bow Island HSU are illustrated on schematic cross-sections, and the relationship between geological units is further described in an accompanying regional lithostratigraphic and hydrostratigraphic table.