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To assign weightings to each of these assumptions, an expert group consultation was held and the following expert judgement weightings were agreed (Table 3).

Table 3

Overlay method weightings

FactorClass and class weight
LayerParameterweight1234
Geomorphology 0.3 Flat low lying grabens Gentle to flat horst Gentle to steep horst Steep and mountainous 
50 30 15 
Drainage/drainage density 0.25 High Moderate   
70 30   
Hydrogeology/permeability 0.23 High Low to moderate Aquiclude  
60 35  
Structure/structural density 0.22 Major (regional) Moderate Local Poor 
55 25 15 
  Total 58.4 30.05 8.95 2.6 
  Classification   High Moderate Low to moderate Low 
FactorClass and class weight
LayerParameterweight1234
Geomorphology 0.3 Flat low lying grabens Gentle to flat horst Gentle to steep horst Steep and mountainous 
50 30 15 
Drainage/drainage density 0.25 High Moderate   
70 30   
Hydrogeology/permeability 0.23 High Low to moderate Aquiclude  
60 35  
Structure/structural density 0.22 Major (regional) Moderate Local Poor 
55 25 15 
  Total 58.4 30.05 8.95 2.6 
  Classification   High Moderate Low to moderate Low 

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