The descriptors 1
|1.||Total: add up over all components;|
|2.||Highest Significant Score: give the highest score for which a significant portion of the problem would score (significant portion is defined as about 20 per cent);|
|3.||Weighted Average: take a weighted average over all components of the problem.|
This measures the spatial extent of a single release or event for which there is a significant change in the material levels in the environment. The quantitative scale is based on linear dimensions, whereas the categorical scale is on common geographical units (table 2.1A).