Categorisation of results to enhance interpretation 

To aid interpretation of the water quality results, the parameters measured are scored against qualitative measure of the extent outside Guidelines (applicable values for each parameter are given in Table 1). The definitions for assessment of results against the categories, and their indicated colours, are as follows: 

Scoring of pH and Dissolved Oxygen are exceptions to this scoring approach, as they have both upper and lower guideline values and calculations of extent outside are problematic, especially for pH which is measured on a log sale. As such, pH were assessed against the Guidelines as: 

Table 1 - Water Quality Categories used to assess results