The European Union (EU) Water Framework Directive (European
Union, 2000) calls for sustainable management of water
resources on a catchment scale (Gilvear et al., 2012). This provides
an impetus to understand the pathways of various pollutants,
which proves to be difficult, when monitoring large catchments.
Some of the more common problems in monitoring have been
identified by Harmancioglu et al. (1999), which include a limited
understanding of the key drivers, difficulties in selecting the