Classification of coastal waters

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Assessment made on 17 Oct 2003

Note: new version is available!

Mar 26, 2013 - Chlorophyll in transitional, coastal and marine waters (CSI 023) - Assessment published Mar 2013
Jul 06, 2011 - Chlorophyll in transitional, coastal and marine waters (CSI 023) - Assessment published Jul 2011
Jan 29, 2009 - Chlorophyll in transitional, coastal and marine waters (CSI 023) - Assessment published Jan 2009
Nov 29, 2005 - Chlorophyll in transitional, coastal and marine waters (CSI 023) - Assessment published Nov 2005
Jul 27, 2004 - Classification of coastal waters
Jul 27, 2004 - Chlorophyll-a concentrations in transitional, coastal and marine waters
Jul 27, 2004 - Phytoplankton algae in transitional and coastal waters

Generic metadata

Classification

Water (Primary theme)

Coasts and seas

DPSIR: State

Identification

Indicator codes

WEC 2d

Geographical coverage:

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Contents

Policy issue: Is good surface water ecological status being achieved and the deterioration of aquatic ecosystems and habitats prevented?

Key messages

The majority of transitional and coastal waters are of good quality in the two countries used to test this demonstration indicator.

Figures

General classification of Finnish coastal waters based on water quality data

Classification of estuaries in Scotland

Classification of estuaries in England and Wales

Key assessment

There are far fewer national classification schemes for transitional and coastal waters than there are for rivers. Those that are used are often based on a combination of chemical, biological and aesthetic measures.

The quality of estuaries in England and Wales showed little improvement between 1985 and 1995 (Figure 2.6). However between 1995 and 2000, the proportion of good quality estuaries increased and the proportion of poor and bad decreased reflecting the improvement measures introduced under the urban waste water treatment and bathing waters directives. The quality of estuaries in Scotland remained relatively constant between 1996 and 1999 (Figure 2.7).

Figure 2.8 shows the general classification of Finnish coastal waters based on water quality data from 1994 to 1997. The results indicate that only 12 % of their waters are considered to be of less than good quality. The poorer quality waters are generally because of eutrophication, hazardous substances or hygienic bacteria. Thus, for example, coastal waters close to large municipalities such as Helsinki were often classified as poor or passable.