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Berlin Environmental Atlas

02.03 Biological Water Quality (Trophics) (Edition 2004)

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Methodology

The assignment of the Berlin watercourse segments to quality classes was carried out on the basis of the LAWA proposal on Quality Classification of Dammed Plankton-Dominated Streams (LAWA 1996), on the basis of the mean chlorophyll-a content (biomass equivalent) for the testing period May through October of the years 1993 to 1995, 1995 to 1997, 1997 to 1999, 1999 to 2001 and 2001 to 2003. The canals north and southern of the Spree were excluded from the assessment.

Tab. 2: Quality classification based on chlorophyll-a contents and expected overall phosphorus concentrations and view depths
Class Chlorophyll-a
mean average value
µg / l
Overall phosphorus
mean average value
mg / l
View depth
mean average value
m
Class I I 1 - 4 - 4.6 - 6.0
Class I-II I - II 3 - 8 0.006 - 0.018 3.5 - 5.0
Class II II (target) 7 - 30 0.016 - 0.082 1.5 - 3.7
Class II-III II - III 25 - 50 0.067 - 0.150 1.0 - 1.7
Class III III 50 - 100 0.150 - 0.320 0.5 - 1.0
Class III-IV III - IV > 100 >0.320 < 0.5
Class IV IV not defined - -
Tab. 2: Quality classification based on chlorophyll-a contents and expected overall phosphorus concentrations and view depths

The measured maximum, minimum and mean average values of the respective examination time periods with the curve lines for chlorophyll-a values, overall phosphorus, view depths, and algae proportions shown in the pie charts can by obtained by clicking on the respective measurement points in a separate window (mark the function "Show Data" in the menu below the map, and click on the map).
There is no data attainable through the colored strips for the quality classes.

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