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Physical Appearance

The «Physical appearance» module is part of the Modular Stepwise Procedure, which was developed to facilitate standardized investigation and assessment of the state of watercourses in Switzerland.

This module is used to investigate the following parameters: sludge, turbidity, discoloration, scum, odour, iron sulphide, colmation (increased concentration of suspended particles in the pore volumes of the stream bed), solid wastes, heterotrophic organisms and vegetation. The objective is to assess watercourses at the regional level. The findings are evaluated using a three-point scale, and possible causes are assessed. No overall evaluation of physical appearance is undertaken: the parameters are assessed individually and can be represented in a large-scale map

 

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Severe foaming, Photo: GBL, Canton BE

 
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