Introduction: Polluted Rivers?
Have a discussion with pupils about pollution (see Section 4, Lesson 4.2 “Pollution of surface waters”). Explain to them that, in the same way that the water flow velocity or the type of sediments define living conditions for water creatures, pollution also defines living conditions for animal and plant communities.
Activities in this lesson
Discussion: How to Increase the Quality of Water
- Rivers and streams with low total scores are polluted with organic pollution. What are the sources of pollution? (The levels of phosphorus and nitrate will be high where there is intensive agriculture or sewage pollution.)
- What can be done to reduce pollution? (first: combat the source, i.e. reduce pollution by adapting your behavior; second: fight the effect (end-of-pipe solution), i.e. establishing wastewater treatment plants with updated technology).