Where is the possibility of pollution hiding?

    1. Distribute worksheet among pupils. Study the picture in the worksheet and find out the possible threats for polluting the river.
    2. On a separate sheet of paper write down all the incorrect things you can find. Tell how they can be prevented and what should be done to reduce these problems.
      • If there is no wastewater treatment plant, one should be built. Wastewater should be properly cleaned before it is discharged into a river.
      • Wastewater that originates from unorganized dumps of waste can pollute groundwater and, from there, also watercourses. Well-managed dumping sites are built in such a way that wastewater is captured and properly
      • Barrels with hazardous substances should be kept in special protected places, to avoid leakage into the environment. Or even better, they should be subject to special chemical treatment.
      • Fertilizers and pesticides used in agriculture are washed by rainwater to surface watercourses. Fertilizers cause accelerated growth of aquatic plants (eutrophication), leading to a decline of water quality, while pesticides cause (sub-)lethal effects on organisms.