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  • Grain-size and infiltration measurements as well as biological and chemical analyses of suspended matter and sediments of a polluted creek show the prime importance of an activated sludge-layer on the infiltration-rate and the clogging of a river
  • In many places water table observations in our days have been affected by human activities even smaller extent (local ground water draft, building project, changes in land use, etc.). Referring to some examples from the Freiburg area it is shown how