Self-purification processes along a polluted river in Greece

The Louros river, Greece, flowed into the Amvrakikos gulf, an important fishery area. The flood plain of the river was intensively cultivated, and sources of pollution included pesticides, fertilizers, animal wastes, and domestic sewage. In addition, drainage works accelerated run-off, and irrigation and flood control measures also changed the water regime. A map of the area showing sources of waste water is included and results are summarized from a study on the physico-chemical condition of the river water and the aquatic organisms present. The river had average self-purifying properties which were affected by weather conditions and agricultural activities.