Etude physico-chimique, bactériologique et biologique d'une rivière franco-suisse: La Drize

Abstract

Drize is a highly polluted river, the pollution being essentially due to the disposal of water from a waste water treatment plant situated in Collonges-sous-Salève. In addition, water run off from agricultural land and accidental introduction of chemicals contribute to this pollution. The benthic macrofauna of its basin is found to be very poor. The Collonges-sous-Salève waste water treatment plant has been linked to the Geneva water treatment network since november 1990. Although some decrease in pollution of the river Drize has been observed, it still belongs to the highly polluted class of water.