THE INFLUENCE OF BIOREGULATION ON WATER-QUALITY OF THE PREFILTERED STAGNANT WATER RESERVOIR EEKHOVEN (FLANDERS, BELGIUM)

When the creation of a new safety reservoir for the drinking water sup ply of the Antwerp region was envisaged it was decided that a number o f actions would be undertaken to create a favourable environment for b ioregulation (biomanipulation). These were: the use of boulders for th e side-walls instead of concrete or bitumen, first flooding with a sha llow layer of water to leach out the minerals contained in the upper c lay layer of the bottom floor, introduction of freshwater mussels and of a number of fish species (bitterlings, predators such as eels, pike -perch and pike) and of submerged, floating-leaved and emergent aquati c plant species. This paper is a report on the results of these bioreg ulation measures obtained so far. (C) 1998 IAWQ. Published by Elsevier Science Ltd.