Numerous stream restoration projects have been carried out in the past decades. In many cases, these were mostly aiming at the reconstruction of the geomorphology of the stream. Examples are the construction of meanders and narrowing of the stream profile. Much less attention was paid to the restoration of stream functioning, e.g. erosion and sedimentation, more natural flooding patterns, habitat heterogeneity and the enhancement of habitat connectivity in the stream valley. This symposium will focus on restoration of stream ecosystem functioning and the associated enhancement of the diversity of stream biota.