Scope and aims in model techniques, instrumental aids for hydraulic model studies,investigations of structures for flow control, river studies, model investigations on local scour, problems connected with flows due to differences in density, from Spaarndam to Veersche Gat, hydraulic refinement of engineering structures, wave action on structures, the collecting of field data, navigation in small-scale models, the use of digital computers in hydraulic research, developments in model investigations of coasts and harbours.