Projections are that Rotterdam, one of the worlds' largest harbours, will be in need of 1250 hectares of additional harbour area within the next 15 years. To meet this demand a substantial land reclamation ("Maasvlakte-2") is considered, which could provide 1000 hectares of new harbour areas and 750 hectares for nature and recreation. In addition, just north of the Rotterdam harbour area a land reclamation is considered to relieve the urban development of The Hague ("Nieuw Holland"). Delft Hydraulics was commissioned to investigate the morphological impacts of four land reclamation ahematives and associated sand mining scenarios. The area of impact investigated extended approximately 25 kilometres north and south of the planned land reclamation and some 50 kilometres seaward.