the sluice at lauwersoog in the province of groningen

architecture are barrage border bridge building cleveringlock cleveringsluis cleveringsluizen coast coastline complex connected dams delta dike discharge dutch dyke engineering friesland gate gates groningen holland lake lauwers lauwersmeer lauwersoog lines load lock locks management modern netherlands outdoors plan province road sea sean seawall sluice sluices transportation wadden water waterways which works