monument near dutch sluice dokkumer nieuwe zijlen

architectural architecture arms ball balls bridge building canal civil coat complex connect connecting construction control controlling decorated decoration dokkumer dokkumerdiep drainage dutch engineer engineering europe european flag flags floodgate friesland frisian gilded grootdiep holland honor info information infrastructure landmark lauwersmeer level lock memorial monument natural nature needle netherlands new nieuwe obelisk outdoor outdoors outside pedestal protect protecting rising river safe safety separate separating sluice sluices surface technique technology tidal tide water waterlevel watermanagement waterwork waterworks weir wet zijlen