obelisk near sluice of dokkumer nieuwe zijlen, holland

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