sluice of noordpolderzijl in groningen, holland

1811 architectural architecture building civil connect connecting construction control controlling dangerous door dry dutch engineer engineering europe european floodgate groningen hamlet holland infrastructure lake landmark level lock mirror mirroring natural nature netherlands noordpolder noordpolderzijl outdoor outdoors outside protect protecting pumping railing rising safe safety separate separating sluice station surface technique technology tidal tide water waterlevel watermanagement waterwork waterworks weir wet zijl