landscape of borgharen dam and lock complex, hydraulic works to regulate river maas

architecture barrier blocking borgharen bridge building canal complex concept concrete dam dike downstream dutch dyke energy engineering environment europe flood floodgate flowing gate gates gateway holland hydraulic industry landscape levees limburg lock maas meuse middle nature netherlands passage pillar power protect regulate reservoir rill river rural scenic sluice south spillway spring steel stream system top tower towers water watercourse waterfall watergate waterway waterworks weir working works