Maeslantkering

E15706

civil engineering structure movable flood barrier storm surge barrier

Maeslantkering is a massive movable storm surge barrier in the Netherlands that protects the low-lying Rotterdam region from North Sea flooding.

Predicate	Object
instanceOf	civil engineering structure → movable flood barrier → storm surge barrier →
clearanceBelow	about 17 m when open →
closureFrequency	a few times per decade →
closureThreshold	3.0 m above NAP at Rotterdam →
constructionStartDate	1991 →
controlSystem	BOS computer system → fully automated →
coordinates	51.955°N 4.122°E →
country	Netherlands →
designedBy	HBG Civiel → Hollandse Beton Groep → Rijkswaterstaat →
designedForWaterLevel	3.0 m above NAP →
designedReturnPeriod	1 in 10,000 years storm surge →
gateWeight	6800 tonnes per gate →
hasPart	two ball-and-socket joints → two floating sector gates → two retaining walls →
hasVisitorCenter	Keringhuis →
height	about 22 m above waterline →
inaugurationDate	1997 →
length	240 m per gate →
locatedAtMouthOf	Nieuwe Maas →
locatedIn	Rotterdam–The Hague metropolitan area → South Holland →
locatedNear	Hoek van Holland → Maassluis NERFINISHED →
locatedOn	Nieuwe Waterweg →
material	concrete → steel →
namedAfter	Maeslant (Maas estuary) →
notableFor	largest ball-and-socket joints in the world → one of the largest moving structures on Earth →
opened	1997-05-10 →
operator	Rijkswaterstaat →
partOf	Delta Works →
projectName	Europoortkering →
protects	Port of Rotterdam → Rhine–Meuse–Scheldt delta → Rotterdam →
purpose	flood protection for Rotterdam region → protection against North Sea storm surges →
span	360 m opening →
testClosureFrequency	once per year →
touristAttraction	yes →

Subject (surface form when different)	Predicate
Rhine–Meuse–Scheldt delta →	hasFloodProtectionStructure
Delta Works →	hasPart
Nieuwe Waterweg →	hasStructure