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Groenedijk Monument

Historic sites in the Netherlands

The Groenedijk Monument, also known as the Dukdalf, is a monument in Capelle aan den IJssel that serves as a memorial for the events that took place in 1574 related to the Eighty Years' War, also known as the Dutch Revolt. During the conflict, William the Silent ordered the destruction of several dykes to stop the Spaniards who were surrounding the Dutch city of Leiden. The tactic proved to be successful, as the Spanish troops were greatly affected by the incoming water, which took them by surprise. The Spanish troops lost their mobility, whereas the troops mustered by William the Silent had prepared for the water using small ships. With the help of the controlled destruction of dykes in four strategic locations, the city could be freed with the help of the Sea Beggars, better known as the Geuzen. The people in Leiden, who had been starving for months, could now be fed with herring, which became a Dutch tradition to remember the Siege of Leiden.

Excerpt from the Wikipedia article Groenedijk Monument (License: CC BY-SA 3.0, Authors).

Groenedijk Monument
Rinus Terlouwpad,

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Latitude Longitude
N 51.926829 ° E 4.607682 °
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Dukdalf

Rinus Terlouwpad
2924 AX
South Holland, Netherlands
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Stormvloedkering Hollandse IJssel
Stormvloedkering Hollandse IJssel

The Stormvloedkering Hollandse IJssel (English: Hollandse IJssel Storm Surge Barrier), Hollandse IJsselkering (Hollandse IJssel Barrier) or Algerakering (Algera Barrier) is a storm surge barrier located on the Hollandse IJssel, at the municipal boundary of Capelle aan den IJssel and Krimpen aan den IJssel, east of Rotterdam in The Netherlands. The construction of the works comprised the first project of the Delta Works, undertaken in response to the disastrous effects of the North Sea flood of 1953. Prior to 1954, the spelling Hollandsche was used in the official name. The Hollandse IJssel is a low-lying river, and during the 1953 flood, the river dikes were exposed to dangerously high water levels, placing around 1.5 million people in the Randstad at risk from flooding. A dike at Ouderkerk aan den IJssel failed, and a dike in Nieuwerkerk aan den IJssel was almost breached, being sealed only after the local mayor ordered sailor Arie Evegroen to navigate his barge Twee Gebroeders into the hole which had been formed in it. The body in charge of the Delta Works, the Deltacommissie, therefore prioritised the construction of a storm surge barrier, and in January 1954, less than a year after the flood, dredging works were undertaken to start the project.On May 6, 1958, the first sluice gate was lowered as a test, with the storm surge barrier made operational on 22 October 1958. The barrier is often referred to colloquially as the Algerakering, but has never been officially known by that name. The name arises as the adjacent bridge carrying the N210 road is officially named the Algerabrug (Algera Bridge), after Jacob Algera, who resigned as Minister of Transport and Water Management for health reasons on 10 October 1958, only twelve days before the opening of the project. The architect was J.A.G. van der Steur Jr., and the project was designed by the Deltadienst department of Rijkswaterstaat, with H.G. Kroon as construction engineer.The barrier is classified as a Rijksmonument. The four towers of the barrier are lit to act as aids to navigation, with blue lighting indicating an open barrier and red lighting indicating that the barrier is closed.