Thursday , September 24 2020

High Water, Here's How the Mobile Partitions Work in Rotterdam: "The Moses Model Rejected for Expensive Maintenance"



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Difficult to handle floods on the territory of 40% below sea level. Like thatNetherlands his bills made them all okay. He had to do it after the big one floods arrived from North Sea in 1953, caused by a deadly mixture of high Prussian tides with a strong cyclone: 1,836 deaths only in the Netherlands, especially in the Netherlands Zealand. The current has been pushing water for more than thirty hours, making the dams already insufficient. Today, with the huge problem of Venice under water and Nose knot far from putting everyone in line, it is equally difficult not to do comparisons with what they did in the Netherlands, well before that in Italy i work of the work to be defended by Serenissima. And it's no coincidence that, when looking for alternatives to Moshe, it's exactly in the Netherlands he looked at himself. Because if it's true that the Netherlands export their own solutions anti flood worldwide, with 7 billion annual turnover (and therefore the bills have done well), it is not certain that these enough in the protracted war against the sea and climate change that continues to mount the level of the oceans.

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DELTA CAT – However, a few months after the 1953 disaster, there was no other solution: to close the last open sea offenses, they were used four concrete boxes positioned between the beach and the water, whose construction was studied during World War II, to build artificial ports. Today it is only in those sprinkler debris Phoenix based on Watertown Museum, in Overwerk, built for commemorate victims, but also – as stated at the entrance – "to remember, learn and look to the future. " Between 1954 and 1997 mega-project on Delta plan, the largest sea protection system that exists in the world and which protects the mouth area of ​​the Rhine, Meuse and Felt. The plan consists of Hydraulic works 13 different: three locks, four storm barriers and six dams. The most complicated thing is of course the East Shell dam (Oosterscheldekering), with a barrier of nine kilometers that protects Amsterdam. Price of the project 2.5 billion euros, two-thirds of the cost of the whole plan. The other fundamental thing is dam barrage anti – impulsive Rotterdam (Maeslantkering), completed in 1997.

THE OTHER ALTERNATIVE TO THE MIDDLE – So much so that in the summer of 2001, the architect Fernando De Simonerepresentative in Italy of Dutch groups Tec and Norwegian Nordcosult, presented to the then mayor of Venice Paolo Costa just a rough draft of Rotterdam-style dams: always movable partitions, but it differs from Moss especially because they have mechanical devices that move them not to rest on the seabed, but on dry, in underground galleries on the sides of the three mouths of the port. The project, De Simon recalled, would have a total cost of approx one billion and 200 million (400m for each port) and could see the light five years. Two years later, in February 2003, as Moshe's final "yes" continued to slip, architect De Simone put forward the proposal. And again, in November 2006, the then ministers of infrastructure Antonio Di Pietro and the environment Alfonso Pecoraro Sciano they were even invited "to visit the Rotterdam Dam before the final decision on the Mosse" directly from Tec. “The Rotterdam Dam Project is working perfect was elected for more than seven years after analyzing numerous alternative projects, including the Moshe project, "explained architect De Simone on that occasion. That 13 years ago he told how, beside the Rotterdam dam, there was a small museum where I was rejected projects by the Dutch, including one similar to Moshe's "Off because it's under consideration dangerous and why he would predict maintenance expensive".

HOW THE WORKING LABOR SYSTEM WORKS on Maxi Dam Protecting From the Storm The Dutch port of Rotterdam was operated for the first time in November 2007 to avoid floods pending the arrival of storms in the North Sea. The dam aims to close it channel Nieuwe Waterweg, which connects Rotterdam with the North Sea when the sea reaches the critical threshold. The dam is formed by two input ports in the form of a bow 210 m long and 22 m high, build with 15 thousand tons on steel, twice as much as needed for the Eiffel Tower. Both doors work, thanks to two metal levers 250 meters long, by a automated system which is activated when the water level rises. The build was designed to withstand weight from 30 thousand tons during the pressure caused by the storm. On the other hand, the East Felt Dam was formed 65 pylons and Sliding compartments 6 to 12 meters high, climbing up and down and closed on average once a year (it takes 75 minutes to fully tighten them), that's when water levels of three meters are expected to rise above what is considered normal. It was originally planned to close the dam, but was later resolved semi-open work, listening to what they asked environmentalists, but me too fishermen concerned about the level of salinity and the risk of extinction of marine flora and fauna.

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DELTA DEBATE – The debate, however, is far from closed. The deeds carried out in the Netherlands are 25 kilometers long and have reduced the Dutch coast to about 700 kilometers. It is true that Osterskerkering is considered by some to beeighth miracle of the world, while in recent years Rotterdam has found more and more solutions green to solve the problem of rising sea, but in Venicevisual impact of these barriers would be definitely different and still what we are looking forinvisibility. But there is another aspect. Probably without the Delta Plan, the Netherlands would be a huge swamp, but the dams built since the fifties are not one final solution due to several factors, such as climate changes and global warming continues to rise as the land and oceans plummet. They will go strengthened and increased. Suffice it to say that ten years ago, in a report presented by the Delta Commission to the Hague Government, it was calculated that in order to prevent future catastrophes and given estimates of sea level rise, the Netherlands would have to move between 1.2 and 1.6 billion euros per year to 2050 for construction of new dams, reinforcement with tons of sand on the North Sea coast and the construction of different channels.


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