Delta Works

The Delta Works (Dutch: Deltawerken) is a series of construction projects in the southwest of the Netherlands to protect a large area of land around the Rhine–Meuse–Scheldt delta from the sea. Constructed between 1954 and 1997, the works consist of dams, sluices, locks, dykes, levees, and storm surge barriers located in the provinces of South Holland and Zeeland.

The aim of the dams, sluices, and storm surge barriers was to shorten the Dutch coastline, thus reducing the number of dikes that had to be raised. Along with the Zuiderzee Works, the Delta Works have been declared one of the Seven Wonders of the Modern World by the American Society of Civil Engineers.

Authorities were aware of the flooding risks in the south of the country, but due to indecision and the Second World War, little action was taken. In 1950 two small estuary mouths, the Brielse Gat near Brielle and the Botlek near Vlaardingen were dammed. After the North Sea flood of 1953, a Delta Works Commission was installed to research the causes and develop measures to prevent such disasters in future. They revised some of the old plans and came up with the "Deltaplan".

An important part of this project was fundamental research to come up with long-term solutions, protecting the Netherlands against future floods. Instead of analysing past floods and building protection sufficient to deal with those, the Delta Works commission pioneered a conceptual framework to use as norm for investment in flood defences.

The framework is called the 'Delta norm'; it includes the following principles:

• Major areas to be protected from flooding are identified. These are called "dike ring areas" because they are protected by a ring of primary sea defences.
• The cost of flooding is assessed using a statistical model involving damage to property, lost production, and a given amount per human life lost.
• For the purpose of this model, a human life is valued at €2.2 million (2008 data).
• The chances of a significant flood within the given area are calculated. This is done using data from a purpose-built flood simulation lab, as well as empirical statistical data regarding water wave properties and distribution. Storm behaviour and spring tide distribution are also taken into account.

The most important "dike ring area" is the South Holland coast region. It is home to four million people, most of whom live below normal sea level. The loss of human life in a catastrophic flood here can be very large because there is typically little warning time with North Sea storms. Comprehensive evacuation is not a realistic option for the Holland coastal region.

The commission initially set the acceptable risk for complete failure of every "dike ring" in the country at 1 in 125,000 years. But, it found that the cost of building to this level of protection could not be supported. It set "acceptable" risks by region as follows:

• North and South Holland (excluding Wieringermeer): 1 per 10,000 years
• Other areas at risk from sea flooding: 1 per 4,000 years
• Transition areas between high land and low land: 1 per 2,000 years

River flooding causes less damage than salt water flooding, which causes long-term damage to agricultural lands. Areas at risk from river flooding were assigned a higher acceptable risk. River flooding also has a longer warning time, producing a lower estimated death toll per event.

• South Holland at risk from river flooding: 1 per 1,250 years
• Other areas at risk from river flooding: 1 per 250 years.

These acceptable risks were enshrined in the Delta Law (Dutch: Deltawet). This required the government to keep risks of catastrophic flooding within these limits and to upgrade defences should new insights into risks require this. The limits have also been incorporated into the new Water Law (Waterwet), effective from 22 December 2009.

The Delta Project (of which the Delta Works are a part) has been designed with these guidelines in mind. All other primary defences have been upgraded to meet the norm. New data elevating the risk assessment on expected sea level rise due to global warming has identified ten 'weak points.' These have been upgraded to meet future demands. The latest upgrades are made under the High Water Protection Program.

During the execution of the works, changes were made in response to public pressure. In the Nieuwe Waterweg, the heightening and the associated widening of the dikes proved very difficult because of public opposition to the planned destruction of important historic buildings to achieve this. The plan was changed to the construction of a storm surge barrier (the Maeslantkering) and dikes were only partly built up.

The Delta Plan originally intended to create a large freshwater lake, the Zeeuwse Meer (Zeeland Lake).^[1] This would have caused major environmental destruction in Oosterschelde, with the total loss of the saltwater ecosystem and, consequently, the harvesting of oysters. Environmentalists and fishermen combined their efforts to prevent the closure; they persuaded parliament to amend the original plan. Instead of completely damming the estuary, the government agreed to build a storm surge barrier. This essentially is a long collection of very large valves that can be closed against storm surges.

The storm surge barrier closes only when the sea-level is expected to rise 3 metres above mean sea level. Under normal conditions, the estuary's mouth is open, and salt water flows in and out with the tide. As a result of the change, the weak dikes along the Oosterschelde needed to be strengthened. Over 200 km of the dike needed new revetments. The connections between the Eastern Scheldt and the neighboring Haringvliet had to be dammed to limit the effect of the salt water. Extra dams and locks were needed at the east part of the Oosterschelde to create a shipping route between the ports of Rotterdam and Antwerp. Since operating the barrier has an effect on the environment, fisheries and the water management system, decisions made on opening or closing the gate are carefully considered. Also the safety of the surrounding dykes are affected by barrier operations.

In an attempt to restore and preserve the natural system surrounded by the dykes and storm-surge barrier, the concept 'building with nature' was introduced in revised Delta Program updates after 2008. The new integrated water management plan not only takes into account protection against flooding, but also covers water quality, leisure industry, economic activities, shipping, environment and nature. Whenever possible, existing engineering constructions would be replaced by more 'nature friendly' options in an attempt to restore natural estuary and tides, while still protecting against flooding.^[2] In addition, building components of the reinforcements are designed in a way that they support formation of entire ecosystems.^[3] As part of the revision, the Room for the River projects, enabled nature to occupy space by lowering or widening the river bed.^[4] In order to establish this, agricultural flood plains are turned into natural parks, excavated farmland is used for wild vegetation and newly excavated lakes and bypasses create habitats for fish and birds.^[5] Along the coast, natural sand is added each year to allow sand to blow freely through the dunes instead of having the dunes held in place by planted vegetation or revetments.^[6] Although the new plan brought along additional cost, it was received favourably.^{[citation needed]} The re-considerations of the Delta Project indicated the growing importance of integrate environmental impact assessments in policy-making.

The Delta Project of which the Delta Works are part of was originally designed in a period of time when environmental awareness and ecological effects of engineering projects were barely taken into consideration.^[7] Although the level of awareness for the environment grew throughout the years, the Delta Project has caused numerous irreversible^{[citation needed]} effects on the environment in the past. Blocking the estuary mouths did reduce the length of dykes that otherwise would have to be built to protect against floods, but it also led to major changes in the water systems. For example, the tides disappeared, which resulted in a less smooth transition from sea water into fresh water. Flora and fauna suffered from this noticeable change.^[8] In addition, rivers experienced an increase in sedimentation by polluted sludge, since there was no longer an open passage to the sea.

The projects of the Delta Plan are financed with the Delta Fund. In 1958, when the Delta law was accepted under the Delta Works Commission, the total costs were estimated at 3.3 billion guilder. This was at that time equal to 20% of national GDP. This amount was spread out over the 25 years that it would take to complete the massive engineering project. The Delta works were mostly financed by the national budget, with a contribution of the Marshall Plan of 400 million guilder. In addition, the Dutch natural gas discovery contributed massively to the finance of the project. At completion in 1997, costs were set on 8.2 billion guilder.^[9] Nevertheless, in 2012 the total costs were already set on^{[clarification needed]} around $13 billion.^[10]

The original plan was completed by the Europoortkering which required the construction of the Maeslantkering in the Nieuwe Waterweg between Maassluis and Hook of Holland and the Hartelkering in the Hartel Canal near Spijkenisse. The works were declared finished after almost forty years in 1997.

Due to climate change and relative sea-level rise, the dikes will eventually have to be made higher and wider. This is a long term uphill battle against the sea. The needed level of flood protection and the resulting costs are a recurring subject of debate, and involve a complicated decision-making process. In 1995 it was agreed in the Delta Plan Large Rivers and Room for the River projects that about 500 kilometres of insufficient dyke revetments were reinforced and replaced along the Oosterschelde and Westerschelde between 1995 and 2015. After 2015, under the High Water Protection Program, additional upgrades are made.^[11]

In September 2008, the Delta Commission presided by politician Cees Veerman advised in a report that the Netherlands would need a massive new building program to strengthen the country's water defenses against the anticipated effects of global warming for the next 190 years. The plans included drawing up worst-case scenarios for evacuations and included more than €100 billion, or $144 billion, in new spending through the year 2100 for measures, such as broadening coastal dunes and strengthening sea and river dikes. The commission said the country must plan for a rise in the North Sea of 1.3 meters by 2100 and 4 meters by 2200.^[12]

The works that are part of the Delta Works are listed in chronological order with their year of completion:

Delta Works

Project	Beginning	Inauguration	Image	Function	Watercourse	Place
Stormvloedkering Hollandse IJssel (Algerakering)	1954	1958		Flood barrier	Hollandse IJssel (river)	South Holland near Krimpen aan den IJssel
Zandkreekdam	1959	1960		Dam	Zandkreek, Veerse Gat (Oosterschelde)	Between Noord-Beveland and Zuid-Beveland in the east
Veerse Gatdam	1960	1961		Dam	Veerse Gat (Oosterschelde)	Between Noord-Beveland and Walcheren in the west
Grevelingendam	1958	1965		Dam	Grevelingenmeer	Between Tholen and Schouwen-Duiveland
Volkerakdam	1957	1969		Dam	Volkerak, Hollands Diep Meuse and Oosterschelde	Between South Holland and Zeeland
Haringvlietdam	1958	1971		Dam / Flood barrier	Haringvliet (Rhine and Meuse)	Between Voorne-Putten and Goeree-Overflakkee
Brouwersdam	1964	1971		Dam	Grevelingenmeer	Between Goeree-Overflakkee and Schouwen-Duiveland
Markiezaatskade	1980	1983		Dam	Scheldt–Rhine Canal, Markiezaatsmeer	Between Zuid-Beveland and Molenplaat
Oosterscheldekering	1960	1986		Flood barrier	Oosterschelde	Between Schouwen-Duiveland and Noord-Beveland
Oesterdam	1979	1987		Dam	Oosterschelde, Scheldt–Rhine Canal	Between Tholen and Zuid-Beveland
Philipsdam	1976	1987		Dam	Oosterschelde	Between Grevelingendam and Sint Philipsland
Bathse spuisluis	1980	1987		Lock	Volkerak, Markiezaatsmeer, Oosterschelde	Bath, Zeeland
Maeslantkering	1988	1997		Flood barrier	Nieuwe Waterweg (Rhine)	Downstream Rotterdam South Holland
Hartelkering	1991	1997		Flood barrier	Hartelkanaal	Near Spijkenisse, South Holland

• Flood control in the Netherlands
• Lauwerszee Works
• Megaproject
• Thames Barrier
• Zuiderzee Works
• Johan van Veen
• Pieter Jacobus Wemelsfelder

• Delta Works.Org / Deltawerken.Com official website for the Delta Works

51°39′N 3°43′E / 51.65°N 3.72°E / 51.65; 3.72