By Aquaflow

Aquaflow WT Kolk stows more water at low cost

Stow more water at low cost

Heavy rainfall?

Street flooding that occurred during Hurricanes could become more common in the decades ahead. This Aquaflow solution helps cities keeping the streets dry.

In the first statewide climate change outlook for New York, scientists say that the state may suffer disproportionate effects in coming decades compared with other regions, due to its geography and geology.

The report paints a harsh picture, including possible extreme temperature and sea-level rises, downpours, droughts and floods. The changes are projected to affect nearly every region and facet of the economy by the 2080s, from ski resorts and dairy farms to New York City’s subways, streets and businesses.

Stow more water at low cost

This water stow solution avoids the overflow of the streets in your city.

Aquaflow WT kolk video

Global warming is not evenly distributed; because of its northerly latitude, New York has already warmed 2.4 degrees Fahrenheit in the last 40 years. More than twice the global average. The report projects a further 1.5 to 3-degree rise by the 2020s; 3 to 5.5 degrees by the 2050s; and 4 to 9 degrees by the 2080s. Winters will be milder, and summers will see more extreme heat waves and droughts, say the researchers.

figures & facts WT kolk


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By Dutch Delta Works

Maesland barrier Rotterdam keeps the water outside

water barrier, floods, climate change, sustainable, infra, green city

The colossal barrier is almost as long as the Eiffel Tower

Virtual tour of the Maeslant Barrier in the New Waterway, near Rotterdam. Opened on May 10th 1997 by Queen Beatrix, the barrier consists of two large hollow steel doors. Under normal conditions the doors are open, concealed within docks on each side of the waterway. This allows unhindered access for shipping traffic into the port of Rotterdam.

When the water level rises to 3 meters above Amsterdam ordnance zero, the docks are flooded and the doors begin to float. They are driven into the waterway and then flooded, thus sinking and sealing off the 360 meters wide waterway.

Construction of the Maeslant Barrier

The construction of the barrier started in 1991. First the dry docks were constructed on both shores and a sill was constructed at the bottom of the Nieuwe Waterweg. Then the two 22-meter high and 210- meter long steel gates were built. After this, 237-meter long steel trusses were welded to the gates.

Standing upright, these arms would be as high as the Eiffel Tower, and each one weighs almost as much at 6,800 tonnes.

The main purpose of the arms is transmitting the immense forces, exerted on the gates while closed, to one single joint at the rear of each gate. During the closing or opening process, this ball shaped joint gives the gate the opportunity to move freely under the influences of water, wind and waves.

Ball-shaped joint

It acts like a ball and socket joint, such as in the human shoulder or hip. The joints were made in the Czech republic at Škoda Works. The ball-shaped joint is the largest in the world, with a diameter of 10 meters, and weighing 680 tonnes.

The construction of the barrier costed 450 million euro. The total Europoortkering-project had cost 660 million euros.


Facts & Figures


 

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By Heinz Munz

EKO Flood System

Eko Flood System

Eko Flood System is a HY-FLO Self Closing Flood Barrier passive system

EKO Flood USA offers comprehensive flood control systems to help protect communities, businesses and cities from major flood disasters.

Flooding can cause enormous damage to homes, businesses and even entire cities. EKO Flood USA offers a complete flood protection solution designed specifically for your community from extensive research to planning and analysis.

Our flood protection solution may include our removable flood walls, levees, and low barrier retaining walls.

Flood System

From extensive research to planning and analysis. Our flood protection may include our removable flood walls, levees, and low barrier retaining walls.

FAST SETUP TIME

A 30 worker team manages:

  • 1.7 sq ft per second
  • 100 sq ft in 2.8 minutes
  • 2,125 sq ft in an hour

facts & figures


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By BAM Infraconsult / Delta Marine Consultants

BoxBarrier uses water against water

Super 'Lego" boxes: the BoxBarrier prevents against flooding

Super ‘Lego” boxes: the BoxBarrier prevents against flooding

The BoxBarrier is a very effective temporary flood defense system, which can be used to temporarily heighten the crest of a dike, or to make a temporary dam on flat terrain. This increased  crest height prevents flooding of the areas behind the dike.

The concept of the BoxBarrier flood barrier is characterized by easiness, because it makes use of its opponent: it retains water with water.

BoxBarrier modular system

The modular flood defense consists of box elements, which are connected by joint elements. The box elements are covered by lids. The box elements are filled by a pump and then the BoxBarrier is ready for all types of floods!


figures & facts BoxBarrier


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By Wim Sondagh

SLAMdam: easy movable dam

Water, flooding, contamination, climate change, green city, sustainable

Also, the SlamDam can be used for creating a bassin for reception of contaminated firefighting water

The revolutionary Dutch invention SLAMdam is an innovative flood barrier that can be placed simply by only two people. And after that you just roll it back to manageable size. A big step forward in safety of your life and home when the water is rising.

No more sandbags at your door! No danger of water, very hard work and days of time. Instead you build this SLAMdam in half an hour. Much easier and faster! The SLAMdam® can be used as

  • a floodbarrier
  • a bassin
    for example holding chemicals together

Certificated

Length and shape of the dam are unlimited because SlamDam parts to attach easily to each other.

  • The SLAMdam has been extensively tested scientifically during the development, including in the experimental fields at the Technical University in Delft – the Netherlands.
  • It has the global safety certification TÜV PAS1188-2: 2009 which is a recognition of the reliability and safety.
  • Thanks to the high-quality material, SlamDam has a warranty of ten years on the material.

facts & figures SLAMdam 


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By BAM Infraconsult / Delta Marine Consultants

With Ecobeach tubes Dutch beaches grow significant

bam ecobeach

Ecobeach sand supply on the beach

Ecobeach saves billions of euro’s.

Annually the Netherlands sand supply about twelve million cubic meters to maintain the coastline.

This costs the society millions of euro’s, and this will only increase in the future.

Ecobeach is a positive tested alternative. In four years in test areas at Egmond at Sea, the tubes proved a beach grow by 150,000 cubic meters of sand.

Ecobeach

Ecobeach tubes ensures natural silting making the beach wider and drier. In test sections in the longitudinal direction for approximately 100 meters installed 10 vertical drainage pipes in the sea direction about 10 meters apart. These tubes remain about 25 inches below the surface.

Highest level ever

The trial started in October 2006 and lasted four years. In total there are more than 600 drainage tubes. In late February 2011, the drainage tubes removed and showed the amount of sand on the beach at the highest level ever recorded. (In 1965, the annual coastal measurements started).

 


 

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By BAM Infraconsult / Delta Marine Consultants

Balgstuw barrier Ramspol

balgstuw Ramspool

Storm barrier Ramspol protects Holland again

Due to persisting winds with forces eight to nine Beaufort on Jan 06, 2012 it was decided to inflate the storm surge barrier at Ramspol. 

The process was started shortly midnight. It took about one hour before the enormous barrier was fully inflated thus protecting the Ramspol-diep for high water in the Dutch IJsselmeer.

April 2015, the barrier had to be closed for hours because of the storm.Closing ‘the gate’ was very successful.

3 inflatable dams

During recent weeks in the major rivers changed from extremely low to very high everal had been flooded. The rapidly rising water level were caused by continuous rainfall especially in the German basin and saturated land, preventing rainwater penetrate into the soil. The barrier consists of three inflatable, nylon-reinforced rubber dams, each 75 m long, 13 m wide and with a design height of 8.35 m. They are the largest dams of their kind ever built. The dam is inflated with air while a gravity-feed system allows water to flow in. The barrier is lowered again by pumping out the water and letting out the air.

The storm surge barrier near Ramspol, designed and built by the Royal BAM Group nv, was built to project the hinterland against flooding by high water from the IJsselmeer lake. It was commissioned end 2002.


facts & figures Balgstuw barrier Ramspol


 

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By BAM Infraconsult / Delta Marine Consultants

XBlocs prevent harbours

xblocksXBlocs are the most economical single layer armor unit. The average concrete saving yielded by incorporation of Xbloc units is up to 15% compared to other single layer armor units.

Casting and placing the Xbloc unit is straightforward and is very cost effective. Xbloc has been applied on shore protections and breakwaters all over the world already for a decade and has proven to perform outstanding.

XBlocs eco and safety

In addition Xbloc has proven to be very ecofriendly as the random structure and high porosity of an Xbloc armour layer provide a good habitat for different kinds of marine vegetation and animals.

  • Xbloc continues to be innovative as the toe unit Xbase and Eco Xbloc show.
  • The special toe unit Xbase has been developed for use with Xbloc armour.
  • On the Eco Xbloc the concrete surface texture can be adjusted to stimulate marine growth and improve the ecological value of the armour unit.

Excellent hydraulic stability

  • For concept design a Kd value [stability coefficient in the Hudson formula] of 16 [trunk section] and 13 [head section] should be applied;
  • The stability coefficient of the Xbloc is the same for breaking and non-breaking waves;
  • Xbloc has a safety margin of at least 20 % without damage to the armour layer. See also: Hydraulic Performance of Xbloc Armour Units.

Automatic interlocking

  • Xbloc units naturally find a stable position on the slope;
  • Self repairing of the Xbloc armour layer after damage is enhanced by automatic interlocking;
  • The Xbloc unit is simple to place, due to the straightforward placement principle.

Low wave overtopping

  • The highly porous armour layer minimizes wave overtopping. For more information see: CLASH test results: Overtopping performance of different armour units for rubble mound breakwaters;
  • For guidance on overtopping coefficients see: Overtopping and Wave reflection.

Low wave reflection

  • The highly porous armour layer minimizes wave reflection:
    Wave reflection from coastal structures by B. Zanuttigh and J.W. van der Meer;
  • For guidance on reflection coefficients see: Overtopping and Wave reflection.

Outstanding structural integrity

The structural integrity of the Xbloc was evaluated by using:

  • Prototype drop tests [The Netherlands, Georgia, Ireland and U.A.E.];
  • Finite element calculations.

 

facts & figures Xbloc


 

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By Dutch Delta Works

Delta Works keep Holland dry

Delta Works keep Holland dry

60% of the Dutch are living below sea level

The Delta Works 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. Needed because 60% of the Dutch live below sea level

The works consist of damssluiceslocksdykeslevees, and storm surge barriers. 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, Delta Works have been declared one of the Seven Wonders of the Modern World by the American Society of Civil Engineers.

Video

Delta plan to prevent because of the rising of the sea level – climate change

In September 2008, the Delta commission presided by Dutch 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.

Floods

Water has always played a central part in Dutch history. On one hand it brought wealth to the Netherlands through trade and fishery; on the other hand it brought a number of losses through the many floods. To date water has remained important for the Netherlands. From a geographical point of view, the Netherlands are placed in a very favorable position; at the sea and in the delta (a triangular section of land at the mouth of a river) of four large rivers.

Drained area’s

The Dutch surface area has almost doubled through centuries of “poldering” (area drained and prepared for agriculture) lakes and parts of the sea. As a result of this poldering almost 40 percent of the land lies below sea level. Areas include large parts of the highly populated and the economically important west, with cities such as Amsterdam and Rotterdam. To keep these areas dry, superfluous water is continuously pumped out of the polders. Furthermore, the Netherlands is protected from floods through a combination of levees, dunes, dams and barriers.  After the last big flood of 1953, people decided to build the Delta Works; one of the largest built flood protection and water management projects in the world.

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By The Sand Motor

SandMotor: Flood protection with nature

SandMotor protects Dutch Coast

The SandMotor project can be regarded as a ‘field laboratory’ of physical and institutional learning and an innovation for mainstream flood protection.

The SandMotor protects the Dutch coast and creates an additional 128 ha of space for nature and recreation.

Every year, the sea takes sand from the Dutch coast. Every five years, Rijkswaterstaat replenishes the shortfall by depositing sand on the beaches and in the offshore area. If we didn’t, the west of the Netherlands, which is below sea level, would be exposed to the sea.

By building the Sand Motor, a peninsula on the Dutch coast, we try to find out whether nature can spread sand along the coast for us. It goes without saying that the Dutch government is not experimenting with the safety of its people: the coastal defenses are at maximum strength now the Sand Motor has done its job.

Besides coast protection, the project creates an additional 128 ha of space for nature and recreation.

Flood protection

In flood protection, the dominant paradigm of ‘building hard structures’ is being challenged by approaches that integrate ecosystem dynamics and are ‘nature-based’. Knowledge development and policy ambitions on greening flood protection (GFP) are rapidly growing, but a deficit remains in actual full-scale implementation.

The SandMotor is a large-scale (21.5 Mm3) sand nourishment project. This project confirms that an integrated knowledge arrangement enables GFP as it allows for multi-functionality. Effectiveness of the integrated arrangement in this project is explained by its ‘flexible’ nature providing ample design space. This was possible because core values in flood protection and nature were not part of the integrated arrangement.

Construction

Between March 2011 and November 2011, Rijkswaterstaat and the provincial authority of Zuid-Holland created the hook-shaped peninsula. It extends 1 km into the sea and is 2 km wide where it joins the shore.

Trailing suction hopper dredgers picked up the sand ten kilometers off the coast and took it to the right place. Two offshore replenishment locations alongside the peninsula are also part of the Sand Motor. The SandMotor project can be regarded as a ‘field laboratory’ of physical and institutional learning and an innovation for mainstream flood protection.

link to Involved dredging company VanOord

By Dutch Delta Works

Dutch Water Management

Dutch Water Management, rivers need space

Dutch Water Management, rivers need space

Dutch Water Management is known for it’s extensive knowledge and experience in the planning and protection of  vulnerable areas.

The Dutch Delta is broad and ranges from hydraulic engineering and dikes to management, water supply, spatial planning and the food supply chain, energy, industry, housing and recreation. Rivers need space! 

The Dutch help to prevent more casualties.

Dutch – US alliance

The Dutch-U.S. alliance helps safeguard both countries from water-related crises, including floods and coastal degradation, and allows effective responses when the worst crises cannot be prevented.

Our partnership proved vital after Hurricane Katrina, when the Netherlands provided immediate and long-term assistance to the Gulf Coast, and after Hurricane Sandy hit New York and New Jersey.

More frequent flash floods

Although there is as yet no proof that the extreme flood events of recent years are a direct consequence of climate change, they may give an indication of what can be expected: the frequency and intensity of floods in large parts of Europe is projected to increase. In particular, flash and urban floods, triggered by local intense precipitation events, are likely to be more frequent.

Reduction spring snowmelt floods

In snow‑dominated regions such as the Alps, the Carpathian Mountains and northern parts of Europe, spring snowmelt floods are projected to decrease due to a shorter snow season and less snow accumulation in warmer winters. Earlier snowmelt and reduced summer precipitation will reduce river flows in summer, when demand is typically highest.

For the period 2071-2100 the general feature is a decrease of extreme flows in areas where snowmelt floods are dominating in the present climate. The hundred year floods will attenuate by 10-50% in northern Russia, Finland and most mountainous catchments throughout Europe. An increase by similar amount is projected in large areas elsewhere, whereas a mixed pattern is likely in Sweden, Germany and the Iberian Peninsula.

Increase flood losses

Losses from river flood disasters in Europe have worsened in recent years and climate change is expected to exacerbate this trend. The PESETA study, for example, estimates that by the 2080s, some 250-400 million Europeans could be affected each year (compared with 200 million in the period between 1961 and 1990). At the same time, annual losses due to river flooding in Europe could rise to €8-15 billion by the end of the century compared with an average of €6 billion today (21).

Large differences across Europe

Annual river flow is projected to decrease in southern and south-eastern Europe and increase in northern and north-eastern Europe (19).

Strong changes are also projected in the seasonality of river flows, with large differences across Europe. Winter and spring river flows are projected to increase in most parts of Europe, except for the most southern and south-eastern regions. In summer and autumn, river flows are projected to decrease in most of Europe, except for northern and north-eastern regions where autumn flows are projected to increase (20). Predicted reductions in summer flow are greatest for southern and south-eastern Europe, in line with the predicted increase in the frequency and severity of drought in this region.

Climate-related changes in flood frequency are complex and dependent on the flood generating mechanism (e.g. heavy rainfall vs spring snowmelt), affected in different ways by climate change. Hence, in the regions where floods can be caused by several possible mechanisms, the net effect of climate change on flood risk is not trivial and a general and ubiquitously valid, flat-rate statement on change in flood risk cannot be made (22).

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